AddActionListener() help
I was wondering if there's any way I could have particular JFrame elements like buttons, checkboxes, etc utilize the ActionListener without creating an object of that class? I have all my GUI code in a user defined function, that I then call the function in main, but I can't get the statement...
okButton.addActionListener(this);to compile. It complains about referencing a non-static variable in a static context. okButton is defined as a static type and so is the function it's contained in. I know 'this' refers to the object, but I don't want to create an object of the class. I can't use null because then it's not listening even though it compiles.
Any help is greatly appreciated!
You do need to create an object implementing ActionListener, but it shouldn't be the class your code is in.
Of course, usually you define an class which extends JFrame or the build the components like buttons etc. in there, typically in the constructor. You certainly need an instance of the JFrame.
Typically you use anonymous classes for simple listeners.
Something like:
myButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
... action code here
});It's considered rather bad style to have classes implement interfaces which aren't related to their primary purpose.
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public class Gas extends JFrame
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i have something like this:
import java.awt.*;
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System.exit(0);
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appObj.setWidth(width);
appObj.setHeight(height);
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appObj.start();
appWindow.getContentPane().add(appObj);
appWindow.setSize(width, height);
appWindow.show();
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private class ButtonHandler implements ActionListener{
public void actionPerformed(ActionEvent e){
for(int i=0; i<choices.length; i++){
if(e.getSource()==choices[i]){
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width=(w>=0 ? w : 100);
height=(h>=0 ? h : 100);
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}I also need to put delays between method calls but I need to synchronize them. Am I doing it all wrong? The application pauses or sleeps but afterwards, it still drew everything all at once. Thanks a lot!It is. Sorry about that. Just answer any if you want to. I'd appreciate your help. Sorry again if it caused you anything or whatever. .n_n.
-
Need Help to Draw and Drag Triangle - URGENT
Hi everyone - I am developing various proofs of the pythagora's theorem
and the following code draws a triangle on screen and the proof follows -
but i need to know how to drag the triangle such tht 1 angle is always set to 90 degrees.
i.e. i need to resize the triangle by dragging its vertex points by which the1 angle remains at 90 no matter what the size.
The proof has got some graphics code hardcoded in it - i.e. LINES AND POLYGONS have been hardcoded
i need to reconfigure that such that everytime the user increases the size of the triagnle and clicks on next it draws the lines and polygons in the correct area and place
PLEASE HELP
the code is as follows
MAIN CLASS
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.*;
import java.awt.event.*;
import java.text.*;
import javax.swing.*;
public class TestProof {
TestControl control; // the controls for the visual proof
TestView view; // the drawing area to display proof
// called upon class creation
public TestProof() {
view = new TestView();
view.setBackground(Color.WHITE);
control = new TestControl(view);
Frame f = new Frame("Pythagoras");
f.add(view,"Center");
f.add(control,"South");
f.setSize(600,600);
f.setBackground(Color.lightGray);
f.addMouseMotionListener(
new MouseMotionListener() { //anonymous inner class
//handle mouse drag event
public void mouseMoved(MouseEvent e) {
System.out.println("Mouse " + e.getX() +"," + e.getY());
public void mouseDragged(MouseEvent e) {
System.out.println("Draggg: x=" + e.getX() + "; y=" + e.getY());
JMenu File = new JMenu("File");
JMenuItem Exit = new JMenuItem("Exit");
Exit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
ExitActionPerformed(evt);
JMenuBar menuBar = new JMenuBar();
menuBar.add(File);
File.add(Exit);
f.add(menuBar,"North");
f.show();
private JMenuBar getMenuBar() {
JMenu File = new JMenu("File");
JMenuItem Exit = new JMenuItem("Exit");
Exit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
ExitActionPerformed(evt);
JMenuBar menuBar = new JMenuBar();
menuBar.add(File);
File.add(Exit);
return menuBar;
private void ExitActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
System.exit(0);
// for standalone use
public static void main(String args[]) {
TestProof TP = new TestProof();
}Test VIEW
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.text.*;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class TestView extends Canvas {
int TRANSLUCENT = 1;
int sequence; // sequencer that determines what should be drawn
// notes matter
int noteX = 100; // note coordinates
int noteY = 60;
int fontSize = 11; // font size
int lineSpacing // space between two consecutive lines
= fontSize + 2;
Font noteFaceFont; // font used to display notes
// objects matter
Polygon tri; // right-angled triangle with sides A, B, and C
Polygon tri1;
Polygon sqrA; // square with side of length A
Polygon sqrB; // square with side of length B
Polygon sqrC; // square with side of length C
Polygon parA; // parallelogram of base A and height A
Polygon parB; // parallelogram of base B and height B
Polygon poly1;
Polygon poly2;
Polygon poly3;
Polygon poly4;
Polygon poly5;
Polygon poly6;
int X0 = 350; // coordinates of triangle
int Y0 = 350;
int A = 90;//60; // triangle size
int B = 120;//80;
int C = 150;//100;
//CORDS of 2nd triangle
int X1 = 350;
int Y1 = 500;
// notes: three lines per note
String notes[] = {
// note 0
// note 1
// note 2
// note 3
// note 4
// note 5
// note 6
// note 7
// note 8
// note 9
// note 10
// note 11
// note 12
// note 13
// note 14
// constructor
public TestView() {
addMouseMotionListener(
new MouseMotionListener() { //anonymous inner class
//handle mouse drag event
public void mouseMoved(MouseEvent e) {
System.out.println("Mouse " + e.getX() +"," + e.getY());
public void mouseDragged(MouseEvent e) {
System.out.println("Draggg: x=" + e.getX() + "; y=" + e.getY());
// set font
noteFaceFont = new Font("TimesRoman", Font.PLAIN, fontSize);
// (coordinates specified w.r.t. to P0, unless otherwise specified)
// create the triangle
tri = new Polygon();
tri.addPoint(0, 0); // add P0 coordinate
tri.addPoint(A*A/C, -A*B/C); // add A3 coordinate
tri.addPoint(C, 0); // add C1 coordinate
tri.translate(X0, Y0); // place triangle
tri1 = new Polygon();
tri1.addPoint(0,0); // add P0 coordinate
tri1.addPoint(A*A/C +38, +A*B/C); // add A3 coordinate
tri1.addPoint(C, 0); // add C1 coordinate
tri1.translate(X1, Y1);
// create square of side A
sqrA = new Polygon();
sqrA.addPoint(0, 0); // add P0 coordinate
sqrA.addPoint(-A*B/C, -A*A/C); // add A1 coordinate
sqrA.addPoint(-A*(B-A)/C, -A*(A+B)/C); // add A2 coordinate
sqrA.addPoint(A*A/C, -A*B/C); // add A3 coordinate
sqrA.translate(X0, Y0); // place square
// create square of side B
// warning: the coordinate of this object are specified relative to C1
sqrB = new Polygon();
sqrB.addPoint(0, 0); // add C1 coordinate
sqrB.addPoint(B*A/C, -B*B/C); // add B1 coordinate
sqrB.addPoint(B*(A-B)/C, -B*(A+B)/C); // add B2 coordinate
sqrB.addPoint(-B*B/C, -B*A/C); // add A3 coordinate
sqrB.translate(X0 + C, Y0); // place square
// create square of side C
sqrC = new Polygon();
sqrC.addPoint(0, 0); // add P0 coordinate
sqrC.addPoint(C, 0); // add C1 coordinate
sqrC.addPoint(C, C); // add C2 coordinate
sqrC.addPoint(0, C); // add C3 coordinate
sqrC.translate(X0, Y0); // place square
poly1 = new Polygon();
poly1.addPoint(405,279);
poly1.addPoint(413,350);
poly1.addPoint(432,500);
poly1.addPoint(442,571);
poly1.addPoint(500,500);
poly1.addPoint(500,350);
poly2 = new Polygon();
poly2.addPoint(279,297);
poly2.addPoint(404,280);
poly2.addPoint(571,254);
poly2.addPoint(500,350);
poly2.addPoint(350,350);
//Polygon 3
poly3 = new Polygon();
poly3.addPoint(404,280);
poly3.addPoint(350,350);
poly3.addPoint(414,350);
poly4 = new Polygon();
poly4.addPoint(350,350);
poly4.addPoint(350,500);
poly4.addPoint(442,572);
poly4.addPoint(433,500);
poly4.addPoint(414,350);
poly5 = new Polygon();
poly5.addPoint(476,183);
poly5.addPoint(332,225);
poly5.addPoint(278,295);
poly5.addPoint(404,279);
poly5.addPoint(571,254);
poly6= new Polygon();
poly6.addPoint(405,278);
poly6.addPoint(332,224);
poly6.addPoint(476,182);
// create parallelogram of height A
parA = new Polygon();
parA.addPoint(0, 0); // add P0 coordinate
parA.addPoint(0, C); // add C3 coordinate
parA.addPoint(A*A/C, C - A*B/C); // add Q0 coordinate
parA.addPoint(A*A/C, -A*B/C); // add A3 coordinate
parA.translate(X0,Y0); // place parallelogram
// create parallelogram of height B
// warning: the coordinate of this object are specified from C1
parB = new Polygon();
parB.addPoint(0, 0); // add C1 coordinate
parB.addPoint(-B*B/C, -B*A/C); // add A3 coordinate
parB.addPoint(A*A/C - C, C - A*B/C); // add Q0 coordinate
parB.addPoint(0, C); // add C2 coordinate
parB.translate(X0 + C, Y0);
// place parallelogram
// depending on the sequence number we draw certain objects
public void paint(Graphics gfx) {
super.paint(gfx);
Graphics2D g = (Graphics2D) gfx;
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
// text first, then objects (and animation)
// we always output some notes
g.drawString(notes[3*sequence], noteX, noteY);
g.drawString(notes[3*sequence + 1], noteX, noteY + lineSpacing);
g.drawString(notes[3*sequence + 2], noteX, noteY + 2*lineSpacing);
// the object are drawn in an order so that they are properly overlapped
if(sequence == 13) {
g.setColor(Color.green);
g.fillPolygon(poly1);
g.fillPolygon(poly2);
g.fillPolygon(poly3);
g.fillPolygon(poly4);
g.fillPolygon(poly5);
g.setColor(Color.RED);
g.setColor(Color.GREEN);
g.drawLine(413,351,433,499);
g.setColor(Color.white);
g.fillPolygon(tri);
g.fillPolygon(tri1);
g.fillPolygon(poly6);
if(sequence == 12 ) {
g.setColor(Color.green);
g.fillPolygon(poly1);
g.fillPolygon(poly2);
g.fillPolygon(poly3);
g.fillPolygon(poly4);
g.fillPolygon(poly5);
g.setColor(Color.BLACK);
if(sequence == 11){
g.setColor(Color.green);
g.fillPolygon(poly1);
g.fillPolygon(poly3);
g.fillPolygon(poly4);
g.setColor(Color.BLACK);
if(sequence == 8 ){
g.setColor(Color.green);
g.fillPolygon(poly5);
g.setColor(Color.MAGENTA);
g.drawString("E",578,254);
g.drawString("D",268,302);
g.setColor(Color.black);
g.drawArc(250,150,350,250,320,65);
else if (sequence == 9 ){
g.setColor(Color.green);
g.fillPolygon(poly2);
g.setColor(Color.MAGENTA);
g.drawString("E",578,254);
g.drawString("D",268,302);
g.setColor(Color.black);
g.drawArc(250,150,350,250,320,65);
if( sequence == 10){
g.setColor(Color.green);
g.fillPolygon(poly2);
g.fillPolygon(poly5);
g.setColor(Color.black);
g.setColor(Color.MAGENTA);
g.drawString("E",578,254);
g.drawString("D",268,302);
g.setColor(Color.black);
g.drawArc(250,150,350,250,320,65);
if(sequence == 7){
g.setColor(Color.green);
g.fillPolygon(poly2);
g.setColor(Color.MAGENTA);
g.drawString("E",578,254);
g.drawString("D",268,302);
g.setColor(Color.black);
if(sequence == 6){
g.setColor(Color.yellow);
g.fillPolygon(poly2);
g.setColor(Color.green);
g.fillPolygon(poly3);
g.setColor(Color.blue);
g.fillPolygon(poly4);
g.setColor(Color.black);
g.drawArc(250,175,350,275,300,65);
//g.drawArc(250,150,350,250,320,65);
g.drawLine( 606,309,599,299);
g.drawLine(592,313, 599,299);
g.drawString("+90 degrees",605,378);
if (sequence == 5 ) {
g.setColor(Color.yellow);
g.fillPolygon(poly2);
g.setColor(Color.black);
if (sequence == 4) {
g.setColor(Color.YELLOW);
g.fillPolygon(poly1);
g.setColor(Color.black);
g.drawArc(319,310,250,195,89,-35);
g.drawLine(499,319, 492,312);
g.drawLine(499,319, 492,325);
g.drawArc(200,180, 233,238,-120,-60);
g.drawLine(200,298, 208,309);
g.drawLine(200,298, 194,313);
g.drawString("-90 degrees",227,347);
if (sequence >= 3) {
g.drawLine(404,279,442,572);
// draw the squares
if (sequence >= 2) {
g.drawLine(278,296,572,254);
// draw the squares
if (sequence >= 1) {
g.drawLine(333,224,476,182);
g.drawPolygon(tri1);
// always draw the triangle
g.drawPolygon(tri);
g.drawPolygon(sqrA);
g.drawPolygon(sqrB);
g.drawPolygon(sqrC);
g.setColor(Color.MAGENTA);
g.drawString("C", X0 + C/2 - fontSize/2, Y0 + lineSpacing);
g.drawString("A",
X0 + A*A/(2*C) - fontSize*A/B/2,
Y0 - A*B/(2*C) - lineSpacing*A/B);
g.drawString("B",
X0 + C - B*B/(2*C) - fontSize*A/B/2,// the last "-" isn't log.
Y0 - B*A/(2*C) - lineSpacing*A/B);
public void redraw(int sequence) {
this.sequence = sequence;
repaint();
}TEST CONTROL
* TestControl.java
* Created on 28 February 2005, 11:16
import java.awt.*;
import java.awt.event.*;
import java.text.*;
import javax.swing.JFrame;
* @author Kripa Bhojwani
public class TestControl extends Panel implements ActionListener {
TestView view;
int sequence; // event sequence
// constructor
public TestControl(TestView view) {
Button b = null;
Label label = new Label("A^2 ");
this.view = view; // initialize drawble area
sequence = 0; // initialize sequence
b = new Button("Prev");
b.addActionListener(this);
add(b);
b = new Button("Next");
b.addActionListener(this);
add(b);
add(label);
// exported method
public void actionPerformed(ActionEvent ev) {
String label = ev.getActionCommand();
if (label.equals("Prev")) {
if (sequence >0) {
--sequence;
else {
if (sequence < 15) {
++sequence;
this.setEnabled(false); // disable the controls
view.redraw(sequence);
this.setEnabled(true); // enable the controls
}Please help --- really need to sort this out...
THANKSOne of the problems you face is that it is hard to recognise which parts of your code are drawing the triangle. This is because you are writing code in a procedural way rather than an object oriented way.
In object oriented code you would have a triangle object that could draw itself. You would create the triangle object by specifying its sizes and angles in some way. Then it should be easy to change the triangles sizes and angles and ask all the drawn objects to redraw themselves. -
NEED HELP IN LABELLING A TRIANGLE _ VERTICES
PLEASE HELP ______
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.text.NumberFormat;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.DefaultTableCellRenderer;
import java.lang.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.awt.FileDialog;
import java.io.*;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import javax.swing.JFrame;
public class Geometry {
CardLayout cards;
JPanel panel;
public Geometry() {
cards = new CardLayout();
panel = new JPanel(cards);
addCards();
JFrame f = new JFrame("Geometry");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setJMenuBar(getMenuBar());
f.getContentPane().add(panel);
f.setSize(500,500);
f.setLocation(0,0);
f.setVisible(true);
f.addMouseMotionListener(
new MouseMotionListener() { //anonymous inner class
//handle mouse drag event
public void mouseMoved(MouseEvent e) {
System.out.println("Mouse " + e.getX() +"," + e.getY());
public void mouseDragged(MouseEvent e) {
System.out.println("Draggg: x=" + e.getX() + "; y=" + e.getY());
// public void mouseMoved(MouseEvent me) {
// System.out.println("Moving: x=" + me.getX() + "; y=" + me.getY());
// panel.addMouseMotionListener(
// new MouseMotionListener() { //anonymous inner class
// //handle mouse drag event
// public void mouseDragged(MouseEvent me) {
// setTitle("Dragging: x=" + me.getX() + "; y=" + me.getY());
// public void mouseMoved(MouseEvent me) {
// setTitle("Moving: x=" + me.getX() + "; y=" + me.getY());
private void addCards() {
// card one
TriangleModel tri = new TriangleModel(175,100,175,250,325,250);
TriangleView view = new TriangleView(tri);
JPanel panelOne = new JPanel(new BorderLayout());
panelOne.add(view.getUIPanel(), "North");
panelOne.add(view);
panelOne.add(view.getTablePanel(), "South");
panelOne.setName("Pythagoras's Theorem");
panel.add("Pythagoras's Theorem", panelOne);
view.addMouseMotionListener(
new MouseMotionListener() { //anonymous inner class
//handle mouse drag event
public void mouseMoved(MouseEvent e) {
System.out.println("Mouse at " + e.getX() +"," + e.getY());
public void mouseDragged(MouseEvent e) {
System.out.println("Dragging: x=" + e.getX() + "; y=" + e.getY());
// card two
TestModel trin = new TestModel(175,100,175,250,325,250);
TestView viewn = new TestView(trin);
JPanel panelTwo = new JPanel(new BorderLayout());
panelTwo.add(viewn.getUIPanel(), "North");
// panelTwo.setBackground(Color.blue);
panelTwo.setName("Similar Triangles");
panelTwo.add(viewn);
panelTwo.add(viewn.getTablePanel(), "South");
viewn.addMouseMotionListener(
new MouseMotionListener() { //anonymous inner class
//handle mouse drag event
public void mouseMoved(MouseEvent e) {
System.out.println("Mouse at " + e.getX() +"," + e.getY());
public void mouseDragged(MouseEvent e) {
System.out.println("Dragging: x=" + e.getX() + "; y=" + e.getY());
panel.add("Similar Triangles", panelTwo);
JPanel panelThree = new JPanel();
panelThree.setBackground(Color.white);
panelThree.setName("Circle Theorem1");
panel.add("Circle Theorem1", panelThree);
private JMenuBar getMenuBar() {
JMenu File = new JMenu("File");
JSeparator separator1 = new JSeparator();
JMenuItem Open = new JMenuItem("Open");
// Open.addActionListener(new java.awt.event.ActionListener() {
// public void actionPerformed(java.awt.event.ActionEvent evt) {
// openActionPerformed(evt);
JMenuItem Save = new JMenuItem("Save");
JMenuItem Print = new JMenuItem("Print");
JMenuItem Exit = new JMenuItem("Exit");
Exit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
ExitActionPerformed(evt);
JMenu theorem = new JMenu("Theorem");
ActionListener l = new ActionListener() {
public void actionPerformed(ActionEvent e) {
JMenuItem item = (JMenuItem)e.getSource();
String name = item.getActionCommand();
cards.show(panel, name);
Component[] c = panel.getComponents();
for(int j = 0; j < panel.getComponentCount(); j++) {
String name = c[j].getName();
JMenuItem item = new JMenuItem(name);
item.setActionCommand(name);
item.addActionListener(l);
theorem.add(item);
JMenuBar menuBar = new JMenuBar();
JMenuBar menuBar1 = new JMenuBar();
menuBar.add(File);
File.add(Open);
File.add(separator1);
File.add(Save);
File.add(Print);
File.add(Exit);
menuBar.add(theorem);
return menuBar;
// private void openActionPerformed(java.awt.event.ActionEvent evt) {
// FileDialog fileDialog = new FileDialog(this, "Open...", FileDialog.LOAD);
// fileDialog.show();
// if (fileDialog.getFile() == null)
// return;
// fileName = fileDialog.getDirectory() + File.separator + fileDialog.getFile();
// FileInputStream fis = null;
// String str = null;
// try {
// fis = new FileInputStream(fileName);
// int size = fis.available();
// byte[] bytes = new byte [size];
// fis.read(bytes);
// str = new String(bytes);
// } catch (IOException e) {
// } finally {
// try {
// fis.close();
// } catch (IOException e2) {
// if (str != null)
// textBox.setText(str);
private void ExitActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
System.exit(0);
public static void main(String[] args) {
new Geometry();
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.text.NumberFormat;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.DefaultTableCellRenderer;
public class Triangle
public Triangle()
TriangleModel tri = new TriangleModel(175,100,175,250,325,250);
TriangleView view = new TriangleView(tri);
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(view.getUIPanel(), "North");
f.getContentPane().add(view);
f.getContentPane().add(view.getTablePanel(), "South");
f.setSize(500,500);
f.setLocation(200,200);
f.setVisible(true);
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import javax.swing.JTable;
import javax.swing.event.MouseInputAdapter;
* TriangleControl.java
* Created on 06 February 2005, 01:19
* @author Rahindra Naidoo
public class TriangleControl extends MouseInputAdapter
TriangleView view;
TriangleModel model;
Point start;
boolean dragging, altering;
Rectangle lineLens; // used for line selection
public TriangleControl(TriangleView tv)
view = tv;
model = view.getModel();
dragging = altering = false;
lineLens = new Rectangle(0, 0, 6, 6);
public void mousePressed(MouseEvent e)
Point p = e.getPoint();
lineLens.setLocation(p.x - 3, p.y - 3);
// are we over a line
if(model.isLineSelected(lineLens))
start = p;
altering = true;
// or are we within the triangle
else if(model.contains(p))
start = p;
dragging = true;
public void mouseReleased(MouseEvent e)
altering = false;
dragging = false;
view.getCentroidLabel().setText("centroid location: " +
model.findCentroid());
view.repaint(); // for the construction lines
public void mouseDragged(MouseEvent e)
Point p = e.getPoint();
if(altering)
int x = p.x - start.x;
int y = p.y - start.y;
model.moveSide(x, y, p);
updateTable();
view.repaint();
start = p;
else if(dragging)
int x = p.x - start.x;
int y = p.y - start.y;
model.translate(x, y);
view.repaint();
start = p;
private void updateTable()
String[] lengths = model.getLengths();
String[] squares = model.getSquares();
String[] angles = model.getAngles();
JTable table = view.getTable();
for(int j = 0; j < angles.length; j++)
table.setValueAt(lengths[j], 1, j + 1);
table.setValueAt(squares[j], 2, j + 1);
table.setValueAt(angles[j], 3, j + 1);
view.getCentroidLabel().setText("centroid location: " +
model.findCentroid());
* TriangleModel.java
* Created on 06 February 2005, 01:18
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.text.NumberFormat;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.DefaultTableCellRenderer;
* @author Rahindra Naidoo
public class TriangleModel // (x1, y1)
{ // |\
static final int SIDES = 3; // | \
private int cx, cy; // | \
Polygon triangle; // |_ _\ (x3, y3)
int selectedIndex; // (x2, y2)
NumberFormat nf;
Line2D[] medians;
Point2D centroid;
public TriangleModel(int x1, int y1, int x2, int y2, int x3, int y3)
int[] x = new int[] { x1, x2, x3 };
int[] y = new int[] { y1, y2, y3 };
triangle = new Polygon(x, y, SIDES);
nf = NumberFormat.getNumberInstance();
nf.setMaximumFractionDigits(1);
public boolean contains(Point p)
// Polygon.contains doesn't work well enough
return (new Area(triangle)).contains(p);
public boolean isLineSelected(Rectangle r)
Line2D line = new Line2D.Double();
for(int j = 0; j < SIDES; j++)
int[] x = triangle.xpoints;
int[] y = triangle.ypoints;
int x1 = x[j];
int y1 = y[j];
int x2 = x[(j + 1) % SIDES];
int y2 = y[(j + 1) % SIDES];
line.setLine(x1, y1, x2, y2);
if(line.intersects(r))
selectedIndex = j;
return true;
selectedIndex = -1;
return false;
* Only works for right triangle with right angle at (x2, y2)
public void moveSide(int dx, int dy, Point p)
int[] x = triangle.xpoints;
int[] y = triangle.ypoints;
switch(selectedIndex)
case 0:
x[0] += dx;
x[1] += dx;
break;
case 1:
y[1] += dy;
y[2] += dy;
break;
case 2:
double rise = y[2] - y[0];
double run = x[2] - x[0];
double slope = rise/run;
// rise / run == (y[2] - p.y) / (x[2] - p.x)
x[2] = p.x + (int)((y[2] - p.y) / slope);
// rise / run == (p.y - y[0]) / (p.x - x[0])
y[0] = p.y - (int)((p.x - x[0]) * slope);
public void translate(int dx, int dy)
triangle.translate(dx, dy);
public Polygon getTriangle()
return triangle;
public String findCentroid()
int[] x = triangle.xpoints;
int[] y = triangle.ypoints;
// construct the medians defined as the line from
// any vertex to the midpoint of the opposite line
medians = new Line2D[x.length];
for(int j = 0; j < x.length; j++)
int next = (j + 1) % x.length;
int last = (j + 2) % x.length;
Point2D vertex = new Point2D.Double(x[j], y[j]);
// get midpoint of line opposite vertex
double dx = ((double)x[last] - x[next])/2;
double dy = ((double)y[last] - y[next])/2;
Point2D oppLineCenter = new Point2D.Double(x[next] + dx,
y[next] + dy);
medians[j] = new Line2D.Double(vertex, oppLineCenter);
// centroid is located on any median 2/3 the way from the
// vertex (P1) to the midpoint (P2) on the opposite side
double[] lengths = getSideLengths();
double dx = (medians[0].getX2() - medians[0].getX1())*2/3;
double dy = (medians[0].getY2() - medians[0].getY1())*2/3;
double px = medians[0].getX1() + dx;
double py = medians[0].getY1() + dy;
//System.out.println("px = " + nf.format(px) +
// "\tpy = " + nf.format(py));
centroid = new Point2D.Double(px, py);
return "(" + nf.format(px) + ", " + nf.format(py) + ")";
public String[] getAngles()
double[] lengths = getSideLengths();
String[] vertices = new String[lengths.length];
for(int j = 0; j < lengths.length; j++)
int opp = (j + 1) % lengths.length;
int last = (j + 2) % lengths.length;
double top = lengths[j] * lengths[j] +
lengths[last] * lengths[last] -
lengths[opp] * lengths[opp];
double divisor = 2 * lengths[j] * lengths[last];
double vertex = Math.acos(top / divisor);
vertices[j] = nf.format(Math.toDegrees(vertex));
return vertices;
public String[] getLengths()
double[] lengths = getSideLengths();
String[] lengthStrs = new String[lengths.length];
for(int j = 0; j < lengthStrs.length; j++)
lengthStrs[j] = nf.format(lengths[j]);
return lengthStrs;
public String[] getSquares()
double[] lengths = getSideLengths();
String[] squareStrs = new String[lengths.length];
for(int j = 0; j < squareStrs.length; j++)
squareStrs[j] = nf.format(lengths[j] * lengths[j]);
return squareStrs;
private double[] getSideLengths()
int[] x = triangle.xpoints;
int[] y = triangle.ypoints;
double[] lengths = new double[SIDES];
for(int j = 0; j < SIDES; j++)
int next = (j + 1) % SIDES;
lengths[j] = Point.distance(x[j], y[j], x[next], y[next]);
return lengths;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.text.NumberFormat;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.DefaultTableCellRenderer;
* TriangleView.java
* Created on 06 February 2005, 01:21
public class TriangleView extends JPanel
private TriangleModel model;
private Polygon triangle;
private JTable table;
private JLabel centroidLabel;
private boolean showConstruction;
TriangleControl control;
public TriangleView(TriangleModel model)
this.model = model;
triangle = model.getTriangle();
showConstruction = false;
control = new TriangleControl(this);
addMouseListener(control);
addMouseMotionListener(control);
public void paintComponent(Graphics g)
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.draw(triangle);
if(model.medians == null)
centroidLabel.setText("centroid location: " + model.findCentroid());
// draw medians and centroid point
if(showConstruction && !control.dragging)
g2.setPaint(Color.red);
for(int j = 0; j < 3; j++)
g2.draw(model.medians[j]);
g2.setPaint(Color.blue);
g2.fill(new Ellipse2D.Double(model.centroid.getX() - 2,
model.centroid.getY() - 2, 4, 4));
public TriangleModel getModel()
return model;
public JTable getTable()
return table;
public JLabel getCentroidLabel()
return centroidLabel;
public JPanel getUIPanel()
JCheckBox showCon = new JCheckBox("show construction");
showCon.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent e)
boolean state = ((JCheckBox)e.getSource()).isSelected();
showConstruction = state;
repaint();
JPanel panel = new JPanel();
panel.add(showCon);
return panel;
public JPanel getTablePanel()
String[] headers = new String[] { "", "", "", "" };
// row and column data labels
String[] rowHeaders = {
"sides", "lengths", "squares", "angles", "degrees"
String[] sidesRow = { "vertical", "horizontal", "hypotenuse" };
String[] anglesRow = { "hyp to ver", "ver to hor", "hor to hyp" };
// collect data from model
String[] angles = model.getAngles();
String[] lengths = model.getLengths();
String[] squares = model.getSquares();
String[][] allData = { sidesRow, lengths, squares, anglesRow, angles };
int rows = 5;
int cols = 4;
Object[][] data = new Object[rows][cols];
for(int row = 0; row < rows; row++)
data[row][0] = rowHeaders[row];
for(int col = 1; col < cols; col++)
data[row][col] = allData[row][col - 1];
table = new JTable(data, headers)
public boolean isCellEditable(int row, int col)
return false;
DefaultTableCellRenderer renderer =
(DefaultTableCellRenderer)table.getDefaultRenderer(String.class);
renderer.setHorizontalAlignment(JLabel.CENTER);
centroidLabel = new JLabel("centroid location: ", JLabel.CENTER);
Dimension d = centroidLabel.getPreferredSize();
d.height = table.getRowHeight();
centroidLabel.setPreferredSize(d);
JPanel panel = new JPanel(new BorderLayout());
panel.setBorder(BorderFactory.createTitledBorder("triangle data"));
panel.add(table);
panel.add(centroidLabel, "South");
return panel;
}PLEASE HELP ME TO LABEL THE TRIANGLE AND CHANGE THE VALUES OF THE JTABLE - to SHOW ASquare b Square and C square as well as a label on the bottom of the screen to show A^2 + B^2 = C^2 ...
ThANKSpublic void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.drawPolygon(triangle);
// label the triangle
String[] lengths = model.getLengths();
String[] squares = model.getSquares();
String[] angles = model.getAngles();
int[] x = triangle.xpoints;
int[] y = triangle.ypoints;
for(int j = 0; j < x.length; j++) {
Point2D vertex = new Point2D.Double(x[j], y[j]);
int next = (j + 0) % x.length;
int last = (j + 1) % x.length;
double dx = ((double)x[last] - x[next])/2;
double dy = ((double)y[last] - y[next])/2;
Point2D center = new Point2D.Double(x[next] + dx, y[next] + dy);
g2.drawString(angles[j],(int)vertex.getX(),(int)vertex.getY());
g2.drawString(lengths[j],(int)center.getX(),(int)center.getY());
g2.drawString(squares[0],100, getHeight());
g2.drawString(" + "+squares[1],150, getHeight());
g2.drawString(" = "+squares[2],200, getHeight());
if(model.medians == null)
centroidLabel.setText("centroid location: " + model.findCentroid());
// draw medians and centroid point
if(showConstruction && !control.dragging) {
g2.setPaint(Color.red);
for(int j = 0; j < 3; j++)
g2.draw(model.medians[j]);
g2.setPaint(Color.blue);
g2.fill(new Ellipse2D.Double(model.centroid.getX() - 2,
model.centroid.getY() - 2, 4, 4));
} -
URGENT HELP REQUIRED _ Creating Labels for Triangle
Hi everyone... the code below is my application - Pythagoras Theorem.. or rather displaying it.. But i have not been able to get the Vertex of the triangle Labelled as A B C... I need to do that and change the Triangle Table data to A B C insted of Horizontal Vertical and Hypotenuise and as the triangle is stretched on screen A B And C keep moving as well ...
Besides i need to Show this in the tabel
- Values of A ^ 2 , B^2 and C ^2 as welll as a row showing A^2+B^2 = C^2
the code is as follows..
This is the main class called Geometry
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.text.NumberFormat;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.DefaultTableCellRenderer;
import java.lang.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.awt.FileDialog;
import java.io.*;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import javax.swing.JFrame;
public class Geometry {
CardLayout cards;
JPanel panel;
public Geometry() {
cards = new CardLayout();
panel = new JPanel(cards);
addCards();
JFrame f = new JFrame("Geometry");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setJMenuBar(getMenuBar());
f.getContentPane().add(panel);
f.setSize(500,500);
f.setLocation(0,0);
f.setVisible(true);
f.addMouseMotionListener(
new MouseMotionListener() { //anonymous inner class
//handle mouse drag event
public void mouseMoved(MouseEvent e) {
System.out.println("Mouse " + e.getX() +"," + e.getY());
public void mouseDragged(MouseEvent e) {
System.out.println("Draggg: x=" + e.getX() + "; y=" + e.getY());
// public void mouseMoved(MouseEvent me) {
// System.out.println("Moving: x=" + me.getX() + "; y=" + me.getY());
// panel.addMouseMotionListener(
// new MouseMotionListener() { //anonymous inner class
// //handle mouse drag event
// public void mouseDragged(MouseEvent me) {
// setTitle("Dragging: x=" + me.getX() + "; y=" + me.getY());
// public void mouseMoved(MouseEvent me) {
// setTitle("Moving: x=" + me.getX() + "; y=" + me.getY());
private void addCards() {
// card one
TriangleModel tri = new TriangleModel(175,100,175,250,325,250);
TriangleView view = new TriangleView(tri);
JPanel panelOne = new JPanel(new BorderLayout());
panelOne.add(view.getUIPanel(), "North");
panelOne.add(view);
panelOne.add(view.getTablePanel(), "South");
panelOne.setName("Pythagoras's Theorem");
panel.add("Pythagoras's Theorem", panelOne);
view.addMouseMotionListener(
new MouseMotionListener() { //anonymous inner class
//handle mouse drag event
public void mouseMoved(MouseEvent e) {
System.out.println("Mouse at " + e.getX() +"," + e.getY());
public void mouseDragged(MouseEvent e) {
System.out.println("Dragging: x=" + e.getX() + "; y=" + e.getY());
// card two
TestModel trin = new TestModel(175,100,175,250,325,250);
TestView viewn = new TestView(trin);
JPanel panelTwo = new JPanel(new BorderLayout());
panelTwo.add(viewn.getUIPanel(), "North");
// panelTwo.setBackground(Color.blue);
panelTwo.setName("Similar Triangles");
panelTwo.add(viewn);
panelTwo.add(viewn.getTablePanel(), "South");
viewn.addMouseMotionListener(
new MouseMotionListener() { //anonymous inner class
//handle mouse drag event
public void mouseMoved(MouseEvent e) {
System.out.println("Mouse at " + e.getX() +"," + e.getY());
public void mouseDragged(MouseEvent e) {
System.out.println("Dragging: x=" + e.getX() + "; y=" + e.getY());
panel.add("Similar Triangles", panelTwo);
JPanel panelThree = new JPanel();
panelThree.setBackground(Color.white);
panelThree.setName("Circle Theorem1");
panel.add("Circle Theorem1", panelThree);
private JMenuBar getMenuBar() {
JMenu File = new JMenu("File");
JSeparator separator1 = new JSeparator();
JMenuItem Open = new JMenuItem("Open");
// Open.addActionListener(new java.awt.event.ActionListener() {
// public void actionPerformed(java.awt.event.ActionEvent evt) {
// openActionPerformed(evt);
JMenuItem Save = new JMenuItem("Save");
JMenuItem Print = new JMenuItem("Print");
JMenuItem Exit = new JMenuItem("Exit");
Exit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
ExitActionPerformed(evt);
JMenu theorem = new JMenu("Theorem");
ActionListener l = new ActionListener() {
public void actionPerformed(ActionEvent e) {
JMenuItem item = (JMenuItem)e.getSource();
String name = item.getActionCommand();
cards.show(panel, name);
Component[] c = panel.getComponents();
for(int j = 0; j < panel.getComponentCount(); j++) {
String name = c[j].getName();
JMenuItem item = new JMenuItem(name);
item.setActionCommand(name);
item.addActionListener(l);
theorem.add(item);
JMenuBar menuBar = new JMenuBar();
JMenuBar menuBar1 = new JMenuBar();
menuBar.add(File);
File.add(Open);
File.add(separator1);
File.add(Save);
File.add(Print);
File.add(Exit);
menuBar.add(theorem);
return menuBar;
// private void openActionPerformed(java.awt.event.ActionEvent evt) {
// FileDialog fileDialog = new FileDialog(this, "Open...", FileDialog.LOAD);
// fileDialog.show();
// if (fileDialog.getFile() == null)
// return;
// fileName = fileDialog.getDirectory() + File.separator + fileDialog.getFile();
// FileInputStream fis = null;
// String str = null;
// try {
// fis = new FileInputStream(fileName);
// int size = fis.available();
// byte[] bytes = new byte [size];
// fis.read(bytes);
// str = new String(bytes);
// } catch (IOException e) {
// } finally {
// try {
// fis.close();
// } catch (IOException e2) {
// if (str != null)
// textBox.setText(str);
private void ExitActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
System.exit(0);
public static void main(String[] args) {
new Geometry();
}import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.text.NumberFormat;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.DefaultTableCellRenderer;
public class Triangle
public Triangle()
TriangleModel tri = new TriangleModel(175,100,175,250,325,250);
TriangleView view = new TriangleView(tri);
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(view.getUIPanel(), "North");
f.getContentPane().add(view);
f.getContentPane().add(view.getTablePanel(), "South");
f.setSize(500,500);
f.setLocation(200,200);
f.setVisible(true);
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import javax.swing.JTable;
import javax.swing.event.MouseInputAdapter;
* TriangleControl.java
* Created on 06 February 2005, 01:19
* @author Rahindra Naidoo
public class TriangleControl extends MouseInputAdapter
TriangleView view;
TriangleModel model;
Point start;
boolean dragging, altering;
Rectangle lineLens; // used for line selection
public TriangleControl(TriangleView tv)
view = tv;
model = view.getModel();
dragging = altering = false;
lineLens = new Rectangle(0, 0, 6, 6);
public void mousePressed(MouseEvent e)
Point p = e.getPoint();
lineLens.setLocation(p.x - 3, p.y - 3);
// are we over a line
if(model.isLineSelected(lineLens))
start = p;
altering = true;
// or are we within the triangle
else if(model.contains(p))
start = p;
dragging = true;
public void mouseReleased(MouseEvent e)
altering = false;
dragging = false;
view.getCentroidLabel().setText("centroid location: " +
model.findCentroid());
view.repaint(); // for the construction lines
public void mouseDragged(MouseEvent e)
Point p = e.getPoint();
if(altering)
int x = p.x - start.x;
int y = p.y - start.y;
model.moveSide(x, y, p);
updateTable();
view.repaint();
start = p;
else if(dragging)
int x = p.x - start.x;
int y = p.y - start.y;
model.translate(x, y);
view.repaint();
start = p;
private void updateTable()
String[] lengths = model.getLengths();
String[] squares = model.getSquares();
String[] angles = model.getAngles();
JTable table = view.getTable();
for(int j = 0; j < angles.length; j++)
table.setValueAt(lengths[j], 1, j + 1);
table.setValueAt(squares[j], 2, j + 1);
table.setValueAt(angles[j], 3, j + 1);
view.getCentroidLabel().setText("centroid location: " +
model.findCentroid());
* TriangleModel.java
* Created on 06 February 2005, 01:18
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.text.NumberFormat;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.DefaultTableCellRenderer;
* @author Rahindra Naidoo
public class TriangleModel // (x1, y1)
{ // |\
static final int SIDES = 3; // | \
private int cx, cy; // | \
Polygon triangle; // |_ _\ (x3, y3)
int selectedIndex; // (x2, y2)
NumberFormat nf;
Line2D[] medians;
Point2D centroid;
public TriangleModel(int x1, int y1, int x2, int y2, int x3, int y3)
int[] x = new int[] { x1, x2, x3 };
int[] y = new int[] { y1, y2, y3 };
triangle = new Polygon(x, y, SIDES);
nf = NumberFormat.getNumberInstance();
nf.setMaximumFractionDigits(1);
public boolean contains(Point p)
// Polygon.contains doesn't work well enough
return (new Area(triangle)).contains(p);
public boolean isLineSelected(Rectangle r)
Line2D line = new Line2D.Double();
for(int j = 0; j < SIDES; j++)
int[] x = triangle.xpoints;
int[] y = triangle.ypoints;
int x1 = x[j];
int y1 = y[j];
int x2 = x[(j + 1) % SIDES];
int y2 = y[(j + 1) % SIDES];
line.setLine(x1, y1, x2, y2);
if(line.intersects(r))
selectedIndex = j;
return true;
selectedIndex = -1;
return false;
* Only works for right triangle with right angle at (x2, y2)
public void moveSide(int dx, int dy, Point p)
int[] x = triangle.xpoints;
int[] y = triangle.ypoints;
switch(selectedIndex)
case 0:
x[0] += dx;
x[1] += dx;
break;
case 1:
y[1] += dy;
y[2] += dy;
break;
case 2:
double rise = y[2] - y[0];
double run = x[2] - x[0];
double slope = rise/run;
// rise / run == (y[2] - p.y) / (x[2] - p.x)
x[2] = p.x + (int)((y[2] - p.y) / slope);
// rise / run == (p.y - y[0]) / (p.x - x[0])
y[0] = p.y - (int)((p.x - x[0]) * slope);
public void translate(int dx, int dy)
triangle.translate(dx, dy);
public Polygon getTriangle()
return triangle;
public String findCentroid()
int[] x = triangle.xpoints;
int[] y = triangle.ypoints;
// construct the medians defined as the line from
// any vertex to the midpoint of the opposite line
medians = new Line2D[x.length];
for(int j = 0; j < x.length; j++)
int next = (j + 1) % x.length;
int last = (j + 2) % x.length;
Point2D vertex = new Point2D.Double(x[j], y[j]);
// get midpoint of line opposite vertex
double dx = ((double)x[last] - x[next])/2;
double dy = ((double)y[last] - y[next])/2;
Point2D oppLineCenter = new Point2D.Double(x[next] + dx,
y[next] + dy);
medians[j] = new Line2D.Double(vertex, oppLineCenter);
// centroid is located on any median 2/3 the way from the
// vertex (P1) to the midpoint (P2) on the opposite side
double[] lengths = getSideLengths();
double dx = (medians[0].getX2() - medians[0].getX1())*2/3;
double dy = (medians[0].getY2() - medians[0].getY1())*2/3;
double px = medians[0].getX1() + dx;
double py = medians[0].getY1() + dy;
//System.out.println("px = " + nf.format(px) +
// "\tpy = " + nf.format(py));
centroid = new Point2D.Double(px, py);
return "(" + nf.format(px) + ", " + nf.format(py) + ")";
public String[] getAngles()
double[] lengths = getSideLengths();
String[] vertices = new String[lengths.length];
for(int j = 0; j < lengths.length; j++)
int opp = (j + 1) % lengths.length;
int last = (j + 2) % lengths.length;
double top = lengths[j] * lengths[j] +
lengths[last] * lengths[last] -
lengths[opp] * lengths[opp];
double divisor = 2 * lengths[j] * lengths[last];
double vertex = Math.acos(top / divisor);
vertices[j] = nf.format(Math.toDegrees(vertex));
return vertices;
public String[] getLengths()
double[] lengths = getSideLengths();
String[] lengthStrs = new String[lengths.length];
for(int j = 0; j < lengthStrs.length; j++)
lengthStrs[j] = nf.format(lengths[j]);
return lengthStrs;
public String[] getSquares()
double[] lengths = getSideLengths();
String[] squareStrs = new String[lengths.length];
for(int j = 0; j < squareStrs.length; j++)
squareStrs[j] = nf.format(lengths[j] * lengths[j]);
return squareStrs;
private double[] getSideLengths()
int[] x = triangle.xpoints;
int[] y = triangle.ypoints;
double[] lengths = new double[SIDES];
for(int j = 0; j < SIDES; j++)
int next = (j + 1) % SIDES;
lengths[j] = Point.distance(x[j], y[j], x[next], y[next]);
return lengths;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.text.NumberFormat;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.DefaultTableCellRenderer;
* TriangleView.java
* Created on 06 February 2005, 01:21
public class TriangleView extends JPanel
private TriangleModel model;
private Polygon triangle;
private JTable table;
private JLabel centroidLabel;
private boolean showConstruction;
TriangleControl control;
public TriangleView(TriangleModel model)
this.model = model;
triangle = model.getTriangle();
showConstruction = false;
control = new TriangleControl(this);
addMouseListener(control);
addMouseMotionListener(control);
public void paintComponent(Graphics g)
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.draw(triangle);
if(model.medians == null)
centroidLabel.setText("centroid location: " + model.findCentroid());
// draw medians and centroid point
if(showConstruction && !control.dragging)
g2.setPaint(Color.red);
for(int j = 0; j < 3; j++)
g2.draw(model.medians[j]);
g2.setPaint(Color.blue);
g2.fill(new Ellipse2D.Double(model.centroid.getX() - 2,
model.centroid.getY() - 2, 4, 4));
public TriangleModel getModel()
return model;
public JTable getTable()
return table;
public JLabel getCentroidLabel()
return centroidLabel;
public JPanel getUIPanel()
JCheckBox showCon = new JCheckBox("show construction");
showCon.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent e)
boolean state = ((JCheckBox)e.getSource()).isSelected();
showConstruction = state;
repaint();
JPanel panel = new JPanel();
panel.add(showCon);
return panel;
public JPanel getTablePanel()
String[] headers = new String[] { "", "", "", "" };
// row and column data labels
String[] rowHeaders = {
"sides", "lengths", "squares", "angles", "degrees"
String[] sidesRow = { "vertical", "horizontal", "hypotenuse" };
String[] anglesRow = { "hyp to ver", "ver to hor", "hor to hyp" };
// collect data from model
String[] angles = model.getAngles();
String[] lengths = model.getLengths();
String[] squares = model.getSquares();
String[][] allData = { sidesRow, lengths, squares, anglesRow, angles };
int rows = 5;
int cols = 4;
Object[][] data = new Object[rows][cols];
for(int row = 0; row < rows; row++)
data[row][0] = rowHeaders[row];
for(int col = 1; col < cols; col++)
data[row][col] = allData[row][col - 1];
table = new JTable(data, headers)
public boolean isCellEditable(int row, int col)
return false;
DefaultTableCellRenderer renderer =
(DefaultTableCellRenderer)table.getDefaultRenderer(String.class);
renderer.setHorizontalAlignment(JLabel.CENTER);
centroidLabel = new JLabel("centroid location: ", JLabel.CENTER);
Dimension d = centroidLabel.getPreferredSize();
d.height = table.getRowHeight();
centroidLabel.setPreferredSize(d);
JPanel panel = new JPanel(new BorderLayout());
panel.setBorder(BorderFactory.createTitledBorder("triangle data"));
panel.add(table);
panel.add(centroidLabel, "South");
return panel;
}PLEASE HELP ---- Also does any one know how to draw a Triangle on a screen which can be controlled by a JSlider such that as and whenits incremented the triangle increase and vice versa... I need to prove Similarity in triangles using A Jslider that controls one triangle while the other triangle is Still on screenSharan,
The code given was part of the assignment and you are supposed to make the changes for your part right?
Please give details of what you have done so far and not expect us to do your assignment for you. We'll be glad to help answer questions and point to the right direction, but giving us the entire assignment and saying, very nicely I might add, "Please do it for me." Just seems to make a mockery of the hours, days, and years that many of us has spent earning our degrees and learning our skills.
Work on it and ask specific questions with examples of what you have done and you'll get a much better response. -
PYTHAGORAS THEOREM __ URGENT HELP NEEDED
Hi everyone - I am developing various proofs of the pythagora's theorem
and the following code draws a triangle on screen and the proof follows -
but i need to know how to drag the triangle such tht 1 angle is always set to 90 degrees.
i.e. i need to resize the triangle by dragging its vertex points by which the1 angle remains at 90 no matter what the size.
The proof has got some graphics code hardcoded in it - i.e. LINES AND POLYGONS have been hardcoded
i need to reconfigure that such that everytime the user increases the size of the triagnle and clicks on next it draws the lines and polygons in the correct area and place
PLEASE HELP
the code is as follows
MAIN CLASS
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.*;
import java.awt.event.*;
import java.text.*;
import javax.swing.*;
public class TestProof {
TestControl control; // the controls for the visual proof
TestView view; // the drawing area to display proof
// called upon class creation
public TestProof() {
view = new TestView();
view.setBackground(Color.WHITE);
control = new TestControl(view);
Frame f = new Frame("Pythagoras");
f.add(view,"Center");
f.add(control,"South");
f.setSize(600,600);
f.setBackground(Color.lightGray);
f.addMouseMotionListener(
new MouseMotionListener() { //anonymous inner class
//handle mouse drag event
public void mouseMoved(MouseEvent e) {
System.out.println("Mouse " + e.getX() +"," + e.getY());
public void mouseDragged(MouseEvent e) {
System.out.println("Draggg: x=" + e.getX() + "; y=" + e.getY());
JMenu File = new JMenu("File");
JMenuItem Exit = new JMenuItem("Exit");
Exit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
ExitActionPerformed(evt);
JMenuBar menuBar = new JMenuBar();
menuBar.add(File);
File.add(Exit);
f.add(menuBar,"North");
f.show();
private JMenuBar getMenuBar() {
JMenu File = new JMenu("File");
JMenuItem Exit = new JMenuItem("Exit");
Exit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
ExitActionPerformed(evt);
JMenuBar menuBar = new JMenuBar();
menuBar.add(File);
File.add(Exit);
return menuBar;
private void ExitActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
System.exit(0);
// for standalone use
public static void main(String args[]) {
TestProof TP = new TestProof();
}Test VIEW
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.text.*;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class TestView extends Canvas {
int TRANSLUCENT = 1;
int sequence; // sequencer that determines what should be drawn
// notes matter
int noteX = 100; // note coordinates
int noteY = 60;
int fontSize = 11; // font size
int lineSpacing // space between two consecutive lines
= fontSize + 2;
Font noteFaceFont; // font used to display notes
// objects matter
Polygon tri; // right-angled triangle with sides A, B, and C
Polygon tri1;
Polygon sqrA; // square with side of length A
Polygon sqrB; // square with side of length B
Polygon sqrC; // square with side of length C
Polygon parA; // parallelogram of base A and height A
Polygon parB; // parallelogram of base B and height B
Polygon poly1;
Polygon poly2;
Polygon poly3;
Polygon poly4;
Polygon poly5;
Polygon poly6;
int X0 = 350; // coordinates of triangle
int Y0 = 350;
int A = 90;//60; // triangle size
int B = 120;//80;
int C = 150;//100;
//CORDS of 2nd triangle
int X1 = 350;
int Y1 = 500;
// notes: three lines per note
String notes[] = {
// note 0
// note 1
// note 2
// note 3
// note 4
// note 5
// note 6
// note 7
// note 8
// note 9
// note 10
// note 11
// note 12
// note 13
// note 14
// constructor
public TestView() {
addMouseMotionListener(
new MouseMotionListener() { //anonymous inner class
//handle mouse drag event
public void mouseMoved(MouseEvent e) {
System.out.println("Mouse " + e.getX() +"," + e.getY());
public void mouseDragged(MouseEvent e) {
System.out.println("Draggg: x=" + e.getX() + "; y=" + e.getY());
// set font
noteFaceFont = new Font("TimesRoman", Font.PLAIN, fontSize);
// (coordinates specified w.r.t. to P0, unless otherwise specified)
// create the triangle
tri = new Polygon();
tri.addPoint(0, 0); // add P0 coordinate
tri.addPoint(A*A/C, -A*B/C); // add A3 coordinate
tri.addPoint(C, 0); // add C1 coordinate
tri.translate(X0, Y0); // place triangle
tri1 = new Polygon();
tri1.addPoint(0,0); // add P0 coordinate
tri1.addPoint(A*A/C +38, +A*B/C); // add A3 coordinate
tri1.addPoint(C, 0); // add C1 coordinate
tri1.translate(X1, Y1);
// create square of side A
sqrA = new Polygon();
sqrA.addPoint(0, 0); // add P0 coordinate
sqrA.addPoint(-A*B/C, -A*A/C); // add A1 coordinate
sqrA.addPoint(-A*(B-A)/C, -A*(A+B)/C); // add A2 coordinate
sqrA.addPoint(A*A/C, -A*B/C); // add A3 coordinate
sqrA.translate(X0, Y0); // place square
// create square of side B
// warning: the coordinate of this object are specified relative to C1
sqrB = new Polygon();
sqrB.addPoint(0, 0); // add C1 coordinate
sqrB.addPoint(B*A/C, -B*B/C); // add B1 coordinate
sqrB.addPoint(B*(A-B)/C, -B*(A+B)/C); // add B2 coordinate
sqrB.addPoint(-B*B/C, -B*A/C); // add A3 coordinate
sqrB.translate(X0 + C, Y0); // place square
// create square of side C
sqrC = new Polygon();
sqrC.addPoint(0, 0); // add P0 coordinate
sqrC.addPoint(C, 0); // add C1 coordinate
sqrC.addPoint(C, C); // add C2 coordinate
sqrC.addPoint(0, C); // add C3 coordinate
sqrC.translate(X0, Y0); // place square
poly1 = new Polygon();
poly1.addPoint(405,279);
poly1.addPoint(413,350);
poly1.addPoint(432,500);
poly1.addPoint(442,571);
poly1.addPoint(500,500);
poly1.addPoint(500,350);
poly2 = new Polygon();
poly2.addPoint(279,297);
poly2.addPoint(404,280);
poly2.addPoint(571,254);
poly2.addPoint(500,350);
poly2.addPoint(350,350);
//Polygon 3
poly3 = new Polygon();
poly3.addPoint(404,280);
poly3.addPoint(350,350);
poly3.addPoint(414,350);
poly4 = new Polygon();
poly4.addPoint(350,350);
poly4.addPoint(350,500);
poly4.addPoint(442,572);
poly4.addPoint(433,500);
poly4.addPoint(414,350);
poly5 = new Polygon();
poly5.addPoint(476,183);
poly5.addPoint(332,225);
poly5.addPoint(278,295);
poly5.addPoint(404,279);
poly5.addPoint(571,254);
poly6= new Polygon();
poly6.addPoint(405,278);
poly6.addPoint(332,224);
poly6.addPoint(476,182);
// create parallelogram of height A
parA = new Polygon();
parA.addPoint(0, 0); // add P0 coordinate
parA.addPoint(0, C); // add C3 coordinate
parA.addPoint(A*A/C, C - A*B/C); // add Q0 coordinate
parA.addPoint(A*A/C, -A*B/C); // add A3 coordinate
parA.translate(X0,Y0); // place parallelogram
// create parallelogram of height B
// warning: the coordinate of this object are specified from C1
parB = new Polygon();
parB.addPoint(0, 0); // add C1 coordinate
parB.addPoint(-B*B/C, -B*A/C); // add A3 coordinate
parB.addPoint(A*A/C - C, C - A*B/C); // add Q0 coordinate
parB.addPoint(0, C); // add C2 coordinate
parB.translate(X0 + C, Y0);
// place parallelogram
// depending on the sequence number we draw certain objects
public void paint(Graphics gfx) {
super.paint(gfx);
Graphics2D g = (Graphics2D) gfx;
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
// text first, then objects (and animation)
// we always output some notes
g.drawString(notes[3*sequence], noteX, noteY);
g.drawString(notes[3*sequence + 1], noteX, noteY + lineSpacing);
g.drawString(notes[3*sequence + 2], noteX, noteY + 2*lineSpacing);
// the object are drawn in an order so that they are properly overlapped
if(sequence == 13) {
g.setColor(Color.green);
g.fillPolygon(poly1);
g.fillPolygon(poly2);
g.fillPolygon(poly3);
g.fillPolygon(poly4);
g.fillPolygon(poly5);
g.setColor(Color.RED);
g.setColor(Color.GREEN);
g.drawLine(413,351,433,499);
g.setColor(Color.white);
g.fillPolygon(tri);
g.fillPolygon(tri1);
g.fillPolygon(poly6);
if(sequence == 12 ) {
g.setColor(Color.green);
g.fillPolygon(poly1);
g.fillPolygon(poly2);
g.fillPolygon(poly3);
g.fillPolygon(poly4);
g.fillPolygon(poly5);
g.setColor(Color.BLACK);
if(sequence == 11){
g.setColor(Color.green);
g.fillPolygon(poly1);
g.fillPolygon(poly3);
g.fillPolygon(poly4);
g.setColor(Color.BLACK);
if(sequence == 8 ){
g.setColor(Color.green);
g.fillPolygon(poly5);
g.setColor(Color.MAGENTA);
g.drawString("E",578,254);
g.drawString("D",268,302);
g.setColor(Color.black);
g.drawArc(250,150,350,250,320,65);
else if (sequence == 9 ){
g.setColor(Color.green);
g.fillPolygon(poly2);
g.setColor(Color.MAGENTA);
g.drawString("E",578,254);
g.drawString("D",268,302);
g.setColor(Color.black);
g.drawArc(250,150,350,250,320,65);
if( sequence == 10){
g.setColor(Color.green);
g.fillPolygon(poly2);
g.fillPolygon(poly5);
g.setColor(Color.black);
g.setColor(Color.MAGENTA);
g.drawString("E",578,254);
g.drawString("D",268,302);
g.setColor(Color.black);
g.drawArc(250,150,350,250,320,65);
if(sequence == 7){
g.setColor(Color.green);
g.fillPolygon(poly2);
g.setColor(Color.MAGENTA);
g.drawString("E",578,254);
g.drawString("D",268,302);
g.setColor(Color.black);
if(sequence == 6){
g.setColor(Color.yellow);
g.fillPolygon(poly2);
g.setColor(Color.green);
g.fillPolygon(poly3);
g.setColor(Color.blue);
g.fillPolygon(poly4);
g.setColor(Color.black);
g.drawArc(250,175,350,275,300,65);
//g.drawArc(250,150,350,250,320,65);
g.drawLine( 606,309,599,299);
g.drawLine(592,313, 599,299);
g.drawString("+90 degrees",605,378);
if (sequence == 5 ) {
g.setColor(Color.yellow);
g.fillPolygon(poly2);
g.setColor(Color.black);
if (sequence == 4) {
g.setColor(Color.YELLOW);
g.fillPolygon(poly1);
g.setColor(Color.black);
g.drawArc(319,310,250,195,89,-35);
g.drawLine(499,319, 492,312);
g.drawLine(499,319, 492,325);
g.drawArc(200,180, 233,238,-120,-60);
g.drawLine(200,298, 208,309);
g.drawLine(200,298, 194,313);
g.drawString("-90 degrees",227,347);
if (sequence >= 3) {
g.drawLine(404,279,442,572);
// draw the squares
if (sequence >= 2) {
g.drawLine(278,296,572,254);
// draw the squares
if (sequence >= 1) {
g.drawLine(333,224,476,182);
g.drawPolygon(tri1);
// always draw the triangle
g.drawPolygon(tri);
g.drawPolygon(sqrA);
g.drawPolygon(sqrB);
g.drawPolygon(sqrC);
g.setColor(Color.MAGENTA);
g.drawString("C", X0 + C/2 - fontSize/2, Y0 + lineSpacing);
g.drawString("A",
X0 + A*A/(2*C) - fontSize*A/B/2,
Y0 - A*B/(2*C) - lineSpacing*A/B);
g.drawString("B",
X0 + C - B*B/(2*C) - fontSize*A/B/2,// the last "-" isn't log.
Y0 - B*A/(2*C) - lineSpacing*A/B);
public void redraw(int sequence) {
this.sequence = sequence;
repaint();
}TEST CONTROL
* TestControl.java
* Created on 28 February 2005, 11:16
import java.awt.*;
import java.awt.event.*;
import java.text.*;
import javax.swing.JFrame;
* @author Kripa Bhojwani
public class TestControl extends Panel implements ActionListener {
TestView view;
int sequence; // event sequence
// constructor
public TestControl(TestView view) {
Button b = null;
Label label = new Label("A^2 ");
this.view = view; // initialize drawble area
sequence = 0; // initialize sequence
b = new Button("Prev");
b.addActionListener(this);
add(b);
b = new Button("Next");
b.addActionListener(this);
add(b);
add(label);
// exported method
public void actionPerformed(ActionEvent ev) {
String label = ev.getActionCommand();
if (label.equals("Prev")) {
if (sequence >0) {
--sequence;
else {
if (sequence < 15) {
++sequence;
this.setEnabled(false); // disable the controls
view.redraw(sequence);
this.setEnabled(true); // enable the controls
}Please help --- really need to sort this out...
THANKSCan any one help me with this --
basically need to draw a triangle with BC as the Base and the HYPOTENUSE of a right angle triangle right angled at A...
[ code]
A
B/-----------------------------/C
So angle A should be 90 degrees
and the user should be able to Drag sides B and C anywhere on screen
PLEASE HELP -
PYTHAGORAS THEOREM ) HELP NEEDED
Hi everyone - I am developing various proofs of the pythagora's theorem
and the following code draws a triangle on screen and the proof follows -
but i need to know how to drag the triangle such tht 1 angle is always set to 90 degrees.
i.e. i need to resize the triangle by dragging its vertex points by which the1 angle remains at 90 no matter what the size.
The proof has got some graphics code hardcoded in it - i.e. LINES AND POLYGONS have been hardcoded
i need to reconfigure that such that everytime the user increases the size of the triagnle and clicks on next it draws the lines and polygons in the correct area and place
PLEASE HELP
the code is as follows
MAIN CLASS
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.*;
import java.awt.event.*;
import java.text.*;
import javax.swing.*;
public class TestProof {
TestControl control; // the controls for the visual proof
TestView view; // the drawing area to display proof
// called upon class creation
public TestProof() {
view = new TestView();
view.setBackground(Color.WHITE);
control = new TestControl(view);
Frame f = new Frame("Pythagoras");
f.add(view,"Center");
f.add(control,"South");
f.setSize(600,600);
f.setBackground(Color.lightGray);
f.addMouseMotionListener(
new MouseMotionListener() { //anonymous inner class
//handle mouse drag event
public void mouseMoved(MouseEvent e) {
System.out.println("Mouse " + e.getX() +"," + e.getY());
public void mouseDragged(MouseEvent e) {
System.out.println("Draggg: x=" + e.getX() + "; y=" + e.getY());
JMenu File = new JMenu("File");
JMenuItem Exit = new JMenuItem("Exit");
Exit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
ExitActionPerformed(evt);
JMenuBar menuBar = new JMenuBar();
menuBar.add(File);
File.add(Exit);
f.add(menuBar,"North");
f.show();
private JMenuBar getMenuBar() {
JMenu File = new JMenu("File");
JMenuItem Exit = new JMenuItem("Exit");
Exit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
ExitActionPerformed(evt);
JMenuBar menuBar = new JMenuBar();
menuBar.add(File);
File.add(Exit);
return menuBar;
private void ExitActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
System.exit(0);
// for standalone use
public static void main(String args[]) {
TestProof TP = new TestProof();
}Test VIEW
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.text.*;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class TestView extends Canvas {
int TRANSLUCENT = 1;
int sequence; // sequencer that determines what should be drawn
// notes matter
int noteX = 100; // note coordinates
int noteY = 60;
int fontSize = 11; // font size
int lineSpacing // space between two consecutive lines
= fontSize + 2;
Font noteFaceFont; // font used to display notes
// objects matter
Polygon tri; // right-angled triangle with sides A, B, and C
Polygon tri1;
Polygon sqrA; // square with side of length A
Polygon sqrB; // square with side of length B
Polygon sqrC; // square with side of length C
Polygon parA; // parallelogram of base A and height A
Polygon parB; // parallelogram of base B and height B
Polygon poly1;
Polygon poly2;
Polygon poly3;
Polygon poly4;
Polygon poly5;
Polygon poly6;
int X0 = 350; // coordinates of triangle
int Y0 = 350;
int A = 90;//60; // triangle size
int B = 120;//80;
int C = 150;//100;
//CORDS of 2nd triangle
int X1 = 350;
int Y1 = 500;
// notes: three lines per note
String notes[] = {
// note 0
// note 1
// note 2
// note 3
// note 4
// note 5
// note 6
// note 7
// note 8
// note 9
// note 10
// note 11
// note 12
// note 13
// note 14
// constructor
public TestView() {
addMouseMotionListener(
new MouseMotionListener() { //anonymous inner class
//handle mouse drag event
public void mouseMoved(MouseEvent e) {
System.out.println("Mouse " + e.getX() +"," + e.getY());
public void mouseDragged(MouseEvent e) {
System.out.println("Draggg: x=" + e.getX() + "; y=" + e.getY());
// set font
noteFaceFont = new Font("TimesRoman", Font.PLAIN, fontSize);
// (coordinates specified w.r.t. to P0, unless otherwise specified)
// create the triangle
tri = new Polygon();
tri.addPoint(0, 0); // add P0 coordinate
tri.addPoint(A*A/C, -A*B/C); // add A3 coordinate
tri.addPoint(C, 0); // add C1 coordinate
tri.translate(X0, Y0); // place triangle
tri1 = new Polygon();
tri1.addPoint(0,0); // add P0 coordinate
tri1.addPoint(A*A/C +38, +A*B/C); // add A3 coordinate
tri1.addPoint(C, 0); // add C1 coordinate
tri1.translate(X1, Y1);
// create square of side A
sqrA = new Polygon();
sqrA.addPoint(0, 0); // add P0 coordinate
sqrA.addPoint(-A*B/C, -A*A/C); // add A1 coordinate
sqrA.addPoint(-A*(B-A)/C, -A*(A+B)/C); // add A2 coordinate
sqrA.addPoint(A*A/C, -A*B/C); // add A3 coordinate
sqrA.translate(X0, Y0); // place square
// create square of side B
// warning: the coordinate of this object are specified relative to C1
sqrB = new Polygon();
sqrB.addPoint(0, 0); // add C1 coordinate
sqrB.addPoint(B*A/C, -B*B/C); // add B1 coordinate
sqrB.addPoint(B*(A-B)/C, -B*(A+B)/C); // add B2 coordinate
sqrB.addPoint(-B*B/C, -B*A/C); // add A3 coordinate
sqrB.translate(X0 + C, Y0); // place square
// create square of side C
sqrC = new Polygon();
sqrC.addPoint(0, 0); // add P0 coordinate
sqrC.addPoint(C, 0); // add C1 coordinate
sqrC.addPoint(C, C); // add C2 coordinate
sqrC.addPoint(0, C); // add C3 coordinate
sqrC.translate(X0, Y0); // place square
poly1 = new Polygon();
poly1.addPoint(405,279);
poly1.addPoint(413,350);
poly1.addPoint(432,500);
poly1.addPoint(442,571);
poly1.addPoint(500,500);
poly1.addPoint(500,350);
poly2 = new Polygon();
poly2.addPoint(279,297);
poly2.addPoint(404,280);
poly2.addPoint(571,254);
poly2.addPoint(500,350);
poly2.addPoint(350,350);
//Polygon 3
poly3 = new Polygon();
poly3.addPoint(404,280);
poly3.addPoint(350,350);
poly3.addPoint(414,350);
poly4 = new Polygon();
poly4.addPoint(350,350);
poly4.addPoint(350,500);
poly4.addPoint(442,572);
poly4.addPoint(433,500);
poly4.addPoint(414,350);
poly5 = new Polygon();
poly5.addPoint(476,183);
poly5.addPoint(332,225);
poly5.addPoint(278,295);
poly5.addPoint(404,279);
poly5.addPoint(571,254);
poly6= new Polygon();
poly6.addPoint(405,278);
poly6.addPoint(332,224);
poly6.addPoint(476,182);
// create parallelogram of height A
parA = new Polygon();
parA.addPoint(0, 0); // add P0 coordinate
parA.addPoint(0, C); // add C3 coordinate
parA.addPoint(A*A/C, C - A*B/C); // add Q0 coordinate
parA.addPoint(A*A/C, -A*B/C); // add A3 coordinate
parA.translate(X0,Y0); // place parallelogram
// create parallelogram of height B
// warning: the coordinate of this object are specified from C1
parB = new Polygon();
parB.addPoint(0, 0); // add C1 coordinate
parB.addPoint(-B*B/C, -B*A/C); // add A3 coordinate
parB.addPoint(A*A/C - C, C - A*B/C); // add Q0 coordinate
parB.addPoint(0, C); // add C2 coordinate
parB.translate(X0 + C, Y0);
// place parallelogram
// depending on the sequence number we draw certain objects
public void paint(Graphics gfx) {
super.paint(gfx);
Graphics2D g = (Graphics2D) gfx;
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
// text first, then objects (and animation)
// we always output some notes
g.drawString(notes[3*sequence], noteX, noteY);
g.drawString(notes[3*sequence + 1], noteX, noteY + lineSpacing);
g.drawString(notes[3*sequence + 2], noteX, noteY + 2*lineSpacing);
// the object are drawn in an order so that they are properly overlapped
if(sequence == 13) {
g.setColor(Color.green);
g.fillPolygon(poly1);
g.fillPolygon(poly2);
g.fillPolygon(poly3);
g.fillPolygon(poly4);
g.fillPolygon(poly5);
g.setColor(Color.RED);
g.setColor(Color.GREEN);
g.drawLine(413,351,433,499);
g.setColor(Color.white);
g.fillPolygon(tri);
g.fillPolygon(tri1);
g.fillPolygon(poly6);
if(sequence == 12 ) {
g.setColor(Color.green);
g.fillPolygon(poly1);
g.fillPolygon(poly2);
g.fillPolygon(poly3);
g.fillPolygon(poly4);
g.fillPolygon(poly5);
g.setColor(Color.BLACK);
if(sequence == 11){
g.setColor(Color.green);
g.fillPolygon(poly1);
g.fillPolygon(poly3);
g.fillPolygon(poly4);
g.setColor(Color.BLACK);
if(sequence == 8 ){
g.setColor(Color.green);
g.fillPolygon(poly5);
g.setColor(Color.MAGENTA);
g.drawString("E",578,254);
g.drawString("D",268,302);
g.setColor(Color.black);
g.drawArc(250,150,350,250,320,65);
else if (sequence == 9 ){
g.setColor(Color.green);
g.fillPolygon(poly2);
g.setColor(Color.MAGENTA);
g.drawString("E",578,254);
g.drawString("D",268,302);
g.setColor(Color.black);
g.drawArc(250,150,350,250,320,65);
if( sequence == 10){
g.setColor(Color.green);
g.fillPolygon(poly2);
g.fillPolygon(poly5);
g.setColor(Color.black);
g.setColor(Color.MAGENTA);
g.drawString("E",578,254);
g.drawString("D",268,302);
g.setColor(Color.black);
g.drawArc(250,150,350,250,320,65);
if(sequence == 7){
g.setColor(Color.green);
g.fillPolygon(poly2);
g.setColor(Color.MAGENTA);
g.drawString("E",578,254);
g.drawString("D",268,302);
g.setColor(Color.black);
if(sequence == 6){
g.setColor(Color.yellow);
g.fillPolygon(poly2);
g.setColor(Color.green);
g.fillPolygon(poly3);
g.setColor(Color.blue);
g.fillPolygon(poly4);
g.setColor(Color.black);
g.drawArc(250,175,350,275,300,65);
//g.drawArc(250,150,350,250,320,65);
g.drawLine( 606,309,599,299);
g.drawLine(592,313, 599,299);
g.drawString("+90 degrees",605,378);
if (sequence == 5 ) {
g.setColor(Color.yellow);
g.fillPolygon(poly2);
g.setColor(Color.black);
if (sequence == 4) {
g.setColor(Color.YELLOW);
g.fillPolygon(poly1);
g.setColor(Color.black);
g.drawArc(319,310,250,195,89,-35);
g.drawLine(499,319, 492,312);
g.drawLine(499,319, 492,325);
g.drawArc(200,180, 233,238,-120,-60);
g.drawLine(200,298, 208,309);
g.drawLine(200,298, 194,313);
g.drawString("-90 degrees",227,347);
if (sequence >= 3) {
g.drawLine(404,279,442,572);
// draw the squares
if (sequence >= 2) {
g.drawLine(278,296,572,254);
// draw the squares
if (sequence >= 1) {
g.drawLine(333,224,476,182);
g.drawPolygon(tri1);
// always draw the triangle
g.drawPolygon(tri);
g.drawPolygon(sqrA);
g.drawPolygon(sqrB);
g.drawPolygon(sqrC);
g.setColor(Color.MAGENTA);
g.drawString("C", X0 + C/2 - fontSize/2, Y0 + lineSpacing);
g.drawString("A",
X0 + A*A/(2*C) - fontSize*A/B/2,
Y0 - A*B/(2*C) - lineSpacing*A/B);
g.drawString("B",
X0 + C - B*B/(2*C) - fontSize*A/B/2,// the last "-" isn't log.
Y0 - B*A/(2*C) - lineSpacing*A/B);
public void redraw(int sequence) {
this.sequence = sequence;
repaint();
}TEST CONTROL
* TestControl.java
* Created on 28 February 2005, 11:16
import java.awt.*;
import java.awt.event.*;
import java.text.*;
import javax.swing.JFrame;
* @author Kripa Bhojwani
public class TestControl extends Panel implements ActionListener {
TestView view;
int sequence; // event sequence
// constructor
public TestControl(TestView view) {
Button b = null;
Label label = new Label("A^2 ");
this.view = view; // initialize drawble area
sequence = 0; // initialize sequence
b = new Button("Prev");
b.addActionListener(this);
add(b);
b = new Button("Next");
b.addActionListener(this);
add(b);
add(label);
// exported method
public void actionPerformed(ActionEvent ev) {
String label = ev.getActionCommand();
if (label.equals("Prev")) {
if (sequence >0) {
--sequence;
else {
if (sequence < 15) {
++sequence;
this.setEnabled(false); // disable the controls
view.redraw(sequence);
this.setEnabled(true); // enable the controls
}Please help --- really need to sort this out...
THANKSCross post http://forum.java.sun.com/thread.jspa?threadID=603432&messageID=3251958#3251958
-
I am really sorry but I am still stuck. Please help.
Please can someone help me with the following code. I have a number of questions. So far all buttons that I have coded actions for work fine. When The program saves it does it correctly as I have seen the text file. However I have some problems.
1) How can I declare the arrays in another way without setting them to "" when the program starts. I need the program to start and show the previous saved arrays instead. I dont know if my method used for retrieving data from the file is correct either?.
2) When retrieving the values from a file that has example (all are string values). ADAM SANDLER 111 222 333 MICKY MOUSE 222 444 666
Where I want them to be in the follwing arrays as an example.
String name[1] = ADAM
String surname[1] = SANDLER
String home[1] = 111
String work[1] = 222
String cell[1] = 333
String name[2] = MICKY
String surname[2] = MOUSE
String home[2] = 222
String work[2] = 444
String cell[2] = 666
Here is my code.
Filename: ContactsListInterface.java
Date: 16 March 2008
Programmer: Yucca Nel
Purpose: Provides a GUI for entering names and contact numbers into a telephone directory.
Also allows options for searching for a specific name and deleting of data from the record
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
import java.io.*;
import java.util.*;
import java.text.*;
public class ContactsListInterface extends JFrame implements ActionListener
{ //start of class
// Declare outputstream and inputStream
DataOutputStream output;
DataInputStream input;
String filename = "phonebook";
// construct fields, buttons, labels and text boxes
JTextPane displayPane = new JTextPane();
JLabel listOfContacts = new JLabel("List Of Contacts"); // creates a label for the scrollpane
JButton createButton = new JButton("Create");
JButton searchButton = new JButton("Search");
JButton modifyButton = new JButton("Modify");
JButton deleteButton = new JButton("Delete");
// declare data arrays for name, surname, work number, home number and cell number
private String name[] = {""};
private String surname[] = {""};
private String home[] = {""};
private String work[] = {""};
private String cell[] = {""};
// create an instance of the ContactsListInterface
public ContactsListInterface()
{ // start of cli()
super("Phonebook Interface");
} // end of cli()
public JMenuBar createMenuBar()
{ // start of the createMenuBar()
// construct and populate a menu bar
JMenuBar mnuBar = new JMenuBar(); // creates a menu bar
setJMenuBar(mnuBar);
JMenu mnuFile = new JMenu("File",true); // creates a file menu in the menu bar which is visible
mnuFile.setMnemonic(KeyEvent.VK_F);
mnuFile.setDisplayedMnemonicIndex(0);
mnuFile.setToolTipText("File Options");
mnuBar.add(mnuFile);
JMenuItem mnuFileExit = new JMenuItem("Exit"); // creates an exit option in the file menu
mnuFileExit.setMnemonic(KeyEvent.VK_X);
mnuFileExit.setDisplayedMnemonicIndex(1);
mnuFileExit.setToolTipText("Close Application");
mnuFile.add(mnuFileExit);
mnuFileExit.setActionCommand("Exit");
mnuFileExit.addActionListener(this);
JMenu mnuEdit = new JMenu("Edit",true); // creates a menu for editing options
mnuEdit.setMnemonic(KeyEvent.VK_E);
mnuEdit.setDisplayedMnemonicIndex(0);
mnuEdit.setToolTipText("Edit Options");
mnuBar.add(mnuEdit);
JMenu mnuEditSort = new JMenu("Sort",true); // creates an option for sorting entries
mnuEditSort.setMnemonic(KeyEvent.VK_S);
mnuEditSort.setDisplayedMnemonicIndex(0);
mnuEdit.add(mnuEditSort);
JMenuItem mnuEditSortByName = new JMenuItem("Sort By Name"); // to sort entries by name
mnuEditSortByName.setMnemonic(KeyEvent.VK_N);
mnuEditSortByName.setDisplayedMnemonicIndex(8);
mnuEditSortByName.setToolTipText("Sort entries by first name");
mnuEditSortByName.setActionCommand("Name");
mnuEditSortByName.addActionListener(this);
mnuEditSort.add(mnuEditSortByName);
JMenuItem mnuEditSortBySurname = new JMenuItem("Sort By Surname"); // to sort entries by surname
mnuEditSortBySurname.setMnemonic(KeyEvent.VK_R);
mnuEditSortBySurname.setDisplayedMnemonicIndex(10);
mnuEditSortBySurname.setToolTipText("Sort entries by surname");
mnuEditSortBySurname.setActionCommand("Surname");
mnuEditSortBySurname.addActionListener(this);
mnuEditSort.add(mnuEditSortBySurname);
JMenu mnuHelp = new JMenu("Help",true); // creates a menu for help options
mnuHelp.setMnemonic(KeyEvent.VK_H);
mnuHelp.setDisplayedMnemonicIndex(0);
mnuHelp.setToolTipText("Help options");
mnuBar.add(mnuHelp);
JMenuItem mnuHelpHelp = new JMenuItem("Help"); // creates a help option for help topic
mnuHelpHelp.setMnemonic(KeyEvent.VK_P);
mnuHelpHelp.setDisplayedMnemonicIndex(3);
mnuHelpHelp.setToolTipText("Help Topic");
mnuHelpHelp.setActionCommand("Help");
mnuHelpHelp.addActionListener(this);
mnuHelp.add(mnuHelpHelp);
JMenuItem mnuHelpAbout = new JMenuItem("About"); // creates a about option for info about api
mnuHelpAbout.setMnemonic(KeyEvent.VK_T);
mnuHelpAbout.setDisplayedMnemonicIndex(4);
mnuHelpAbout.setToolTipText("About this program");
mnuHelpAbout.setActionCommand("About");
mnuHelpAbout.addActionListener(this);
mnuHelp.add(mnuHelpAbout);
return mnuBar;
} // end of the createMenuBar()
// create the content pane
public Container createContentPane()
{ // start of createContentPane()
// try blocks for the input and output
try
output = new DataOutputStream(new FileOutputStream(filename));
catch(IOException io)
JOptionPane.showMessageDialog(null,"This program could not create a storage location. Please check the disk drive and the tun the program again.","Error",JOptionPane.ERROR_MESSAGE);
System.exit(1);
//construct and populate panels and content pane
JPanel labelPanel = new JPanel(); // panel is only used to put the label for the textpane in
labelPanel.setLayout(new FlowLayout());
labelPanel.add(listOfContacts);
JPanel displayPanel = new JPanel();// panel is used to display all the contacts and thier numbers
setTabsAndStyles(displayPane);
displayPane = addTextToTextPane();
displayPane.setEditable(false);
JScrollPane scrollPane = new JScrollPane(displayPane);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); // pane is scrollable vertically
scrollPane.setWheelScrollingEnabled(true);// pane is scrollable by use of the mouse wheel
scrollPane.setPreferredSize(new Dimension(400,320));
displayPanel.add(scrollPane);
JPanel workPanel = new JPanel();// panel is used to enter, edit and delete data
workPanel.setLayout(new FlowLayout());
workPanel.add(createButton);
createButton.setToolTipText("Create a new entry");
createButton.addActionListener(this);
workPanel.add(searchButton);
searchButton.setToolTipText("Search for an entry by name number or surname");
searchButton.addActionListener(this);
workPanel.add(modifyButton);
modifyButton.setToolTipText("Modify an existing entry");
modifyButton.addActionListener(this);
workPanel.add(deleteButton);
deleteButton.setToolTipText("Delete an existing entry");
deleteButton.addActionListener(this);
labelPanel.setBackground(Color.red);
displayPanel.setBackground(Color.red);
workPanel.setBackground(Color.red);
// create container and set attributes
Container c = getContentPane();
c.setLayout(new BorderLayout(30,30));
c.add(labelPanel,BorderLayout.NORTH);
c.add(displayPanel,BorderLayout.CENTER);
c.add(workPanel,BorderLayout.SOUTH);
c.setBackground(Color.red);
// add a listener for the window closing and save
addWindowListener(
new WindowAdapter()
public void windowClosing(WindowEvent e)
int answer = JOptionPane.showConfirmDialog(null,"Are you sure you would like to save all changes and exit?","File submission",JOptionPane.YES_NO_OPTION);
if(answer == JOptionPane.YES_OPTION)
save();
System.exit(0);
return c;
} // end of createContentPane()
protected void setTabsAndStyles(JTextPane displayPane)
{ // Start of setTabsAndStyles()
// set Font style
Style fontStyle = StyleContext.getDefaultStyleContext().getStyle(StyleContext.DEFAULT_STYLE);
Style regular = displayPane.addStyle("regular", fontStyle);
StyleConstants.setFontFamily(fontStyle, "SansSerif");
Style s = displayPane.addStyle("bold", regular);
StyleConstants.setBold(s,true);
} // End of setTabsAndStyles()
public JTextPane addTextToTextPane()
{ // start of addTextToTextPane()
try
input = new DataInputStream(new FileInputStream(filename));
for(int i=0; i<name.length;i++)
name[i] = input.readUTF();
surname[i] = input.readUTF();
home[i] = input.readUTF();
work[i] = input.readUTF();
cell[i] = input.readUTF();
catch(IOException io)
Document doc = displayPane.getDocument();
try
{ // start of tryblock
// clear previous text
doc.remove(0,doc.getLength());
// insert titles of columns
doc.insertString(0,"NAME\tSURNAME\tHOME NO\tWORK NO\tCELL NO\n",displayPane.getStyle("bold"));
// insert data
for(int i=0; i<name.length; i++)
doc.insertString(doc.getLength(), name[i] +"\t",displayPane.getStyle("regular"));
doc.insertString(doc.getLength(), surname[i] +"\t",displayPane.getStyle("regular"));
doc.insertString(doc.getLength(), home[i]+"\t",displayPane.getStyle("regular"));
doc.insertString(doc.getLength(), work[i]+"\t",displayPane.getStyle("regular"));
doc.insertString(doc.getLength(), cell[i]+"\t",displayPane.getStyle("regular"));
} // end of try block
catch(BadLocationException ble)
{ // start of ble exception handler
System.err.println("Could not insert text.");
} // end of ble exception handler
return displayPane;
} // end of addTextToTextPane()
// code to process user clicks
public void actionPerformed(ActionEvent e)
{ // start of actionPerformed()
String arg = e.getActionCommand();
// user clicks exit option
if(arg.equals("Exit"))
int answer = JOptionPane.showConfirmDialog(null,"Exiting will save all changes to file. \nAre you sure you would like to save and exit now?","File submission",JOptionPane.YES_NO_OPTION);
if(answer == JOptionPane.YES_OPTION)
save();
System.exit(1);
// user clicks help option
if(arg.equals("Help"))
JOptionPane.showMessageDialog(null, "Welcome to the phone book application. To add a new entry press the \"Create\" button.\n To search for an entry press the \"Search\" button.\n To modify an existing entry press the \"Modify\" button. \n To delete an entry press the \"Delete\" button.","Help Topic",JOptionPane.INFORMATION_MESSAGE);
// user clicks about option
if(arg.equals("About"))
JOptionPane.showMessageDialog(null,"Phonebook v 1.01 created by Yucca Nel.\nNo copyright exists.\nThis program is freeware and should not be sold.\nEnjoy :-)","About phonebook",JOptionPane.INFORMATION_MESSAGE);
// user clicks create button
if(arg.equals("Create"))
createNew();
// user clicks search button
if(arg.equals("Search"))
searchForName(arg, name); // Only possible to search by name as all contacts Must have a name
if(arg.equals("Modify"))
modifyContact(arg,name);
save();
// user clicks the sort by name option
if(arg.equals("Name"))
sort(name);
if(arg.equals("Surname"))
sort(surname);
} // end of actionPerformed()
// Method to ceate a new entry
public void createNew()
{ // start of createNew()
int newHome, newWork, newCell = 0;
String newContactName = JOptionPane.showInputDialog(null,"Please enter the new contacts first name or press cancel to exit.");
if(newContactName == null) finish(); // if user clicks cancel
if(newContactName.length() <=0)
JOptionPane.showMessageDialog(null,"You did not enter a valid name.\nPlease make sure you enter data correctly.","Error",JOptionPane.ERROR_MESSAGE);
createNew(); // To return to the create method
String newContactSurname = JOptionPane.showInputDialog(null,"Please enter the new contacts surname or press cancel to exit.");
if(newContactSurname == null) finish(); // if user clicks cancel
if(newContactSurname.equals(""))
int answer = JOptionPane.showConfirmDialog(null,"You did not enter a surname.\nAre you sure you wish to leave the surname empty?","No data entered",JOptionPane.YES_NO_OPTION); // Asks if data was valid
if(answer == JOptionPane.NO_OPTION)
newContactSurname = JOptionPane.showInputDialog(null,"Please enter the new contacts surname.");
String newContactWorkNum = JOptionPane.showInputDialog(null,"Please enter the new contacts work number or press cancel to exit.");
if(newContactWorkNum == null) finish(); // if user clicks cancel
String newContactHomeNum = JOptionPane.showInputDialog(null,"Please enter the new contacts home number or press cancel to exit.");
if(newContactHomeNum == null) finish(); // if user clicks cancel
String newContactCellNum = JOptionPane.showInputDialog(null,"Please enter the new contacts cell number or press cancel to exit.");
if(newContactCellNum == null) finish(); // if user clicks cancel
// enlarge the arrays so they can accept data
name = enlargeArray(name);
surname = enlargeArray(surname);
work = enlargeArray(work);
home = enlargeArray(home);
cell = enlargeArray(cell);
// add the new data into the arrays
name[name.length-1] = newContactName;
surname[surname.length-1] = newContactSurname;
home[home.length-1] = newContactHomeNum;
work[work.length-1] = newContactWorkNum;
cell[cell.length-1] = newContactCellNum;
// sort the names so they appear in alphebetical order
sort(name);
} // end of createNew()
// The enlarge array method
//method to enlarge an array by 1
public String[] enlargeArray(String[] currentArray)
String[] newArray = new String[currentArray.length + 1];
for (int i = 0; i < currentArray.length; i++)
newArray[i] = currentArray;
return newArray;
}// End of enlargeArray()
// The Sort Method
public void sort(String tempArray[])
{ // start of sort()
// for loop
for(int pass = 1; pass < tempArray.length; pass++)
for(int element = 0; element < tempArray.length -1; element++)
if(tempArray[element].compareTo(tempArray[element+1])>0)
swap(name, element, element+1);
swap(surname, element, element+1);
swap(home, element, element+1);
swap(work, element, element+1);
swap(cell, element, element+1);
addTextToTextPane();
} // end of sort()
// The swap method
public void swap(String swapArray[], int first, int second)
{ // start of swap()
String hold;
hold = swapArray[first];
swapArray[first] = swapArray[second];
swapArray[second] = hold;
} // end of swap()
// method to search for a name
public void searchForName(String searchField, String searchArray[])
{ // start of searchForName()
try
Document doc = displayPane.getDocument(); // assign text to an object
doc.remove(0,doc.getLength()); // clear the screen
doc.insertString(0,"NAME\tSURNAME\tHOME NO\tWORK NO\tCELL NO\n",displayPane.getStyle("bold"));
String searchValue = JOptionPane.showInputDialog(null,"Please enter the 1st name of the person you would like to see phone numbers for or press cancel to exit.");
boolean found = false;
if(searchValue == null) finish(); // if user clicks cancel
//search the array
for(int i=0; i < name.length; i++)
if(searchValue.compareTo(searchArray[i])==0)
doc.insertString(doc.getLength(), name[i] +"\t",displayPane.getStyle("regular"));
doc.insertString(doc.getLength(), surname[i] +"\t",displayPane.getStyle("regular"));
doc.insertString(doc.getLength(), home[i]+"\t",displayPane.getStyle("regular"));
doc.insertString(doc.getLength(), work[i]+"\t",displayPane.getStyle("regular"));
doc.insertString(doc.getLength(), cell[i]+"\t",displayPane.getStyle("regular"));
found = true;
if(found == false)
JOptionPane.showMessageDialog(null,"No contact with that name found.","No result found",JOptionPane.INFORMATION_MESSAGE);
sort(name);
catch(BadLocationException ble)
System.err.println("Could not insert text.");
} // end of searchForName()
// Method to modify contact
public void modifyContact(String searchField, String searchArray[])
{ // start of modifyContact()
try
Document doc = displayPane.getDocument(); // assign text to an object
doc.remove(0,doc.getLength()); // clear the screen
doc.insertString(0,"NAME\tSURNAME\tHOME NO\tWORK NO\tCELL NO\n",displayPane.getStyle("bold"));
String modifyValue = JOptionPane.showInputDialog(null,"Please enter the 1st name of the person you would like to change details for. Or press cancel to exit");
boolean found = false;
if(modifyValue == null) finish(); // if user clicks cancel
//search the array
for(int i=0; i < name.length; i++)
if(modifyValue.compareTo(searchArray[i])==0)
// To change the name
String oldName = name[i];
String newName = JOptionPane.showInputDialog(null,"Please enter a new name if you would like to change the name for "+name[i]+". Or press cancel to exit");
if(newName == null)
name[i] = oldName; // if user clicks cancel keep old entry
finish();
if(newName.equals("")) // if no data entered then name will stay same
JOptionPane.showMessageDialog(null,"You did not enter a name in the name field.\nOld name will be kept.","Information Message",JOptionPane.INFORMATION_MESSAGE);
name[i] = oldName;
addTextToTextPane();
else
name[i] = newName; // new name is saved into array
addTextToTextPane();
//To change the surname
String oldSurname = surname[i];
String newSurname = JOptionPane.showInputDialog(null,"Please enter a new surname if you would like to change the surname for "+name[i]+". Or press cancel to exit");
if(newSurname == null)
surname[i] = oldSurname; // if user clicks cancel keep old entry
finish();
if((oldSurname.length()>0) && newSurname.length()<=0) // if surname existed but no new surname was entered
int answer = JOptionPane.showConfirmDialog(null,"You are about to remove the surname for "+name[i]+".\nAre you sure you would like to remove the surname for this contact?","Please confirm the following",JOptionPane.YES_NO_OPTION);
if(answer == JOptionPane.YES_OPTION) // user wishes to remove old surname and leave no surname in place
surname[i] = newSurname; // new surname is saved into the array
else // user does not wish to remove surname
surname[i] = oldSurname; // keep the old surname
else // just replace the surname with new one as everything seems fine
surname[i] = newSurname;
//To change the work number of contact
String oldWork = work[i];
String newWork = JOptionPane.showInputDialog(null,"Please enter a new work number if you would like to change the work number for "+name[i]+". Or press cancel to exit");
if(newWork == null)
work[i] = oldWork; // user clicks cancel keep old entry
finish();
if((oldWork.length()>0) && newWork.length()<=0) // if number existed but no new number was entered
int answer = JOptionPane.showConfirmDialog(null,"You are about to remove the work number for "+name[i]+".\nAre you sure you would like to remove the work number for this contact?","Please confirm the following",JOptionPane.YES_NO_OPTION);
if(answer == JOptionPane.YES_OPTION) // user wishes to remove old number and leave no number in place
work[i] = newWork; // new number is saved into the array
else // user does not wish to remove number
work[i] = oldWork; // keep the old number
else // just replace the number with new one as everything seems fine
work[i] = newWork;
//To change the work number of contact
String oldHome = home[i];
String newHome = JOptionPane.showInputDialog(null,"Please enter a new home number if you would like to change the home number for "+name[i]+". Or press cancel to exit");
if(newHome == null)
home[i] = oldHome; // if user clicks cancel keep old value
finish();
if((oldHome.length()>0) && newHome.length()<=0) // if number existed but no new number was entered
int answer = JOptionPane.showConfirmDialog(null,"You are about to remove the home number for "+name[i]+".\nAre you sure you would like to remove the home number for this contact?","Please confirm the following",JOptionPane.YES_NO_OPTION);
if(answer == JOptionPane.YES_OPTION) // user wishes to remove old number and leave no number in place
home[i] = newHome; // new number is saved into the array
else // user does not wish to remove number
home[i] = oldHome; // keep the old number
else // just replace the number with new one as everything seems fine
home[i] = newHome;
//To change the cell number
String oldCell = cell[i];
String newCell = JOptionPane.showInputDialog(null,"Please enter a new cell number if you would like to change the cell number for "+name[i]+". Or press cancel to exit");
if(newCell == null)
cell[i] = oldCell; // if user clicks cancel keep old value
finish();
if((oldCell.length()>0) && newCell.length()<=0) // if number existed but no new number was entered
int answer = JOptionPane.showConfirmDialog(null,"You are about to remove the Cell number for "+name[i]+".\nAre you sure you would like to remove the cell number for this contact?","Please confirm the following",JOptionPane.YES_NO_OPTION);
if(answer == JOptionPane.YES_OPTION) // user wishes to remove old number and leave no number in place
cell[i] = newCell; // new number is saved into the array
else // user does not wish to remove number
cell[i] = oldCell; // keep the old number
else // just replace the number with new one as everything seems fine
cell[i] = newCell;
found = true;
addTextToTextPane();
if(found == false)
JOptionPane.showMessageDialog(null,"No contact with that name found.","No result found",JOptionPane.INFORMATION_MESSAGE);
sort(name);
addTextToTextPane();
catch(BadLocationException ble)
System.err.println("Could not insert text.");
} // end of searchForName()
// finish method for cancel button
public void finish()
JOptionPane.showMessageDialog(null,"This program will now close and automatically save all data entered. You may restart the program to modify any changes.","Information Message",JOptionPane.INFORMATION_MESSAGE);
System.exit(0);
// method to save data to file
public void save()
try
for(int i=0; i < name.length; i++)
output.writeUTF(name[i]);
output.writeUTF(surname[i]);
output.writeUTF(work[i]);
output.writeUTF(home[i]);
output.writeUTF(cell[i]);
JOptionPane.showMessageDialog(null,"Data succesfully saved to file.","Information message",JOptionPane.INFORMATION_MESSAGE);
catch(IOException io)
System.exit(1);
public static void main(String[] args)
{ // start of main()
// Set look and feel of interface
try
{ // start of try block
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} // end of try block
catch(Exception e)
{ // start of catch block
JOptionPane.showMessageDialog(null,"There was an error in setting the look and feel of this application","Error",JOptionPane.INFORMATION_MESSAGE);
} // end of catch block
ContactsListInterface cli = new ContactsListInterface();
cli.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
cli.setJMenuBar(cli.createMenuBar());
cli.setContentPane(cli.createContentPane());
cli.setSize(520,500);
cli.setVisible(true);
cli.setResizable(false);
} // end of main()
} //end of classBefore thinking I am lazy I dont want you to correct my code. Just give me a few pointers on how to get my arrays back from the file and how to set my strings to a non null value that wont show when my program starts.
Edited by: Yucca on Mar 24, 2008 7:24 PMYucca wrote:
It's pretty easy to write objects to file, but it depends on what you want to do with that file. Do you want it to be a human-readable text file? Is it only to be used by your program? The file is to be used by my program to save to and to read from. But I understand now that saving each entry as a string and not writing it to an array may be easier. Do I use the buffered reader instead of InputStreamReader? Oh sorry I forgot to mention that the file I save to will later be used when I convert my application to a database type/SQL tyype aplication.
Edited by: Yucca on Mar 24, 2008 8:06 PMIt sounds to me like object serialization would be the easiest for what you want to do. Read through this:
http://java.sun.com/developer/technicalArticles/Programming/serialization/
And these apis:
http://java.sun.com/j2se/1.5.0/docs/api/java/io/ObjectOutputStream.html
http://java.sun.com/j2se/1.5.0/docs/api/java/io/ObjectInputStream.html -
Can someone pls help me with this code
The method createScreen() creates the first screen wherein the user makes a selection if he wants all the data ,in a range or single data.The problem comes in when the user makes a selection of single.that then displays the singleScreen() method.Then the user has to input a key data like date or invoice no on the basis of which all the information for that set of data is selected.Now if the user inputs a wrong key that does not exist for the first time the program says invalid entry of data,after u click ok on the option pane it prompts him to enter the data again.But since then whenever the user inputs wrong data the program says wrong data but after displaying the singlescreen again does not wait for input from the user it again flashes the option pane with the invalid entry message.and this goes on doubling everytime the user inputs wrong data.the second wrong entry of data flashes the error message twice,the third wrong entry flashes the option pane message 4 times and so on.What actually happens is it does not wait at the singlescreen() for user to input data ,it straight goes into displaying the JOptionPane message for wrong data entry so we have to click the optiion pane twice,four times and so on.
Can someone pls help me with this!!!!!!!!!
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.text.*;
import java.util.*;
public class MainMenu extends JFrame implements ActionListener,ItemListener{
//class
FileReaderDemo1 fd=new FileReaderDemo1();
FileReaderDemo1 fr;
Swing1Win sw;
//primary
int monthkey=1,counter=0;
boolean flag=false,splitflag=false;
String selection,monthselection,dateselection="01",yearselection="00",s,searchcriteria="By Date",datekey,smonthkey,invoiceno;
//arrays
String singlesearcharray[];
String[] monthlist={"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sept","Oct","Nov","Dec"};
String[] datelist=new String[31];
String[] yearlist=new String[100];
String[] searchlist={"By Date","By Invoiceno"};
//collection
Hashtable allinvoicesdata=new Hashtable();
Vector data=new Vector();
Enumeration keydata;
//components
JButton next=new JButton("NEXT>>");
JComboBox month,date,year,search;
JLabel bydate,byinvno,trial;
JTextField yeartext,invtext;
JPanel panel1,panel2,panel3,panel4;
JRadioButton single,range,all;
ButtonGroup group;
JButton select=new JButton("SELECT");
//frame and layout declarations
JFrame jf;
Container con;
GridBagLayout gridbag=new GridBagLayout();
GridBagConstraints gc=new GridBagConstraints();
//constructor
MainMenu(){
jf=new JFrame();
con=getContentPane();
con.setLayout(null);
fr=new FileReaderDemo1();
createScreen();
setSize(500,250);
setLocation(250,250);
setVisible(true);
//This is thefirst screen displayed
public void createScreen(){
group=new ButtonGroup();
single=new JRadioButton("SINGLE");
range=new JRadioButton("RANGE");
all=new JRadioButton("ALL");
search=new JComboBox(searchlist);
group.add(single);
group.add(range);
group.add(all);
single.setBounds(100,50,100,20);
search.setBounds(200,50,100,20);
range.setBounds(100,90,100,20);
all.setBounds(100,130,100,20);
select.setBounds(200,200,100,20);
con.add(single);
con.add(search);
con.add(range);
con.add(all);
con.add(select);
search.setEnabled(false);
single.addItemListener(this);
search.addActionListener(new MyActionListener());
range.addItemListener(this);
all.addItemListener(this);
select.addActionListener(this);
public class MyActionListener implements ActionListener{
public void actionPerformed(ActionEvent a){
JComboBox cb=(JComboBox)a.getSource();
if(a.getSource().equals(month))
monthkey=((cb.getSelectedIndex())+1);
if(a.getSource().equals(date)){
dateselection=(String)cb.getSelectedItem();
if(a.getSource().equals(year))
yearselection=(String)cb.getSelectedItem();
if(a.getSource().equals(search)){
searchcriteria=(String)cb.getSelectedItem();
public void itemStateChanged(ItemEvent ie){
if(ie.getItem()==single){
selection="single";
search.setEnabled(true);
else if (ie.getItem()==all){
selection="all";
search.setEnabled(false);
else if (ie.getItem()==range){
search.setEnabled(false);
public void actionPerformed(ActionEvent ae){
if(ae.getSource().equals(select))
if(selection.equals("single")){
singleScreen();
if(selection.equals("all"))
sw=new Swing1Win();
if(ae.getSource().equals(next)){
if(monthkey<9)
smonthkey="0"+monthkey;
System.out.println(smonthkey+"/"+dateselection+"/"+yearselection+"it prints this");
allinvoicesdata=fr.read(searchcriteria);
if (searchcriteria.equals("By Date")){
System.out.println("it goes in this");
singleinvoice(smonthkey+"/"+dateselection+"/"+yearselection);
else if (searchcriteria.equals("By Invoiceno")){
invoiceno=invtext.getText();
singleinvoice(invoiceno);
if (flag == false){
System.out.println("flag is false");
singleScreen();
else{
System.out.println("its in here");
singlesearcharray=new String[data.size()];
data.copyInto(singlesearcharray);
sw=new Swing1Win(singlesearcharray);
public void singleinvoice(String searchdata){
keydata=allinvoicesdata.keys();
while(keydata.hasMoreElements()){
s=(String)keydata.nextElement();
if(s.equals(searchdata)){
System.out.println(s);
flag=true;
break;
if (flag==true){
System.out.println("vector found");
System.exit(0);
data= ((Vector)(allinvoicesdata.get(s)));
else{
JOptionPane.showMessageDialog(jf,"Invalid entry of date : choose again");
public void singleScreen(){
System.out.println("its at the start");
con.removeAll();
SwingUtilities.updateComponentTreeUI(con);
con.setLayout(null);
counter=0;
panel2=new JPanel(gridbag);
bydate=new JLabel("By Date : ");
byinvno=new JLabel("By Invoice No : ");
dateComboBox();
invtext=new JTextField(6);
gc.gridx=0;
gc.gridy=0;
gc.gridwidth=1;
gridbag.setConstraints(month,gc);
panel2.add(month);
gc.gridx=1;
gc.gridy=0;
gridbag.setConstraints(date,gc);
panel2.add(date);
gc.gridx=2;
gc.gridy=0;
gc.gridwidth=1;
gridbag.setConstraints(year,gc);
panel2.add(year);
bydate.setBounds(100,30,60,20);
con.add(bydate);
panel2.setBounds(170,30,200,30);
con.add(panel2);
byinvno.setBounds(100,70,100,20);
invtext.setBounds(200,70,50,20);
con.add(byinvno);
con.add(invtext);
next.setBounds(300,200,100,20);
con.add(next);
if (searchcriteria.equals("By Invoiceno")){
month.setEnabled(false);
date.setEnabled(false);
year.setEnabled(false);
else if(searchcriteria.equals("By Date")){
byinvno.setEnabled(false);
invtext.setEnabled(false);
monthkey=1;
dateselection="01";
yearselection="00";
month.addActionListener(new MyActionListener());
date.addActionListener(new MyActionListener());
year.addActionListener(new MyActionListener());
next.addActionListener(this);
invtext.addKeyListener(new KeyAdapter(){
public void keyTyped(KeyEvent ke){
char c=ke.getKeyChar();
if ((c == KeyEvent.VK_BACK_SPACE) ||(c == KeyEvent.VK_DELETE)){
System.out.println(counter+"before");
counter--;
System.out.println(counter+"after");
else
counter++;
if(counter>6){
System.out.println(counter);
counter--;
ke.consume();
else
if(!((Character.isDigit(c) || (c == KeyEvent.VK_BACK_SPACE) || (c == KeyEvent.VK_DELETE)))){
getToolkit().beep();
counter--;
JOptionPane.showMessageDialog(null,"please enter numerical value");
ke.consume();
System.out.println("its at the end");
public void dateComboBox(){
for (int counter=0,day=01;day<=31;counter++,day++)
if(day<=9)
datelist[counter]="0"+String.valueOf(day);
else
datelist[counter]=String.valueOf(day);
for(int counter=0,yr=00;yr<=99;yr++,counter++)
if(yr<=9)
yearlist[counter]="0"+String.valueOf(yr);
else
yearlist[counter]=String.valueOf(yr);
month=new JComboBox(monthlist);
date=new JComboBox(datelist);
year=new JComboBox(yearlist);
public static void main(String[] args){
MainMenu mm=new MainMenu();
public class WindowHandler extends WindowAdapter{
public void windowClosing(WindowEvent we){
jf.dispose();
System.exit(0);
}Hi,
I had a similar problem with a message dialog. Don't know if it is a bug, I was in a hurry and had no time to search the bug database... I found a solution by using keyPressed() and keyReleased() instead of keyTyped():
private boolean pressed = false;
public void keyPressed(KeyEvent e) {
pressed = true;
public void keyReleased(KeyEvent e) {
if (!pressed) {
e.consume();
return;
// Here you can test whatever key you want
//...I don't know if it will help you, but it worked for me.
Regards. -
Help needed with if statement in a method
Hi I�ve created 2 string arrays. One holds a one digit user id no. and the other holds a 4 digit pin number. I�ve then written a method which should take the userId no that has been sent to the method in the UserCode parameter find the same number in the custid array if it does it should then check the same position of the pin array and check that the pin number matches the pin no. the method has received in PINCode parameter.
At the moment my method receives the parameters checks the userId no. but doesn�t move on and check the PIN array.
Any help would be great as I�ve been staring at this for days now and I can�t see the wood from the trees!
public boolean checkPinAndUserId(String pinCode, String userCode)
boolean found = false;
for (int i = 0; i < userId.length; i++)
if (userCode.equals(userId))
if (pinCode.equals(pin[i]))
found = true;
return found;I've posted my code in full so hopefully everyone can see exactly what I have been doing.
Note - my code uses the observer/observable model. The method I am having the problem with the if statement is in the class HSBC as are the string arrays. in the class ATM in the action performed PINInput button events section, when the pin count reaches 4 it sends the parameters over to the HSBC checkpin&userid method.
I've used the System.out.println() statements to see what's going on and it receives the parameters checkes the userid array but does not move on to check that the pin parameter matches the pin array?
Any help would be great - Hope this helps.
* @(#)BankAssignment.java 1.0 03/04/06
* This apllication l
package myprojects.bankassignment;
import java.awt.*; // import the component library
import java.awt.event.*; // import the evnet library
import javax.swing.*;
import java.util.*;
class Correct1v16 extends Frame // make a new application
public Correct1v16() // this is the constructor method
HSBC HSBCobj = new HSBC();
public static void main(String args[]) // this invokes the constructor of the class and creates a runable object 'mainframe'
Correct1v16 mainFrame = new Correct1v16(); // the constructor call of the class which creates an object of that class
class HSBC implements Observer, ActionListener
Frame f5;
JLabel refill, launch;
TextField tRefill, tLaunch;
JButton refillbut, launchbut;
int count;
String [] userId=new String [10];
String [] pin=new String [10];
public boolean authenticate = false;
int i;
public HSBC()
drawFrame();
Atm Atmobj = new Atm(this);
System.out.println("Starting HSBC constructor");
public void drawFrame()
System.out.println("Start HSBC drawframe method...");
f5=new Frame("HSBC");
f5.setLayout(new FlowLayout());
f5.setSize(200, 200);
f5.addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent e)
f5.dispose();
System.exit(0);
refill=new JLabel("Refill ATM");
launch=new JLabel("Launch new ATM");
tRefill=new TextField(20);
tLaunch=new TextField(10);
refillbut=new JButton("Refill ATM");
refillbut.addActionListener(this);
launchbut=new JButton("Launch new ATM");
launchbut.addActionListener(this);
f5.add(refill);
f5.add(tRefill);
f5.add(refillbut);
f5.add(launch);
f5.add(tLaunch);
f5.add(launchbut);
f5.setVisible(true);
//*********** POPULATE THE ARRAYS */
pin[0]="1234";
pin[1]="2345";
pin[2]="3456";
pin[3]="4567";
pin[4]="5678";
pin[5]="6789";
pin[6]="7890";
pin[7]="8901";
pin[8]="9012";
pin[9]="0123";
userId[0]="0";
userId[1]="1";
userId[2]="2";
userId[3]="3";
userId[4]="4";
userId[5]="5";
userId[6]="6";
userId[7]="7";
userId[8]="8";
userId[9]="9";
}// end drawframe method
// public Atm atmLink = (Atm)o;
public void update(Observable gm1, Object o)
Atm atmLink = (Atm)o;
tRefill.setText("Refill ATM ?");
atmLink.refill();
}//end update method
public void actionPerformed(ActionEvent ae)
if(ae.getSource() == refillbut)
// Atm Atmobj.refill();
// tRefill.setText("text area");
// atmLink.refill();
// Atmobj.refill();
// setChanged();
// notifyObservers();
if(ae.getSource() == launchbut)
tLaunch.setText("new ATM opened");
Atm Atmobj1 = new Atm(this);
//******** THIS METHOD RECEIVES THE PARAMETERS FROM THE ATM METHOD (LINE 580) (PINCODE AND USERCODE) BUT
//******** IT ONLY THE ARRAY CALLED USERID (WHICH HOLDS THE USER CODE MATCHES ONE OF THE USERID'S)
//******** I DO WANT IT TO DO THIS BUT I ALSO WANT IT TO MOVE ON AND CHECK THE PINCODE WITH THE PIN ARRAY)
//******** IF THEY ARE BOTH TRUE I WANT IT TO RETURN TRUE - ELSE FALSE. */
public boolean checkPinAndUserId(String pinCode, String userCode)
boolean found = false;
System.out.println("in checkpin method");
for (int i = 0; i < userId.length; i++)
System.out.println("in the userid array" + userId);
if (userCode.equals(userId[i]))
System.out.println("checking user code array");
if (pinCode.equals(pin[i]))
System.out.println("checking the pin array" + pinCode);
System.out.println("pin[i] = "+pin[i]);
found = true;
return found;
}// end HSBC class
class Atm extends Observable implements ActionListener
Frame f1;
TextField t3, t5;
JTextArea display = new JTextArea("Welcome to HSBC Bank. \n Please enter your User Identification number \n", 5, 40);
JPanel p1, p2, p3,p4;
private JButton but1, but2, but3, but4,but5,but6,but7,but8,but9,but0,enter,
cancel,fivepounds,tenpounds,twentypounds,fiftypounds,clearbut, refillbut;
int state = 1;
public String pinCode ="";
public String userCode ="";
int userCodeCount = 0;
int PINCount = 0;
String withdrawAmount = "";
int atmBalance =200;
private HSBC HSBCobj;
//ATM constructor that receives the HSBCobj g1 reference to where the HSBC class
// in in the program
// Calls the drawATMFrame method
// add the observer to the HSBCobj reference so that the ATM can tell HSBC that
// something has changed
public Atm(HSBC g1)
HSBCobj = g1;
drawATMFrame();
System.out.println("Starting Atm constructor");
addObserver(HSBCobj);
// this is the method that draws the ATM interface
// also apply the Border Layout to the frame
public void drawATMFrame()
f1=new Frame("ATM");
f1.setLayout(new BorderLayout());
f1.setSize(350, 250);
f1.addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent e)
f1.dispose();
System.exit(0);
// declare & instantiate all the buttons that will be used on the ATM
but1 =new JButton("1");
but1.addActionListener(this);
but2 =new JButton("2");
but2.addActionListener(this);
but3 =new JButton("3");
but3.addActionListener(this);
but4 =new JButton("4");
but4.addActionListener(this);
but5 =new JButton("5");
but5.addActionListener(this);
but6 =new JButton("6");
but6.addActionListener(this);
but7 =new JButton("7");
but7.addActionListener(this);
but8 =new JButton("8");
but8.addActionListener(this);
but9 =new JButton("9");
but9.addActionListener(this);
but0 =new JButton("0");
but0.addActionListener(this);
enter=new JButton("Enter");
enter.addActionListener(this);
cancel=new JButton("Cancel/ \n Restart");
cancel.addActionListener(this);
fivepounds =new JButton("?5");
fivepounds.addActionListener(this);
tenpounds = new JButton("?10");
tenpounds.addActionListener(this);
twentypounds = new JButton("?20");
twentypounds.addActionListener(this);
fiftypounds = new JButton("?50");
fiftypounds.addActionListener(this);
clearbut = new JButton("Clear");
clearbut.addActionListener(this);
refillbut = new JButton("Refill");
refillbut.addActionListener(this);
//declare & instantiate a textfield
t3=new TextField(5);
// instantiate 4 JPanels
p1=new JPanel();
p2=new JPanel();
p3=new JPanel();
p4=new JPanel();
// add some buttons to p1
p1.add(but1);
p1.add(but2);
p1.add(but3);
p1.add(but4);
p1.add(but5);
p1.add(but6);
p1.add(but7);
p1.add(but8);
p1.add(but9);
p1.add(but0);
//add the text area field to p2
p2.add(display);
// apply the grid layout to p3
GridLayout layout3 = new GridLayout(4,1,5,5);
p3.setLayout(layout3);
p3.add(fivepounds);
p3.add(tenpounds);
p3.add(twentypounds);
p3.add(fiftypounds);
// apply grid layout to p4
GridLayout layout4 = new GridLayout(4,1,5, 5);
p4.setLayout(layout4);
p4.add(clearbut);
p4.add(enter);
p4.add(cancel);
p4.add(refillbut);
//add the panels to the different parts of the screen
f1.add("North", display);
f1.add("Center", p1);
f1.add("East", p4);
f1.add("West", p3);
f1.setVisible(true);
}// end drawATMframe method
public void actionPerformed(ActionEvent ae)
if(state == 1)
getUserIdNo(ae);
else if(state == 2)
doPINInput(ae);
else
withdrawCash(ae);
}// end action performed method
//******** STATE 1 events
//******** USER ID INPUT
public void getUserIdNo (ActionEvent ae)
if (ae.getSource() == but1)
display.append("*");
userCode = userCode + "1";
userCodeCount++;
if (ae.getSource() == but2)
display.append("*");
userCode = userCode + "2";
userCodeCount++;
if (ae.getSource() == but3)
display.append("*");
userCode = userCode + "3";
userCodeCount++;
System.out.println("user id ="+userCode);
if (ae.getSource() == but4)
display.append("*");
userCode = userCode = "4";
userCodeCount++;
System.out.println("user id ="+userCode);
if (ae.getSource() == but5)
display.append("*");
userCode = userCode + "5";
userCodeCount++;
System.out.println("user id ="+userCode);
if (ae.getSource() == but6)
display.append("*");
userCode = userCode + "6";
userCodeCount++;
System.out.println("user id ="+userCode);
if (ae.getSource() == but7)
display.append("*");
userCode = userCode + "7";
userCodeCount++;
System.out.println("user id ="+userCode);
if (ae.getSource() == but8)
display.append("*");
userCode = userCode + "8";
userCodeCount++;
System.out.println("user id ="+userCode);
if (ae.getSource() == but9)
display.append("*");
userCode = userCode + "9";
userCodeCount++;
System.out.println("user id ="+userCode);
if (ae.getSource() == but0)
display.append("*");
userCode = userCode + "0";
userCodeCount++;
System.out.println("user id ="+userCode);
if (ae.getSource() == cancel)
display.setText("Welcome to HSBC Bank.\n Please enter your User Identification number \n");
userCode = "";
state = 2;
if (ae.getSource() == clearbut)
display.setText("Please enter your user ID number again\n");
userCode = "";
userCodeCount = 0;
if (ae.getSource() == refillbut)
refill();
if (ae.getSource() == enter)
display.setText("Please enter your PIN \n");
state = 2;
System.out.println(" User id enter button = " + userCode);
if (userCodeCount == 1)
display.setText("Please enter your PIN \n");
userCode = "";
userCodeCount = 0;
state = 2;
//******** STATE 2
//******** PIN INPUT
public void doPINInput(ActionEvent ae)
if (ae.getSource() == but1)
{ pinCode = pinCode.concat("1");
display.append("*");
PINCount++;
if (ae.getSource() == but2)
{ pinCode = pinCode.concat("2");
display.append("*");
PINCount++;
if (ae.getSource() == but3)
{ pinCode = pinCode.concat("3");
display.append("*");
PINCount++;
if (ae.getSource() == but4)
{ pinCode = pinCode.concat("4");
display.append("*");
PINCount++;
if (ae.getSource() == but5)
{ pinCode = pinCode.concat("5");
display.append("*");
PINCount++;
if (ae.getSource() == but6)
{ pinCode = pinCode.concat("6");
display.append("*");
PINCount++;
if (ae.getSource() == but7)
{ pinCode = pinCode.concat("7");
display.append("*");
PINCount++;
if (ae.getSource() == but8)
{ pinCode = pinCode.concat("8");
display.append("*");
PINCount++;
if (ae.getSource() == but9)
{ pinCode = pinCode.concat("9");
display.append("*");
PINCount++;
if (ae.getSource() == but0)
{ pinCode = pinCode.concat("0");
display.append("*");
PINCount++;
if (ae.getSource() == clearbut)
display.setText("Please enter your PIN number again \n");
pinCode = "";
PINCount = 0;
if (ae.getSource() == cancel)
display.setText("Welcome to HSBC Bank.\n Please enter your User Identification number \n");
state = 1;
pinCode ="";
PINCount = 0;
if (ae.getSource() == refillbut)
refill();
/// ************************ THIS BUTTON SENDS THE PIN & USER CODE OVER TO THE MAIN BANK
/// ************************ (LINE 152)
if (ae.getSource() == enter)
// if(HSBCobj.checkPinAndUserId(pinCode, userCode))
// display.setText("How much would you like to withdraw \n");
// else
// display.setText("Your UserId and Pin code do not match");
if(PINCount ==4)
if(HSBCobj.checkPinAndUserId(userCode,pinCode))
display.setText("Enter the amount you \n want to withdraw \n ?");
PINCount=0;
else
display.setText("Your User Identification Number \n and PIN number do not match! \n please try again\n");
//*********** STATE 3 events
//*********** withdrawCash
public void withdrawCash(ActionEvent ae)
// if (ae.getSource() == but1)
// display.append("1");
/// withdrawAmount = withdrawAmount+1;
// pinCode = pinCode.concat("2");
// System.out.println("Withdrawal Amount = "+withdrawAmount);
if(ae.getSource( ) == but1)
withdrawAmount = withdrawAmount + "1";
display.setText(withdrawAmount);
if(ae.getSource( ) == but2)
withdrawAmount = withdrawAmount + "2";
display.setText(withdrawAmount);
if(ae.getSource( ) == but3)
withdrawAmount = withdrawAmount + "3";
display.setText(withdrawAmount);
if(ae.getSource( ) == but4)
withdrawAmount = withdrawAmount + "4";
display.setText(withdrawAmount);
if(ae.getSource( ) == but5)
withdrawAmount = withdrawAmount + "5";
display.setText(withdrawAmount);
if(ae.getSource( ) == but6)
withdrawAmount = withdrawAmount + "6";
display.setText(withdrawAmount);
if(ae.getSource( ) == but7)
withdrawAmount = withdrawAmount + "7";
display.setText(withdrawAmount);
if(ae.getSource( ) == but8)
withdrawAmount = withdrawAmount + "8";
display.setText(withdrawAmount);
if(ae.getSource( ) == but9)
withdrawAmount = withdrawAmount + "9";
display.setText(withdrawAmount);
if(ae.getSource( ) == but0)
withdrawAmount = withdrawAmount + "0";
display.setText(withdrawAmount);
if (ae.getSource() == fivepounds)
withdrawAmount = withdrawAmount + "5";
display.setText(withdrawAmount);
atmBalance();
if (ae.getSource() == tenpounds)
withdrawAmount = withdrawAmount + "10";
display.setText(withdrawAmount);
atmBalance();
if (ae.getSource() == twentypounds)
withdrawAmount = withdrawAmount + "20";
display.setText(withdrawAmount);
atmBalance();
if (ae.getSource() == fiftypounds)
withdrawAmount = withdrawAmount + "50";
display.setText(withdrawAmount);
atmBalance();
// if (ae.getSource() == tenpounds)
// display.append("10");
// withdrawAmount = 10;
// pinCode = pinCode.concat("2");
// System.out.println("10 pound button pressed");
// atmBalance();
if (ae.getSource() == enter)
atmBalance();
if (ae.getSource() == refillbut)
System.out.println("refill but pressed");
refill();
if (ae.getSource() == clearbut)
System.out.println("clear but pressed");
display.setText("Enter the amount you want to withdraw \n ?");
withdrawAmount="";
if (ae.getSource() == cancel)
display.setText("Welcome to HSBC Bank.\n Please enter your User Identification number \n");
withdrawAmount="";
pinCode ="";
PINCount = 0;
userCode = "";
userCodeCount = 0;
state = 1;
}// end withdraw cash input method
// checks balace of atm and withdraws cash. Also notifies onserver if atm balance is low
public void atmBalance()
String s = withdrawAmount;
int n = Integer.parseInt(s);
if ( atmBalance >= n)
atmBalance = atmBalance - n;
System.out.println("atm balance = "+ atmBalance);
display.setText("Thankyou for using HSBC. \nYou have withdrawn ?"+n);
if (atmBalance<40)
System.out.println("atm balance is less than 40 - notify HSBC" );
setChanged();
notifyObservers(this);
/// note the refil should send a message to the controller
// advising a refil is needed. The Bank will send an engineer
// out who will fill the atm up
}// end atmBalance method
/// note the refil should send a message to the controller
/// then th coontroller will send a message to this method to fill machine
/// (this is simulating a clerk filling atm)
public void refill()
System.out.println("in refill method" );
atmBalance = 200;
System.out.println("Atm has been refilled. Atm balance = " + atmBalance);
// setChanged();
// notifyObservers(this);
}// end refill method
// NOTE SURE ABOUT THIS - DO I USE THE UPDATE METHOD TO NOTIFY HSBC THAT ATM REQUIRES FILLING
// THIS IS THE WRONG PART OF THE PROGRAM (SHOULD BE IN HSBC) - IGNORE
public void update(Observable gm1, Object gameObj)
display.setText("Congratulations");
}//end update method
}// end Atm method
}// end Assignment2 class -
Need help with Math related operations...
I'm learning JAVA for more than 3 weeks and I really need help...
I'm using SDK1.4 with Elixir IDE Lite (+patch installed).
In the following screenshot <http://www.geocities.com/jonny_fyy/pics/java1.png>, I've got this error (when I right-click -> Compile) . Do you know what it means & how can I solve it?
Here's how it should look if correct (pic scan from lab worksheet)... <http://www.geocities.com/jonny_fyy/pics/lab.jpg>
Here's my java file... <http://www.geocities.com/jonny_fyy/FahToCeltxt.java>
Thanks for helping :>Hi jonny
One step ahead:
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class FahToCeltxt extends Applet implements ActionListener {
TextField msgField ;
String msg = null;
int msgValue;
Label title;
Button b;
public void init() {
title = new Label("Enter degrees in Fahrenheit: ");
add(title);
msgField = new TextField (10);
add(msgField);
// msgField.addTextListener(this);
b = new Button("Convert");
b.addActionListener(this);
add(b);
// public void textValueChanged(TextEvent event) {
// msgValue = Integer.parseInt(msgField.getText());
// repaint();
public void paint (Graphics g) {
int result = (msgValue - 32) * 5/9 ;
g.drawString("Degree Centigrade is " + result , 50, 50);
public void actionPerformed(ActionEvent e) {
msgValue = Integer.parseInt(msgField.getText());
repaint();
}Regards. -
Help with playing sound in applications
im new to java and i was practicing playing sound in a swing application but the problem is that when i press the play button no sound is played...here is my code
import javax.swing.*;
import java.applet.AudioClip;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.MalformedURLException;
import java.net.URL;
import java.io.File;
public class JukeBox extends JFrame {
private JLabel label;
private JPanel panel, buttonPanel;
private JComboBox playList;
private JButton play, stop;
private URL url1, url2, url3, url4, url5, url6;
private AudioClip[] musicList;
private AudioClip current ;
public JukeBox() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(500, 120);
setLocation(50, 50);
setTitle("JAVA JukeBox");
url1 = url2 = url3 = url4 = url5 = url6 = null;
current = null;
try {
url1 = new URL("file", "localhost", "C:\\Documents and Settings\\KADA\\IdeaProjects\\Sound\\bottle-open.wav");
url2 = new URL("file", "localhost", "C:\\Documents and Settings\\KADA\\IdeaProjects\\Sound\\BP2.mp3");
url3 = new URL("file", "localhost", "C:\\Documents and Settings\\KADA\\IdeaProjects\\Sound\\fhm.aiff");
url4 = new URL("file", "localhost", "C:\\Documents and Settings\\KADA\\IdeaProjects\\Sound\\jungle.rmf");
url5 = new URL("file", "localhost", "C:\\Documents and Settings\\KADA\\IdeaProjects\\Sound\\spacemusic.au");
url6 = new URL("file", "localhost", "C:\\Documents and Settings\\KADA\\IdeaProjects\\Sound\\trippygaia.mid");
} catch (MalformedURLException e) {
e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
musicList = new AudioClip[7];
musicList[0] = null;
musicList[1] = JApplet.newAudioClip(url1);
musicList[2] = JApplet.newAudioClip(url2);
musicList[3] = JApplet.newAudioClip(url3);
musicList[4] = JApplet.newAudioClip(url4);
musicList[5] = JApplet.newAudioClip(url5);
musicList[6] = JApplet.newAudioClip(url6);
label = new JLabel("JAVA JukeBox", JLabel.CENTER);
String[] musicList = {"select a track..."
, "bottle open"
, "bitch please II"
, "flutte, harmonica, mambo"
, "jungle"
, "spacemusic"
, "trippygaia"};
playList = new JComboBox(musicList);
playList.addActionListener(new ListListener());
play = new JButton("Play");
play.setActionCommand("play");
play.addActionListener(new ButtonListener());
stop = new JButton("Stop");
stop.addActionListener(new ButtonListener());
buttonPanel = new JPanel();
buttonPanel.setLayout(new BoxLayout(buttonPanel, BoxLayout.X_AXIS));
buttonPanel.add(play);
buttonPanel.add(stop);
panel = new JPanel();
panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
panel.add(label);
panel.add(Box.createRigidArea(new Dimension(0, 5)));
panel.add(playList);
panel.add(Box.createRigidArea(new Dimension(0, 5)));
panel.add(buttonPanel);
getContentPane().add(panel);
private class ButtonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
if(current != null){
current.stop();
if(e.getActionCommand().equalsIgnoreCase("play")){
if(current != null){
current.play();
private class ListListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
if (current != null) {
current.stop();
current = musicList[playList.getSelectedIndex()];
public static void main(String[] args) {
setDefaultLookAndFeelDecorated(true);
JukeBox jb = new JukeBox();
jb.setVisible(true);
jb.setResizable(false);
}can u please tell me whats wrong with my code coz i cant hear no sound when i press the play button and can u please tell me why i cant simply put the file name in the URL instead of the complete path although the files are in the same directory of the source code and can i play mp3 using this little program ???
plz help...im a newbie so plz explain as much as u can...After
musicList = new AudioClip[7];
musicList[0] = null;
musicList[1] = JApplet.newAudioClip(url1);
musicList[2] = JApplet.newAudioClip(url2);
musicList[3] = JApplet.newAudioClip(url3);
musicList[4] = JApplet.newAudioClip(url4);
musicList[5] = JApplet.newAudioClip(url5);
musicList[6] = JApplet.newAudioClip(url6);initialise the variable current with
current = musicList[1];or similar because the AudioClip current always == null in your code so your listener blocks don`t execute.
regards -
Help with if statement for a beginner.
Hello, Im new to the dev lark and wondered if someone could point me in the right direction.
I have the following (working!) app that lets users press a few buttons instead of typing console commands (please do not be too critical of it, its my first work prog).
//DBS File send and Receive app 1.0
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import java.applet.Applet;
public class Buttons extends JFrame
public Buttons()
super("DBS 2");
JTextArea myText = new JTextArea ("Welcome to the DBS application." +
"\n" +
"\n\n1. If you have received an email informing you that the DBS is ready to dowload please press the \"Receive DBS\" button." +
"\n" +
"\n1. Once this has been Received successfully please press the \"Prep File\" button." +
"\n\n2. Once the files have been moved to their appropriate locations, please do the \"Load\" into PAS." +
"\n\n3. Once the \"Load\" is complete, do the \"Extract\"." +
"\n\n4. When the \"Extract\" has taken place please press the \"File Shuffle\" button." +
"\n\n5. When the files have been shuffled, please press the \"Send DBS\" Button." +
"\n\nJob done." +
"\n", 20,50);
JPanel holdAll = new JPanel();
JPanel topPanel = new JPanel();
JPanel bottomPanel = new JPanel();
JPanel middle1 = new JPanel();
JPanel middle2 = new JPanel();
JPanel middle3 = new JPanel();
topPanel.setLayout(new FlowLayout());
middle1.setLayout(new FlowLayout());
middle2.setLayout(new FlowLayout());
middle3.setLayout(new FlowLayout());
bottomPanel.setLayout(new FlowLayout());
myText.setBackground(new java.awt.Color(0, 0, 0));
myText.setForeground(new java.awt.Color(255,255,255));
myText.setFont(new java.awt.Font("Times",0, 16));
myText.setLineWrap(true);
myText.setWrapStyleWord(true);
holdAll.setLayout(new BorderLayout());
topPanel.setBackground(new java.awt.Color(153, 101, 52));
bottomPanel.setForeground(new java.awt.Color(153, 0, 52));
holdAll.add(topPanel, BorderLayout.CENTER);
topPanel.add(myText, BorderLayout.NORTH);
setSize(700, 600);
setDefaultCloseOperation(EXIT_ON_CLOSE);
getContentPane().add(holdAll, BorderLayout.CENTER);
Container c = getContentPane();
c.setLayout(new FlowLayout());
final JButton receiveDBS = new JButton("Receive DBS"); //marked as final as it is called in an Inner Class later
final JButton filePrep = new JButton("Prep File");
final JButton fileShuffle = new JButton("File Shuffle");
final JButton sendDBS = new JButton("Send DBS");
JButton exitButton = new JButton("Exit");
// JLabel statusbar = new JLabel("Text here");
receiveDBS.setFont(new java.awt.Font("Arial", 0, 25));
filePrep.setFont(new java.awt.Font("Arial", 0, 25));
fileShuffle.setFont(new java.awt.Font("Arial", 0, 25));
sendDBS.setFont(new java.awt.Font("Arial", 0, 25));
exitButton.setBorderPainted ( false );
exitButton.setMargin( new Insets ( 10, 10, 10, 10 ));
exitButton.setToolTipText( "EXIT Button" );
exitButton.setFont(new java.awt.Font("Arial", 0, 20));
exitButton.setEnabled(true); //Set to (false) to disable
exitButton.setForeground(new java.awt.Color(0, 0, 0));
exitButton.setHorizontalTextPosition(SwingConstants.CENTER); //Don't know what this does
exitButton.setBounds(10, 30, 90, 50); //Don't know what this does
exitButton.setBackground(new java.awt.Color(153, 101, 52));
topPanel.add(receiveDBS);
middle1.add(filePrep);
middle2.add(exitButton);
middle3.add(fileShuffle);
bottomPanel.add(sendDBS);
receiveDBS.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent ae)
if (ae.getSource() == receiveDBS);
try
Runtime.getRuntime().exec("cmd.exe /c start c:\\DBS\\ReceiveDBSfile.bat");
catch(Exception e)
System.out.println(e.toString());
e.printStackTrace();
filePrep.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent ae)
if (ae.getSource() == filePrep);
try
Runtime.getRuntime().exec("cmd.exe /c start c:\\DBS\\filePrep.bat");
catch(Exception e)
System.out.println(e.toString());
e.printStackTrace();
exitButton.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent ae)
System.exit(0);
fileShuffle.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent ae)
if (ae.getSource() == fileShuffle);
try
Runtime.getRuntime().exec("cmd.exe /c start c:\\DBS\\fileShuffle.bat");
catch(Exception e)
System.out.println(e.toString());
e.printStackTrace();
sendDBS.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent ae)
if (ae.getSource() == sendDBS);
try
Runtime.getRuntime().exec("cmd.exe /c start c:\\DBS\\sendDBSFile.bat");
catch(Exception e)
System.out.println(e.toString());
e.printStackTrace();
c.add(receiveDBS);
c.add(filePrep);
c.add(fileShuffle);
c.add(sendDBS);
c.add(exitButton);
// c.add(statusbar);
public static void main(String args[])
Buttons xyz = new Buttons();
xyz.setVisible(true);
}What I would like help with is the following
I would like output to either a JLabel or JTextArea to appear if a file appears on the network. Something along these lines
If file named nststrace*.* is in \\[network path] then output Download successful, please proceed.
btw I have done my best to search this forum for something similar and had no luck, but I am looking forward to Encephalopathics answer as he/she has consistently made me laugh with posted responses (in a good way).
Thanks in advance, Paul.Hospital_Apps_Monkey wrote:
we're starting to get aquainted, but I think "best friend" could take a while as it is still as hard going as I recall, but I will persevere.Heh, it's not so bad! For example, if I had no idea how to test whether a file exists, I would just scan the big list of classes on the left for names that sound like they might include File operations. Hey look, File! Then I'd look at all of File's methods for something that tests whether it exists or not. Hey, exists! Then if I still couldn't figure out how to use it, I'd do a google search on that particular method. -
Help please! Java application and web application...
Hi,
I have a problem with inserting a java application (Main.java) in a web application(index.jsp).
I found a source demo of a drag and drop application on the Internet, but now I want to
have the drag and drop application work in a Jpanel/JFrame in a webapplication.
The drag and drop application code:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
public class Main {
public static void main(final String[] args) {
final ButtonGroup grp = new ButtonGroup();
final JPanel palette = new JPanel(new FlowLayout(FlowLayout.LEFT));
palette.setBorder(BorderFactory.createTitledBorder("Palette"));
final MainPanel mainPanel = new MainPanel();
mainPanel.setPalette(palette);
for(int j=0; j<4; j++){
final JToggleButton btn = new JToggleButton("Panel "+(j+1));
palette.add(btn);
grp.add(btn);
btn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
mainPanel.setAdding(btn.getText());
final JFrame f = new JFrame("Drag and drop panels");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(palette, BorderLayout.WEST);
f.getContentPane().add(mainPanel, BorderLayout.CENTER);
f.setSize(800, 600);
f.setVisible(true);
class MainPanel extends JPanel implements MouseListener, MouseMotionListener {
private JPanel palette;
private String adding="";
private SubPanel hitPanel;
private int deltaX, deltaY, oldX, oldY;
private final int TOL = 4; //tolerance
public MainPanel() {
setLayout(null);
addMouseListener(this);
addMouseMotionListener(this);
public void mousePressed(final MouseEvent e) {
if( adding != "" ){
setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
SubPanel sub = new SubPanel(adding);
add(sub);
sub.setSize(sub.getPreferredSize());
sub.setLocation((int)e.getX(),(int)e.getY());
revalidate();
adding = "";
return;
Component c = getComponentAt(e.getPoint());
if (c instanceof SubPanel) {
hitPanel = (SubPanel) c;
oldX = hitPanel.getX();
oldY = hitPanel.getY();
deltaX = e.getX() - oldX;
deltaY = e.getY() - oldY;
if( oldX < e.getX()-TOL ) oldX += hitPanel.getWidth();
if( oldY < e.getY()-TOL ) oldY += hitPanel.getHeight();
public void mouseDragged(final MouseEvent e) {
if (hitPanel != null) {
int xH = hitPanel.getX();
int yH = hitPanel.getY();
int xDiff = e.getX()-oldX;
int yDiff = e.getY()-oldY;
int cursorType = hitPanel.getCursor().getType();
if( cursorType == Cursor.W_RESIZE_CURSOR){ //West resizing
hitPanel.setBounds( e.getX(), yH, hitPanel.getWidth() - xDiff, hitPanel.getHeight() );
}else if( cursorType == Cursor.N_RESIZE_CURSOR){ //North resizing
hitPanel.setBounds( xH, e.getY(), hitPanel.getWidth(), hitPanel.getHeight() - yDiff );
}else if( cursorType == Cursor.S_RESIZE_CURSOR){ //South resizing
hitPanel.setSize( hitPanel.getWidth(), hitPanel.getHeight() + yDiff );
}else if( cursorType == Cursor.E_RESIZE_CURSOR){ //East resizing
hitPanel.setSize( hitPanel.getWidth() + xDiff, hitPanel.getHeight() );
}else if( cursorType == Cursor.NW_RESIZE_CURSOR){ //NorthWest resizing
hitPanel.setBounds( e.getX(), e.getY(), hitPanel.getWidth() - xDiff, hitPanel.getHeight() - yDiff );
}else if( cursorType == Cursor.NE_RESIZE_CURSOR){ //NorthEast resizing
hitPanel.setBounds( xH, e.getY(), hitPanel.getWidth() + xDiff, hitPanel.getHeight() - yDiff );
}else if( cursorType == Cursor.SW_RESIZE_CURSOR){ //SouthWest resizing
hitPanel.setBounds( e.getX(), yH, hitPanel.getWidth() - xDiff, hitPanel.getHeight() + yDiff );
}else if( cursorType == Cursor.SE_RESIZE_CURSOR){ //SouthEast resizing
hitPanel.setBounds( xH, yH, hitPanel.getWidth() + xDiff, hitPanel.getHeight() + yDiff );
}else{ //moving subpanel
hitPanel.setLocation( e.getX()-deltaX, e.getY()-deltaY );
oldX = e.getX();
oldY = e.getY();
public void mouseMoved(final MouseEvent e) {
Component c = getComponentAt(e.getPoint());
if (c instanceof SubPanel) {
int x = e.getX();
int y = e.getY();
int xC = c.getX();
int yC = c.getY();
int w = c.getWidth();
int h = c.getHeight();
if( y >= yC-TOL && y <= yC+TOL && x >= xC-TOL && x <= xC+TOL ){
c.setCursor(new Cursor(Cursor.NW_RESIZE_CURSOR));
}else if( y >= yC-TOL && y <= yC+TOL && x >= xC-TOL+w && x <= xC+TOL+w ){
c.setCursor(new Cursor(Cursor.NE_RESIZE_CURSOR));
}else if( y >= yC-TOL+h && y <= yC+TOL+h && x >= xC-TOL && x <= xC+TOL ){
c.setCursor(new Cursor(Cursor.SW_RESIZE_CURSOR));
}else if( y >= yC-TOL+h && y <= yC+TOL+h && x >= xC-TOL+w && x <= xC+TOL+w ){
c.setCursor(new Cursor(Cursor.SE_RESIZE_CURSOR));
}else if( x >= xC-TOL && x <= xC+TOL ){
c.setCursor(new Cursor(Cursor.W_RESIZE_CURSOR));
}else if( y >= yC-TOL && y <= yC+TOL ){
c.setCursor(new Cursor(Cursor.N_RESIZE_CURSOR));
}else if( x >= xC-TOL+w && x <= xC+TOL+w ){
c.setCursor(new Cursor(Cursor.E_RESIZE_CURSOR));
}else if( y >= yC-TOL+h && y <= yC+TOL+h ){
c.setCursor(new Cursor(Cursor.S_RESIZE_CURSOR));
}else{
c.setCursor(new Cursor(Cursor.MOVE_CURSOR));
public void mouseReleased(final MouseEvent e) { hitPanel = null; }
public void mouseClicked(final MouseEvent e) {}
public void mouseEntered(final MouseEvent e) {}
public void mouseExited(final MouseEvent e) {}
public void setAdding(final String string) {
adding = string;
setCursor(new Cursor(Cursor.HAND_CURSOR));
public void setPalette(final JPanel panel) { palette = panel; }
class SubPanel extends JPanel {
public SubPanel(final String name) {
setPreferredSize(new Dimension(100, 100));
setBorder(new TitledBorder(new LineBorder(Color.BLACK), name));
}This application works with JFrame, but I want to display the JFrame in a webapplication (JSP Page).
I'm using Netbeans 6.0 (GlassFish) to create webapplication using Visual Web JavaServer Faces.
So in summary:
How can i display the drag and drop application into a JFrame (better in a JPanel) in a webapplication (index.jsp)??
Hope you can help...
Thanks in advance...
Greetings,
RajshSo have an applet that opens a JFrame... JSP or not has nothing to do with it, since it's nothing but HTML the client gets.
You can't have a JFrame embedded in an HTML page. And if you could have an applet but don't know how to get that copied code to fit inside (I mean, content pane is content pane), you might want to consider learning how to do that.
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