Can i copy values from one object to another ?
One more help..
How do i compare the input values with the ones in an object of another class ?
Can i copy values of one object of a class to different object of another class ?
Thanks,
Sanlearns
How do i compare the input values with the ones in an
object of another class ?By getting and comparing them?
Can i copy values of one object of a class to
different object of another class ?Yes, you can. But you shouldn't, as you're breaking encapsulation all over the place. You could use setter methods (if available) to set the values.
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I am new to swing prgramming .
I have created a menu called " TopFrame " and it contains toplevel menu item "select" and select Menu contains subitems "firstframe", "secondframe", "thirdframe" and "Exit".
When i click select->firstframe it displays a new Frame f1 with a
textfield t1. I enter value in textfield t1 and minimise the frame.
similarly when i click select->secondframe it displays a new Frame f2 with a textfield t1. I enter value in textfield t1 and minimise the frame.
now when i click select->thirdframe it displays a frame f3 which contains button called "Totalvalue" and a textfield t2 .
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Actually my application is big but for better understanding i have reduced the description above.
I am posting the code...Kindly help me
thanks in advance..
import java.awt.*;
import java.awt.event.*;
import java.awt.Component;
import java.awt.Checkbox;
import javax.swing.*;
import java.text.DecimalFormat;
import javax.swing.JComponent;
public class MainWindow extends Frame {
public MainWindow() {
super("TopFrame");
setSize(600, 600);
// make a top level File menu
FileMenu fileMenu = new FileMenu(this);
// make a menu bar for this frame
// and add top level menus File and Menu
MenuBar mb = new MenuBar();
mb.add(fileMenu);
setMenuBar(mb);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
exit();
public void exit() {
setVisible(false); // hide the Frame
dispose(); // tell windowing system to free resources
System.exit(0); // exit
public static void main(String args[]) {
MainWindow w = new MainWindow();
w.setVisible(true);
w.setBackground(Color.white);
private static MainWindow w ;
protected TextField t1, t2;
class FileMenu extends Menu implements ActionListener {
private MainWindow mw; // who owns us?
private MenuItem itm1 = new MenuItem("Firstframe");
private MenuItem itm2 = new MenuItem("Secondframe");
private MenuItem itm3 = new MenuItem("Thirdframe");
private MenuItem itmExit = new MenuItem("Exit");
public FileMenu(MainWindow main)
super("Select");
this.mw = main;
this.itm1.addActionListener(this);
this.itm2.addActionListener(this);
this.itm3.addActionListener(this);
this.itmExit.addActionListener(this);
this.add(this.itm1);
this.add(this.itm2);
this.add(this.itm3);
this.add(this.itmExit);
public void actionPerformed(ActionEvent e)
if (e.getSource() == this.itm1)
final Frame f1 = new Frame("first frame opened");
f1.setSize(500,500);
f1.setLayout(null);
Label l1 = new Label("Enter first value below");
l1.setBounds(220, 250, 240, 24);
f1.add(l1);
TextField t1 = new TextField("0");
t1.setBounds(260, 300, 40, 24);
f1.add(t1);
f1.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e)
//System.exit(0);
f1.dispose();
f1.show();
else
if (e.getSource() == this.itm2)
final Frame f2 = new Frame("second frame opened");
f2.setSize(500,500);
f2.setLayout(null);
Label l1 = new Label("Enter first value below");
l1.setBounds(220, 250, 240, 24);
f2.add(l1);
TextField t1 = new TextField("0");
t1.setBounds(260, 300, 40, 24);
f2.add(t1);
f2.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e)
//System.exit(0);
f2.dispose();
f2.show();
else
if (e.getSource() == this.itm3)
final Frame f3 = new Frame("third frame opened");
f3.setSize(500,500);
f3.setLayout(null);
JButton b1 = new JButton("Totalvalue");
b1.setBounds(220, 300, 180, 24);
f3.add(b1);
TextField t2 = new TextField("0");
t2.setBounds(410, 300, 40, 24);
f3.add(t2);
f3.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e)
//System.exit(0);
f3.dispose();
f3.show();
else
{ mw.exit();}hi ,
I have extended my application ...i have some doubts can you please clear my doubts..
Now i have two textfields t1 and t2 in both the frames frame 1 and frame 2 and i have 2 buttons Button1 and Button2, textfields t5 and t6 in frame3.
Now my question is i enter some values in t1 and t2 in frame1, and t1 and t2 in frame2 and minimise or close them...when i open frame3 and press Button1 it should take values from t1 in both frame1 and frame2 , add them and display the result in t5( in frame3)... similarly when i press Button2 it should take values from t2 in both frame1 and frame2, add them and display the result in t6(in frame3).
Can you please tell me how can i do this?
Thanks in advance.
I am posting the code...
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.Component;
// Make a main window with a top-level menu: File
public class MainWindow extends Frame {
public MainWindow() {
super("Test Window");
setSize(500, 500);
// make a top level File menu
FileMenu fileMenu = new FileMenu(this);
// make a menu bar for this frame
// and add top level menus File and Menu
MenuBar mb = new MenuBar();
mb.add(fileMenu);
setMenuBar(mb);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
exit();
public void exit() {
setVisible(false); // hide the Frame
dispose(); // tell windowing system to free resources
System.exit(0); // exit
public static void main(String args[]) {
w = new MainWindow();
w.setVisible(true);
private static MainWindow w ;
protected TextField t1, t2,t5,t6;
// Encapsulate the look and behavior of the File menu
class FileMenu extends Menu implements ActionListener {
private MainWindow mw; // who owns us?
private MenuItem itmPE = new MenuItem("ProductEvaluation");
private MenuItem itmPRE = new MenuItem("ProcessEvaluation");
private MenuItem itmTE = new MenuItem("TotalEvaluation");
private MenuItem itmExit = new MenuItem("Exit");
public FileMenu(MainWindow main) {
super("File");
this.mw = main;
this.itmPE.addActionListener(this);
this.itmPRE.addActionListener(this);
this.itmTE.addActionListener(this);
this.itmExit.addActionListener(this);
this.add(this.itmPE);
this.add(this.itmPRE);
this.add(this.itmTE);
this.add(this.itmExit);
// respond to the Exit menu choice
public void actionPerformed(ActionEvent e) {
if (e.getSource() == this.itmPE) {
final Frame frame1 = new Frame("Frame1");
frame1.setSize(700,700);
frame1.setLayout(null);
t1 = new TextField("");
t1.setBounds(230, 230, 50, 24);
frame1.add(t1);
t2 = new TextField("");
t2.setBounds(330, 230, 50, 24);
frame1.add(t2);
frame1.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
frame1.dispose();
frame1.setVisible(true);
else
if (e.getSource() == this.itmPRE) {
final Frame frame2 = new Frame("Frame2");
frame2.setSize(700,700);
frame2.setLayout(null);
t1 = new TextField("");
t1.setBounds(230, 230, 50, 24);
frame2.add(t1);
t2 = new TextField("");
t2.setBounds(330, 230, 50, 24);
frame2.add(t2);
frame2.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
frame2.dispose();
frame2.setVisible(true);
else
if (e.getSource() == this.itmTE) {
final Frame frame3 = new Frame("Frame4");
frame3.setSize(700,700);
frame3.setLayout(null);
t5 = new TextField("");
t5.setBounds(170, 230, 50, 24);
frame3.add(t5);
t6 = new TextField("");
t6.setBounds(270, 230, 50, 24);
frame3.add(t6);
ActionListener action = new MyActionListener(frame3,t5,t6);
Button b1 = new Button("Button1");
b1.setBounds(170, 400, 120, 24);
b1.addActionListener(action);
frame3.add(b1);
Button b2 = new Button("Button2");
b2.setBounds(300, 400, 120, 24);
b2.addActionListener(action);
frame3.add(b2);
frame3.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
frame3.dispose();
frame3.setVisible(true);
else {
mw.exit();
class MyActionListener implements ActionListener {
private Frame frame3;
private TextField t5;
private TextField t6;
public MyActionListener(Frame frame3,TextField tf5,TextField tf6)
this.frame3 = frame3;
this.t5 = tf5;
this.t6 = tf6;
public void actionPerformed(ActionEvent e) {
String s = e.getActionCommand();
if (s.equals("Button1")) {
// I think code for the Button1 action can be written here
else if (s.equals("Button2")) {
// I think code for the Button2 action can be written here
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