Using grapics in JPanel
I am having a problem drawing on a panel that I already have other images and buttons on. I am trying to draw lines connecting the buttons which have images on them. The problem is that when I draw something from within the paint method it erases my panel, but if I repaint the panel it goes over what I have drawn. Can somebody please help me in how to do this. Thanks
hmm.. i don't really understand your problem..what do you want to do exactly? can you give me some code of your paint method??
when you want to draw Images on a panel which has some other components on it, use paintComponent insteed of paint! notice that the paint methods are called sequentially.
g.drawImage(img,0,0,null);
g.setColor(Color.black);
g.fillRect(0,0,800,600);
this code will display a black rect, but no image... the image was painted but overpainted by the rect...
i hope this helps you a bit.. (sorry about the bad english.. )
visit >> http://www.menzsoft.ch <<
rgds
chris
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import java.awt.Graphics2D;
import javax.swing.*;
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JFrame f = new JFrame();
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FadingOut glassOut = new FadingOut();
FadingIn glassIn = new FadingIn();
JPanel contentPane = new JPanel();
//contentPane.setLayout(new java.awt.GridLayout(10,10));
contentPane.setLayout(new java.awt.FlowLayout());
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// for(int column = 0; column < 10; column++) {
contentPane.add(new JButton("Fading"));
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contentPane.add(new JButton("2347676767"));
f.setContentPane(contentPane);
f.pack();
f.setSize(400,400);
f.setVisible(true);
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f.setGlassPane(glassOut);
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//glassOut.beginFade();
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// usando glassOut e apos glassIn -> glassIn faz aparecer
// usando somente glassIn -> glassIn faz desaparecer rapido
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Unable to paint (using paint() in JPanel) inside mouse listeners
This is hard to explain but I'll do my best :)
I've created a little game and at some point I needed to make images "move" on the JPanel (through paint()), on a checkers-based game board.
The game works like so:
it has a mouse listener for clicks and movement, and the main game process is THINK(), REPAINT(), which is repeated until the user wins (the above is inside a while).
The mouse actions were added to the constructor so they are always active, THINK changes the enemy's locations, and REPAINT simply calls "paint()" again.
The picture is either an enemy or the player, and it can only "rest" on squares.
(e.g. point's x and y must be divided in 50).
While doing that, I wanted to make the movement more sleek and clean,
instead of them simply jumping from one square to the other with a blink of the eye.
So, I've created MOVEACTOR, that "moves" an enemy or a player from its current point (actor.getPoint()) to the requested future square (futurePoint).
//actor = enemy or player, has getPoint() that returnes the current point on the board where he rests on.
//futurePoint = the new point where the enemy or player should be after the animation.
//please ignore obvious stuff that has nothing to do with what I asked -- those will be deleted in the future, for they are only temporary checking extra lines and stuff.
//also feel free to ignore the "jumpX" things. Those are just to change images, to imitate physical "jumping" animation.
protected void moveActor(Actor actor, Point futurePoint)
Point presentPoint = actor.getPoint();
int x = (int)presentPoint.getX(), y = (int)presentPoint.getY();
int addToX, addToY;
if (futurePoint.getX() > x) addToX = 1;
else addToX = -1;
if (futurePoint.getY() > y) addToY = 1;
else addToY = -1;
Point middlePoint = new Point(x,y);
int imageCounter = 0;
while ( (middlePoint.getX()!=futurePoint.getX()) && (middlePoint.getY()!=futurePoint.getY()) ){
imageCounter++;
x+=addToX;
y+=addToY;
middlePoint.setLocation(x,y);
actor.setPoint(middlePoint);
/*if (imageCounter<=10) actor.setStatus("jump1");
else if (imageCounter<=40) actor.setStatus("jump2");
else if (imageCounter<=50) actor.setStatus("jump3");*/
repaint();
try {animator.sleep(1);} catch (InterruptedException e) {}
//actor.setStatus("idle");
}I use the above on several occasions:
[1] When an enemy moves. Summary:
if (playerIsToVillainsRight) xToAdd = 50;
else if (playerIsToVillainsLeft) xToAdd = -50;
else if (playerIsOnSameRowAsVillain) xToAdd = 0;
if (playerIsBelowVillain) yToAdd = 50;
else if (playerIsAboveVillain) yToAdd = -50;
else if (playerIsOnSameColumnAsVillain) yToAdd = 0;
Point futurePoint = new Point (villainX+xToAdd, villainY+yToAdd);
moveActor(actors[currentVillain], futurePoint);[2] When the player moves. Summary (this is inside the mouseClicked listener):
//mouseLocation = MouseWEvent.getPoint();
//stl, str, etc = rectangles that represents future location of the player on the board.
if (waitingForPlayer) {
if (stl.contains(mouseLocation) && !hoveringVillain(stl)) {
moveActor(actors[0], stl.getLocation());
waitingForPlayer = false;
if (str.contains(mouseLocation) && !hoveringVillain(str)) {
moveActor(actors[0], str.getLocation());
waitingForPlayer = false;
if (sbl.contains(mouseLocation) && !hoveringVillain(sbl)) {
moveActor(actors[0], sbl.getLocation());
waitingForPlayer = false;
if (sbr.contains(mouseLocation) && !hoveringVillain(sbr)) {
moveActor(actors[0], sbr.getLocation());
waitingForPlayer = false;
SO ... WHAT IS THE QUESTION?!?
What I see when I run the game:
the animation of the enemy (first code) works, but the animation of the player (second code, inside the mouse listeners) -- doesn't!
The purpose of the moveActor is to move the enemy or player pixel by pixel, until its in the future point,
instead of skipping the pixels between the squares and going straight for the future location.
So what comes out is, that the enemy is moving pixel by pixel, and the player simply jumps there!
I doublechecked and if I use moveActor with the player OUTSIDE the mouse listener, it works (i think).
Any ideas what is the source of this problem?
Hope I made myself clear enough :D
Thanks,
Eshed.I don't know if thats what happens, nor how to fix the thread problems. The mosue actions are "threaded" by default, no? And the moving thing happens after the mouse was clicked, and if the enemy's moving the user can still move his mouse and get responses, like "enemy didn't move yet" and stuff.
Here's the complete GamePanel.java:
//drawings
import javax.swing.ImageIcon;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
//events
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
//tools
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.MediaTracker;
import java.awt.Dimension;
//panels, buttons, etc
import javax.swing.JPanel;
/** The Game Panel.
*The panel's size is 500x500, and each square is squaresized 50.
*This is where the game actually "exists". Here its being updated, drawn, etc.*/
public class GamePanel extends JPanel implements Runnable
private static final int PWIDTH = 500; //Width of the panel.
private static final int PHEIGHT = 500; //Height of the panel.
private static final int SQUARESIZE = 50; //Size of each square in the panel.
private boolean working = false; //Game keeps going until this is FALSE.
private volatile Thread animator; //The animation thread.
private ImageIcon stand,fall; //Images for the background - ground and water.
private static ImageHandler ih; //An image handler for image loading.
private int numOfImages = 0; //Number of total images (max image qunatity).
private Actor[] actors; //The actors: [0] is the player, rest are enemies.
private Point mouseLocation; //Saves the current mouse location for checking where the mouse is
protected Rectangle stl, str, sbl, sbr; //squares around the player, for mouse stuff.
protected Rectangle v1, v2, v3, v4, v5; //squares around each villain, for mouse stuff.
protected Rectangle wholeBoard = new Rectangle(0,0,PWIDTH,PHEIGHT);
protected boolean waitingForPlayer = true;
private int currentVillain = 1;
private boolean inSight = false;
// in methods other than the listeners.
/** Waits for the Window (or whatever this panel loads in) to settle in before doing anything.*/
public void addNotify()
super.addNotify(); //When the super finishes...
go(); //..go, go, go!
/** Starts the game.*/
private void go()
if (animator==null || !working) { //if the game isn't in process,
animator = new Thread(this); //make the animator as the main process,
animator.start(); //and start it (because of the runnable it launches "run()".
/**Constructor of the Game Panel.*/
public GamePanel()
numOfImages = 14; //Total image num.
ih = new ImageHandler(this,numOfImages); //Setting a new image handler for the images.
ih.addImage("player_idle", "images/p_idle.png"); //Adding images.
ih.addImage("villain_idle", "images/v_idle.png");
ih.addImage("stand", "images/stand.gif");
ih.addImage("fallpng", "images/fall.png");
ih.addImage("fall", "images/fall.gif");
ih.addImage("ghost", "images/ghost.gif");
ih.addImage("villain_angry", "images/v_angry.png");
ih.addImage("player_angry", "images/p_angry.png");
ih.addImage("player_jump1", "images/p_j1.gif");
ih.addImage("player_jump2", "images/p_j2.gif");
ih.addImage("player_jump3", "images/p_j3.gif");
ih.addImage("villain_jump1", "images/v_j1.gif");
ih.addImage("villain_jump2", "images/v_j2.gif");
ih.addImage("villain_jump3", "images/v_j3.gif");
setPreferredSize(new Dimension(PWIDTH,PHEIGHT)); //Setting size of the panel.
setFocusable(true); //This and the next makes the window "active" and focused.
requestFocus();
/** Mouse hovering settings.*/
addMouseMotionListener( new MouseMotionAdapter()
/** When the mouse is moving, do these stuff.*/
public void mouseMoved(MouseEvent e1)
* | stl | | str | stl = squareTopLeft
* |_______|_______|_______| str = squareTopRight
* | |current| | current = player's location
* |_______|_______|_______| sbl = squareBottomLeft
* | sbl | | sbr | sbr = squareBottomRight
* |_______|_______|_______|
mouseLocation = e1.getPoint();
Dimension defaultSquareDimension = new Dimension(50,50);
//current-player-location points
Point topLeft = new Point((int)actors[0].getPoint().getX(), (int)actors[0].getPoint().getY());
Point topRight = new Point((int)actors[0].getPoint().getX()+50, (int)actors[0].getPoint().getY());
Point bottomLeft = new Point((int)actors[0].getPoint().getX(), (int)actors[0].getPoint().getY()+50);
Point bottomRight = new Point((int)actors[0].getPoint().getX()+50, (int)actors[0].getPoint().getY()+50);
//four-squares-around-the-player points
//T = top, B = bottom, R = right, L = left
Point ptl = new Point((int)topLeft.getX()-50,(int)topLeft.getY()-50);
Point ptr = new Point((int)topRight.getX(),(int)topRight.getY()-50);
Point pbl = new Point((int)bottomLeft.getX()-50,(int)bottomLeft.getY());
Point pbr = new Point((int)bottomRight.getX(),(int)bottomRight.getY());
//ghosts
stl = new Rectangle (ptl, defaultSquareDimension);
str = new Rectangle (ptr, defaultSquareDimension);
sbl = new Rectangle (pbl, defaultSquareDimension);
sbr = new Rectangle (pbr, defaultSquareDimension);
Rectangle player = new Rectangle(topLeft, defaultSquareDimension); //rectangle of player
if (stl.contains(mouseLocation) && !hoveringVillain(stl))
actors[8] = new Actor("ghost", ptl);
else actors[8] = null;
if (str.contains(mouseLocation) && !hoveringVillain(str))
actors[9] = new Actor("ghost", ptr);
else actors[9] = null;
if (sbl.contains(mouseLocation) && !hoveringVillain(sbl))
actors[10] = new Actor("ghost", pbl);
else actors[10] = null;
if (sbr.contains(mouseLocation) && !hoveringVillain(sbr))
actors[11] = new Actor("ghost", pbr);
else actors[11] = null;
private boolean hoveringVillain(Rectangle r)
boolean onVillain = false;
for (int i=1; i<=5 && !onVillain; i++) onVillain = actors.getRect().equals(r);
return onVillain;
/** Mouse-click settings.
Note: only usable after moving the mouse. /
addMouseListener (new MouseAdapter()
/** When the mouse button is clicked */
public void mouseClicked (MouseEvent me)
mouseClickedAction(me);
private boolean hoveringVillain(Rectangle r)
boolean onVillain = false;
for (int i=1; i<=5 && !onVillain; i++) onVillain = actors[i].getRect().equals(r);
return onVillain;
public void mouseClickedAction(MouseEvent me)
System.out.println("Point: "+me.getX()+","+me.getY());
if (waitingForPlayer) {
//causes error if the mouse wasn't moved uptil now. try it.
mouseLocation = me.getPoint();
if (stl.contains(mouseLocation) && !hoveringVillain(stl)) {
moveActor(actors[0], stl.getLocation());
waitingForPlayer = false;
if (str.contains(mouseLocation) && !hoveringVillain(str)) {
moveActor(actors[0], str.getLocation());
waitingForPlayer = false;
if (sbl.contains(mouseLocation) && !hoveringVillain(sbl)) {
moveActor(actors[0], sbl.getLocation());
waitingForPlayer = false;
if (sbr.contains(mouseLocation) && !hoveringVillain(sbr)) {
moveActor(actors[0], sbr.getLocation());
waitingForPlayer = false;
} else MiscTools.shout("Wait for the computer to take action!");
if (actors[0].getPoint().getY() == 0){
for (int i=1; i<=5; i++){
actors[i].setStatus("angry");
//repaint();
MiscTools.shout("Game Over! You Won!");
/** First thing the Game Panel does.
Initiating the variables, and then looping: updating, painting and sleeping./
public void run() {
Thread thisThread = Thread.currentThread(); //Enables the restart action (two threads needed).
init(); //Initialize the variables.
while (animator == thisThread && working){ //While the current thead is the game's and it's "on",
think(); //Update the variables,
repaint(); //Paint the stuff on the panel,
try {Thread.sleep(5);} catch (InterruptedException ex) {} //And take a wee nap.
/** Initializing the variables.*/
private void init()
currentVillain = 1;
working = true; //Make the game ready for running.
inSight = false;
actors = new Actor[12]; //Six actors: player and 5*villains.
actors[0] = new Actor("player", 200, 450); //The first actor is the player.
int yPoint = 50; //The Y location of the villains (first row).
/* ACTORS ON TOP, RIGHT, LEFT
actors[1] = new Actor ("villain", 0, 350);
actors[2] = new Actor ("villain", 0, 150);
actors[3] = new Actor ("villain", 50, 0);
actors[4] = new Actor ("villain", 250, 0);
actors[5] = new Actor ("villain", 450, 0);
actors[6] = new Actor ("villain", 450, 200);
actors[7] = new Actor ("villain", 450, 400);
/* ACTORS ON TOP*/
for (int i=1; i<actors.length-4; i++){ //As long as it doesnt go above the array...
actors[i] = new Actor ("villain", yPoint, 0); //init the villains
actors[i].setStatus("idle");
yPoint+=100; //and advance in the Y axis.
/** Updating variables.*/
private void think()
if (!waitingForPlayer){
//initialize
int playerX = (int)actors[0].getPoint().getX();
int playerY = (int)actors[0].getPoint().getY();
boolean moved = false;
wholeBoard = new Rectangle(0,0,500,500); //needed to check whether an actor is inside the board
//for (int in = 0; in<=5; in++) actors[in].setStatus("idle"); //"formatting" the actor's mood
if (playerY <= 1000) inSight = true; //first eye contact between the player and villains.
int closestVillainLevel = 0;
int[] vills = closestVillain();
int moveCounter = 0;
if (inSight) {
while (!moved){ //while none of the villains made a move
moveCounter++;
if (moveCounter == 5) moved = true;
else{
currentVillain = vills[closestVillainLevel];
int villainX = (int)actors[currentVillain].getPoint().getX();
int villainY = (int)actors[currentVillain].getPoint().getY();
//clearing stuff up before calculating things
boolean playerIsBelowVillain = playerY > villainY;
boolean playerIsAboveVillain = playerY < villainY;
boolean playerIsOnSameRowAsVillain = playerY == villainY;
boolean playerIsToVillainsRight = playerX > villainX;
boolean playerIsToVillainsLeft = playerX < villainX;
boolean playerIsOnSameColumnAsVillain = playerX == villainX;
//System.out.println("\n-- villain number "+currentVillain+" --\n");
int xToAdd = 0, yToAdd = 0;
if (playerIsToVillainsRight) xToAdd = 50;
else if (playerIsToVillainsLeft) xToAdd = -50;
else if (playerIsOnSameRowAsVillain) xToAdd = 0;
if (playerIsBelowVillain) yToAdd = 50;
else if (playerIsAboveVillain) yToAdd = -50;
else if (playerIsOnSameColumnAsVillain) yToAdd = 0;
Point futurePoint = new Point (villainX+xToAdd, villainY+yToAdd);
if (legalPoint(futurePoint)){
moveActor(actors[currentVillain], futurePoint);
moved = true;
//System.out.println("\nVillain "+currentVillain+" is now at "+actors[currentVillain].getPoint());
else closestVillainLevel=circleFive(closestVillainLevel);
} //end of else
} //end of while
//currentVillain = circleFive(currentVillain); //obsolete
} //end of ifInSight
waitingForPlayer = true;
private boolean legalPoint(Point fp)
return (wholeBoard.contains(fp) && !onPeople(fp) && legalSquare(fp));
private boolean legalSquare(Point p)
if ( (p.getX()==0 || p.getX()%100==0) && (p.getY()/50)%2!=0 ) return true;
if ( (p.getX()/50)%2!=0 && (p.getY()==0 || p.getY()%100==0) ) return true;
return false;
//return the closest villain to the player, by its level of distance.
public int[] closestVillain()
//System.out.println("Trying to find the closest villain...");
double[] gaps = new double[5]; //the distances array
//System.out.println("The villains' distances are: ");
for (int i=0; i<5; i++){
gaps[i] = distanceFromPlayer(actors[i+1].getPoint()); //filling the distances array
//System.out.print(gaps[i]+", ");
int[] toReturn = new int[5];
double smallestGapFound;
double[] arrangedGaps = smallToLarge(gaps);
for (int level=0; level<5; level++){
smallestGapFound = arrangedGaps[level];
for (int i=1; i<=5; i++){
if (smallestGapFound == distanceFromPlayer(actors[i].getPoint())){
toReturn[level] = i;
return toReturn;
private double[] smallToLarge(double[] nums)
//System.out.println("\nArranging array... \n");
double[] newArray = new double[5];
int neweye = 0;
double theSmallestOfTheArray;
for (int i=0; i<nums.length; i++){
theSmallestOfTheArray = smallest(nums);
//System.out.println("\t\t>> Checking whether location "+i+" ("+nums[i]+") is equal to "+theSmallestOfTheArray);
if (nums[i] == theSmallestOfTheArray && nums[i]!=0.0){
//System.out.println("\t\t>> Adding "+nums[i]+" to the array...");
newArray[neweye] = nums[i];
//System.out.println("\t\t>> Erasing "+nums[i]+" from old array...\n");
nums[i] = 0.0;
neweye++;
i=-1;
/*System.out.print("\nDONE: ");
for (int i=0; i<newArray.length; i++)
System.out.print("["+newArray[i]+"] ");
System.out.println();*/
return newArray;
private double smallest (double[] nums)
//System.out.print("\tThe smallest double: ");
double small = 0.0;
int j=0;
while (j<nums.length){ //checking for a starting "small" that is not a "0.0"
if (nums[j]!=0.0){
small = nums[j];
j = nums.length;
} else j++;
for (int i=1; i<nums.length; i++){
if (small>nums[i] && nums[i]!=0.0){
small = nums[i];
//System.out.println(small+".");
return small;
private double distanceFromPlayer(Point vp)
Point pp = actors[0].getPoint(); //pp=plaer's point, vp=villain's point
double x = Math.abs(vp.getX() - pp.getX());
double y = Math.abs(vp.getY() - pp.getY());
return Math.sqrt(Math.pow(x,2) + Math.pow(y,2));
private int circleFive(int num)
if (num>=5) return 0;
else return num+1;
private boolean onPeople(Point p)
for (int jj=0; jj<=5; jj++)
if (jj!=currentVillain && p.equals(actors[jj].getPoint()))
return true;
return false;
/** Painting the game onto the Game Panel.*/
public void paintComponent(Graphics g)
Graphics2D graphics = (Graphics2D)g; //Reset the graphics to have more features.
//draw bg
graphics.setColor(Color.white); //"format" the panel.
graphics.fillRect(0,0,500,500);
char squareType = 'f'; //First square's type (stand or fall).
for (int height=0; height<PHEIGHT; height=height+SQUARESIZE){ //Painting the matrix bg.
for (int width=0; width<PWIDTH; width=width+SQUARESIZE){
if (squareType=='f') { //If a "fall" is to be drawn,
ih.paint(graphics, "fallpng", new Dimension(width,height)); //Draw a non-animated image to bypass white stuff.
ih.paint(graphics, "fall", new Dimension(width,height)); //Draw the water animation.
squareType = 's'; //Make the next square a "stand".
} else if (squareType=='s'){ //If a "stand" is to be drawn,
ih.paint(graphics, "stand", new Dimension(width,height)); //Draw the ground image,
squareType = 'f'; //and make the next square a "fall".
if (squareType=='f') squareType = 's'; //After finishing a row, switch again so
else squareType = 'f'; // the next line will start with the same type (checkers).
for (int i=actors.length-1; i>=0; i--){ //Draw the actors on the board.
if (actors[i]!=null)
ih.paint(graphics, actors[i].currentImage(), actors[i].getPoint());
/** Restart the game.
Or, in other words, stop, initialize and start (again) the animator thread and variables./
public void restart()
System.out.println("\n\n\nRESTARTING GAME\n\n\n");
animator = null; //Emptying the thread.
init(); //Initializing.
animator = new Thread(this); //Re-filling the thread with this panel's process.
animator.start(); //launch "run()".
protected void moveActor(Actor actor, Point futurePoint)
Point presentPoint = actor.getPoint();
int x = (int)presentPoint.getX(), y = (int)presentPoint.getY();
int addToX, addToY;
if (futurePoint.getX() > x) addToX = 1;
else addToX = -1;
if (futurePoint.getY() > y) addToY = 1;
else addToY = -1;
Point middlePoint = new Point(x,y);
int imageCounter = 0;
while ( (middlePoint.getX()!=futurePoint.getX()) && (middlePoint.getY()!=futurePoint.getY()) ){
imageCounter++;
x+=addToX;
y+=addToY;
middlePoint.setLocation(x,y);
actor.setPoint(middlePoint);
/*if (imageCounter<=10) actor.setStatus("jump1");
else if (imageCounter<=40) actor.setStatus("jump2");
else if (imageCounter<=50) actor.setStatus("jump3");*/
repaint();
try {animator.sleep(1);} catch (InterruptedException e) {}
//actor.setStatus("idle"); -
Want to use JDeskTopPane in JPanel
Hi
I want to use JDeskTopPane in a JPanel. The reason is that I want to use some JInternalFrames within a particular panel of my application.
I am using an applet so obviously I could use this.setContentPane() when loading the APPLET, however I need some kind of setContentPane() method on my JPanel which I am using.
Not sure if you can do that to a JPanel.
cheers,
OliverThis section from the Swing tutorial shows you how to use a JDeskTopPane and JInternalFrame:
http://java.sun.com/docs/books/tutorial/uiswing/components/internalframe.html -
(Another) problem with custom painting using JApplet and JPanel
Hi all,
I posted regarding this sort of issue yesterday (http://forums.sun.com/message.jspa?messageID=10883107). I fixed the issue I was having, but have run into another issue. I've tried solving this myself to no avail.
Basically I'm working on creating the GUI for my JApplet and it has a few different JPanels which I will be painting to, hence I'm using custom painting. My problem is that the custom painting works fine on the mainGUI() class, but not on the rightGUI() class. My code is below:
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.*;
import javax.imageio.*;
public class TetrisClone extends JApplet {
public void init() {
setSize( 450, 500 );
Container content = getContentPane();
content.add( new mainGUI(), BorderLayout.CENTER );
content.add( new rightGUI() , BorderLayout.LINE_END );
class mainGUI extends JPanel {
// Main bit where blocks fall
public mainGUI() {
setBackground( new Color(68,75,142) );
setPreferredSize( new Dimension( 325, 500 ) );
validate();
public Dimension getPreferredSize() {
return new Dimension( 450, 500 );
public void paintComponent( Graphics g ) {
super.paintComponent(g);
// As a test. This shows up fine.
g.setColor( Color.black );
g.fillRect(10,10,100,100);
g.setColor( Color.white );
g.drawString("Main",45,55);
class rightGUI extends JPanel {
BufferedImage img = null;
int currentLevel = 0;
int currentScore = 0;
int currentLines = 0;
public rightGUI() {
// The right panel. Has quite a few bits. Starts here..
FlowLayout flow = new FlowLayout();
flow.setVgap( 20 );
setLayout( flow );
setPreferredSize( new Dimension( 125, 500 ) );
setBackground( new Color(27,34,97) );
setBorder( BorderFactory.createMatteBorder(0,2,0,0,Color.black) );
// Next block bit
JPanel rightNext = new JPanel();
rightNext.setPreferredSize( new Dimension( 100, 100 ) );
//rightNext.setBackground( new Color(130,136,189) );
rightNext.setOpaque( false );
rightNext.setBorder( BorderFactory.createEtchedBorder(EtchedBorder.LOWERED) );
Font rightFont = new Font( "Courier", Font.BOLD, 18 );
// The player's playing details
JLabel rightLevel = new JLabel("Level: " + currentLevel, JLabel.LEFT );
rightLevel.setFont( rightFont );
rightLevel.setForeground( Color.white );
JLabel rightScore = new JLabel("Score: " + currentScore, JLabel.LEFT );
rightScore.setFont( rightFont );
rightScore.setForeground( Color.white );
JLabel rightLines = new JLabel("Lines: " + currentLines, JLabel.LEFT );
rightLines.setFont( rightFont );
rightLines.setForeground( Color.white );
JPanel margin = new JPanel();
margin.setPreferredSize( new Dimension( 100, 50 ) );
margin.setBackground( new Color(27,34,97) );
JButton rightPause = new JButton("Pause");
try {
img = ImageIO.read(new File("MadeBy.gif"));
catch (IOException e) { }
add( rightNext );
add( rightLevel );
add( rightScore );
add( rightLines );
add( margin );
add( rightPause );
validate();
public Dimension getPreferredSize() {
return new Dimension( 125, 500 );
public void paintComponent( Graphics g ) {
super.paintComponent(g);
g.setColor( Color.black );
g.drawString( "blah", 425, 475 ); // Doesn't show up
g.drawImage( img, 400, 400, null ); // Nor this!
System.out.println( "This bit gets called fine" );
}Any help would be greatly appreciated. I've read loads of swing and custom painting tutorials and code samples but am still running into problems.
Thanks,
Tristan PerryMany thanks for reminding me about the error catching - I've added a System.out.println() call now. Anywhoo, the catch block never gets run; the image get call works fine.
My problem was/is:
"My problem is that the custom painting works fine on the mainGUI() class, but not on the rightGUI() class. My code is below:"
I guess I should have expanded on that. Basically whatever I try to output in the public void paintComponent( Graphics g ) method of the rightGUI class doesn't get output.
So this doesn't output anything:
g.drawString( "blah", 425, 475 ); // Doesn't show up
g.drawImage( img, 400, 400, null ); // Nor this!
I've checked and experimented with setOpaque(false), however this doesn't seem to be caused by any over-lapping JPanels or anything.
Let me know if I can expand on this :)
Many thanks,
Tristan Perry
Edited by: TristanPerry on Dec 10, 2009 8:40 AM -
How can i use an inner Jpanel in another JPanel
Hi, i need to put an inner panel in a container panel.I have been trying for hours but I couldn't make it work. Please waiting for help...
public class Gui extends JFrame{
public Gui() {
setDefaultCloseOperation(EXIT_ON_CLOSE);
setEnabled(true);
setSize(500, 500);
JPanel mainPanel=new JPanel();
int v=ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS;
int h=ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS;
JScrollPane jsp=new JScrollPane(mainPanel,v,h);
this.add(mainPanel);
setContentPane(jsp);
//this part doesn't works
JPanel innerPanel=new JPanel();
innerPanel.setSize(50, 50);
innerPanel.setLocation(100, 100);
innerPanel.setBorder(BorderFactory.createLineBorder(Color.black));
innerPanel.setBackground(Color.red);
//this part doesn't works
public static void main(String[] args) {
Gui gui= new Gui();
gui.setVisible(true);
}I'm sorry it's my bad that i have forgotten to add the innerPanel to mainPannel (But of course i tried it in the original code :) ). Now i made the changes you suggested but there are still problems.
I can see the innerPanel now, but the size and the position of the innerPanel doesn't works.
public Gui() {
setDefaultCloseOperation(EXIT_ON_CLOSE);
setEnabled(true);
setSize(500, 500);
JPanel mainPanel=new JPanel();
int v=ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS;
int h=ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS;
JScrollPane jsp=new JScrollPane(mainPanel,v,h);
getContentPane().add(jsp);
JPanel innerPanel=new JPanel();
innerPanel.setSize(500, 500);
innerPanel.setLocation(400, 400);
innerPanel.setBorder(BorderFactory.createLineBorder(Color.black));
innerPanel.setBackground(Color.red);
mainPanel.add(innerPanel);
//also i tried
//getContentPane().add(innerPanel);
//or
//jsp.add(innerPanel);
... -
JScrollPane, JPanel used to make a paint-like application
I am new to swing. I need help with implementing a paint-like application using JScrollPane and JPanel.
I have put a JPanel inside a JScrollPane.
The size of JPanel exceeds preferred size of JScrollPane, and i can see the scrollbars, and can go up and down.
Problem is, when i draw on the JPanel, i can see what i've drawn very clearly. Now if I scroll down, and then scroll back up, whatever i had previously drawn has been erased.
let me put it in a simpler manner. suppose i have drawn a filled circle whose diameter is equal to the viewport size of the JScrollPane. Now i am scrolling down till i can see only the bottom half of the circle. When i scroll back up, the upper half of the circle has been erased.
i think this is a newbie error, and i guess it'll have a textbook response, so i have not bothered to paste my entire code here. however, if it is required, please let me know.Sounds very much like you're painting outside the paint cycle. Read this,
http://java.sun.com/products/jfc/tsc/articles/painting/
When the user draws on the screen, you want to do one of two things (these being just the most obvious and easiest implementations). For raster operations you want to manipulate an Image; for vector operations you want to manipulate a collection of Shapes.
Your paintComponent() method of the panel should simply draw the stored images and shapes to the supplied Graphics object as appropriate.
If you paint to a Graphics object outside the paint cycle then it will all be erased when the paint cycle is next invoked. -
Which Listener I should use if I drag and Drop an image/icon into a JPanel?
Dar Friends:
Happy new year.
I try to drag and Drop an image/icon into a JPanel, and hope I can immediately detect it after DND,
Which Listener I should use in this JPanel if I drag and Drop an image/icon into a JPanel??
ThanksThank camickr .
I can dnd an image into a JPanel called JPanelOld already, I hope to use another JPanel or JTree to listen to any Dropped Image in JPanelOld later on so I can take some action in another JPanel or JTree.
so what kind of Listener I should use for my purpose??
where to add this Listeners??
Happy New Year. -
How to force to wait and get input from a jframe-jpanel?
I would like to use a jframe-jpanel to get user input instead of using JOptionPane.showInputDialog since there will be more than 1 input.
But I could not do it. The code reads the panel lines and passes to other lines below without waiting for the okay button to be pressed.
This is the part of code of my main frame;
jLabel10.setText(dene.toString());
if (dene == 0) {
// todo add button input panel
//String todo_write = JOptionPane.showInputDialog("Please enter a todo item");
JFrame frameTodoAddInput = new JFrame( "Please input..." );
TodoAddAsk1JPanel todoaddpanel = new TodoAddAsk1JPanel();
frameTodoAddInput.add(todoaddpanel);
frameTodoAddInput.setSize( 600, 200 ); // set frame size
frameTodoAddInput.setLocation(300, 300);
//String todo_write = todoaddpanel.getNewTodoItem();
String todo_write = todoaddpanel.getNewTodoItem();
jLabel10.setText("Satir 1822 de".concat(todo_write));
// end of todo add button input panel
todoTextPane1.setText(todo_write);
This is the code of input panel;
* TodoAddAsk1JPanel.java
* Created on May 6, 2007, 12:03 AM
package javaa;
public class TodoAddAsk1JPanel extends javax.swing.JPanel {
/** Creates new form TodoAddAsk1JPanel */
public TodoAddAsk1JPanel() {
initComponents();
private String NewTodoItem = "";
public String getNewTodoItem() {
NewTodoItem = ANewTodoItemTextField.getText();
return this.NewTodoItem;
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
// <editor-fold defaultstate="collapsed" desc=" Generated Code ">
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
ANewTodoItemTextField = new javax.swing.JTextField();
jLabel2 = new javax.swing.JLabel();
PriorityComboBox = new javax.swing.JComboBox();
jLabel3 = new javax.swing.JLabel();
DayValueComboBox = new javax.swing.JComboBox();
MonthValueComboBox = new javax.swing.JComboBox();
YearValueComboBox = new javax.swing.JComboBox();
OkayButton = new javax.swing.JButton();
CancelButton = new javax.swing.JButton();
TimeValueComboBox = new javax.swing.JComboBox();
jLabel1.setText("Please enter a todo item:");
jLabel2.setText("Please select its priority level:");
PriorityComboBox.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "A", "B", "C" }));
jLabel3.setText("Please select its due date:");
DayValueComboBox.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30", "31" }));
MonthValueComboBox.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" }));
YearValueComboBox.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "2007", "2008", "2009", "2010", "2011", "2012", "2013", "2014", "2015", "2016", "2017", "2018", "2019", "2020", "2021", "2022", "2023", "2024", "2025", "2026", "2027", "2028", "2029", "2030", "2031", "2032", "2033", "2034", "2035", "2036", "2037", "2038", "2039", "2040", "2041", "2042", "2043", "2044", "2045", "2046", "2047", "2048", "2049", "2050", "2051", "2052", "2053", "2054", "2055", "2056", "2057", "2058", "2059", "2060", "2061", "2062", "2063", "2064", "2065", "2066", "2067", "2068", "2069", "2070" }));
OkayButton.setText("OK");
OkayButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
OkayButtonActionPerformed(evt);
CancelButton.setText("Cancel");
TimeValueComboBox.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "08:30", "09:00", "09:30", "10:00", "10:30", "11:00", "11:30", "12:00", "12:30", "13:00", "13:30", "14:00", "14:30", "15:00", "15:30", "16:00", "16:30", "17:00", "17:30", "18:00", "18:30", "19:00", "19:30", "20:00", "20:30", "21:00", "21:30", "22:00", "22:30", "23:00", "23:30", "00:00", "00:30", "01:00", "01:30", "02:00", "02:30", "03:00", "03:30", "04:00", "04:30", "05:00", "05:30", "06:00", "06:30", "07:00", "07:30", "08:00" }));
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
this.setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel1, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 142, Short.MAX_VALUE)
.addComponent(jLabel2, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jLabel3, javax.swing.GroupLayout.DEFAULT_SIZE, 142, Short.MAX_VALUE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(PriorityComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(ANewTodoItemTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 279, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(OkayButton, javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 133, Short.MAX_VALUE)
.addComponent(CancelButton))
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
.addComponent(DayValueComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(MonthValueComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(YearValueComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGap(13, 13, 13)
.addComponent(TimeValueComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(42, 42, 42)))
.addContainerGap())
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(ANewTodoItemTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel1))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(PriorityComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel3)
.addComponent(DayValueComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(MonthValueComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(YearValueComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(TimeValueComboBox, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(OkayButton)
.addComponent(CancelButton))
.addContainerGap())
}// </editor-fold>
private void OkayButtonActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
NewTodoItem = ANewTodoItemTextField.getText();
// Variables declaration - do not modify
private javax.swing.JTextField ANewTodoItemTextField;
private javax.swing.JButton CancelButton;
private javax.swing.JComboBox DayValueComboBox;
private javax.swing.JComboBox MonthValueComboBox;
private javax.swing.JButton OkayButton;
private javax.swing.JComboBox PriorityComboBox;
private javax.swing.JComboBox TimeValueComboBox;
private javax.swing.JComboBox YearValueComboBox;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
// End of variables declaration
I want to get the resulted input of "NewTodoItem"
Thanks in advance for your kind help.
GuvenThank you very much for your help. But I would like
to get 3 inputs from 1 window at the same time and I
could not find any example code for JDialog for more
than 1 input. If any body can show how to write this
code, it would be appreciated.
ThanksYou can write your own. A JDialog is a container just look a JFrame is. -
'...' not appearing in obscured table cell when using custom renderer.
Hello all -
I am using a custom JPanel as a cell renderer in a JTable to display two icons per cell. Unfortunately, I am running into a problem that occurs when resizing a column such that the width of the column is less than the size of the cell content. Normally, when resizing a cell in this manner, it will start to cut off the text within the cell and add '...' to signify that some material is obscured. However, using my cell renderer, the text simply cuts off with no indication whatsoever there is more content that is being hidden. I have tried looking through the JComponent code to find a function to overload but I haven't had much luck. Does anyone have any suggestions?
For a simple example, compile and run the following code and try resizing the two columns. You should be able to notice the difference.
Thanks,
- Alex
import java.awt.*;
import java.awt.image.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
public class TwoIcons extends JFrame {
public static void main(String[] args){
createIcons();
SwingUtilities.invokeLater
new Runnable()
public void run() {
new TwoIcons();
public TwoIcons(){
super("Test");
DefaultTableModel tm = new DefaultTableModel(
new Object[][]{
{new IconPair("cross", "cross"), "just a string"},
{new IconPair("circle", "cross"),"just another string"},
{new IconPair("String", "circle"),"yet another string"}
}, new String[]{"Two Icons","String"}){
public Class getColumnClass(int columnIndex){
if(columnIndex==0){
return IconPair.class;
else
return super.getColumnClass(columnIndex);
JTable table = new JTable(tm);
final Color bg = table.getBackground();
table.setDefaultRenderer(IconPair.class, new TableCellRenderer(){
RendererPanel renderer = new RendererPanel(bg);
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
renderer.setIcons((IconPair)value);
return renderer;
JScrollPane scp = new JScrollPane(table);
add(scp);
setSize(400,100);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setVisible(true);
class RendererPanel extends JPanel{
JLabel icon1, icon2;
RendererPanel(Color bg){
setLayout(new BoxLayout(this,BoxLayout.LINE_AXIS) );
icon1=new JLabel();
icon2=new JLabel();
add(icon1);
add(icon2);
setBackground(bg);
public void setIcons(IconPair value) {
icon1.setIcon(value.i1);
icon1.setToolTipText("Icon 1");
icon2.setIcon(value.i2);
icon2.setToolTipText("Icon 2");
//uncomment next 2 lines if you want text as well
icon1.setText(value.s1);
icon2.setText(value.s2);
class IconPair {
public Icon i1,i2;
public String s1,s2;
IconPair(String s1, String s2){
this.i1=(Icon)icons.get(s1);
this.i2=(Icon)icons.get(s2);
this.s1=s1;
this.s2=s2;
static Map icons = new HashMap();
public static void createIcons(){
Image img = new BufferedImage(10,10, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2=(Graphics2D)(img.getGraphics());
g2.setColor(Color.BLUE);
g2.drawLine(0,0,10,10);
g2.drawLine(0,10,10,0);
icons.put("cross",new ImageIcon(img));
img = new BufferedImage(10,10, BufferedImage.TYPE_INT_ARGB);
g2=(Graphics2D)(img.getGraphics());
g2.setColor(Color.ORANGE);
g2.drawOval(1,1,8,8);
icons.put("circle",new ImageIcon(img));
}Things aren't resizable in your layout for the custom renderer. Here's your code working as you want (I think)
import java.awt.*;
import java.awt.image.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
public class TwoIcons extends JFrame {
public static void main(String[] args){
createIcons();
SwingUtilities.invokeLater
new Runnable()
public void run() {
new TwoIcons();
public TwoIcons(){
super("Test");
DefaultTableModel tm = new DefaultTableModel(
new Object[][]{
{new IconPair("cross", "cross"), "just a string"},
{new IconPair("circle", "cross"),"just another string"},
{new IconPair("String", "circle"),"yet another string"}
}, new String[]{"Two Icons","String"}){
public Class getColumnClass(int columnIndex){
if(columnIndex==0){
return IconPair.class;
else
return super.getColumnClass(columnIndex);
JTable table = new JTable(tm);
final Color bg = table.getBackground();
table.setDefaultRenderer(IconPair.class, new TableCellRenderer(){
RendererPanel renderer = new RendererPanel(bg);
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
renderer.setIcons((IconPair)value);
return renderer;
JScrollPane scp = new JScrollPane(table);
getContentPane().add(scp);
setSize(400,100);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setVisible(true);
class RendererPanel extends JPanel{
JLabel icon1, icon2;
RendererPanel(Color bg){
setLayout(new BoxLayout(this,BoxLayout.LINE_AXIS) );
icon1=new JLabel();
icon2=new JLabel();
add(icon1);
add(icon2);
icon1.setMinimumSize(new Dimension(0, 0));
icon2.setMinimumSize(new Dimension(0, 0));
icon1.setMaximumSize(new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE));
icon2.setMaximumSize(new Dimension(Integer.MAX_VALUE, Integer.MAX_VALUE));
setBackground(bg);
public void setIcons(IconPair value) {
icon1.setIcon(value.i1);
icon1.setToolTipText("Icon 1");
icon2.setIcon(value.i2);
icon2.setToolTipText("Icon 2");
//uncomment next 2 lines if you want text as well
icon1.setText(value.s1);
icon2.setText(value.s2);
class IconPair {
public Icon i1,i2;
public String s1,s2;
IconPair(String s1, String s2){
this.i1=(Icon)icons.get(s1);
this.i2=(Icon)icons.get(s2);
this.s1=s1;
this.s2=s2;
static Map icons = new HashMap();
public static void createIcons(){
Image img = new BufferedImage(10,10, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2=(Graphics2D)(img.getGraphics());
g2.setColor(Color.BLUE);
g2.drawLine(0,0,10,10);
g2.drawLine(0,10,10,0);
icons.put("cross",new ImageIcon(img));
img = new BufferedImage(10,10, BufferedImage.TYPE_INT_ARGB);
g2=(Graphics2D)(img.getGraphics());
g2.setColor(Color.ORANGE);
g2.drawOval(1,1,8,8);
icons.put("circle",new ImageIcon(img));
}Note that the ... is a function of the JLabel when it is too small to render its text. -
Why do we use super when there is no superclass?
Hello,
I have a question about the word "super " and the constructor. I have read about super and the constructor but there is somethong that I do not understand.
In the example that I am studying there is a constructor calles " public MultiListener()" and there you can see " super" to use a constructor from a superclass. But there is no superclass. Why does super mean here?
import javax.swing.*;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.Insets;
import java.awt.Dimension;
import java.awt.Color;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class MultiListener extends JPanel
implements ActionListener {
JTextArea topTextArea;
JTextArea bottomTextArea;
JButton button1, button2;
final static String newline = "\n";
public MultiListener() {
super(new GridBagLayout());
GridBagLayout gridbag = (GridBagLayout)getLayout();
GridBagConstraints c = new GridBagConstraints();
JLabel l = null;
c.fill = GridBagConstraints.BOTH;
c.gridwidth = GridBagConstraints.REMAINDER;
l = new JLabel("What MultiListener hears:");
gridbag.setConstraints(l, c);
add(l);
c.weighty = 1.0;
topTextArea = new JTextArea();
topTextArea.setEditable(false);
JScrollPane topScrollPane = new JScrollPane(topTextArea);
Dimension preferredSize = new Dimension(200, 75);
topScrollPane.setPreferredSize(preferredSize);
gridbag.setConstraints(topScrollPane, c);
add(topScrollPane);
c.weightx = 0.0;
c.weighty = 0.0;
l = new JLabel("What Eavesdropper hears:");
gridbag.setConstraints(l, c);
add(l);
c.weighty = 1.0;
bottomTextArea = new JTextArea();
bottomTextArea.setEditable(false);
JScrollPane bottomScrollPane = new JScrollPane(bottomTextArea);
bottomScrollPane.setPreferredSize(preferredSize);
gridbag.setConstraints(bottomScrollPane, c);
add(bottomScrollPane);
c.weightx = 1.0;
c.weighty = 0.0;
c.gridwidth = 1;
c.insets = new Insets(10, 10, 0, 10);
button1 = new JButton("Blah blah blah");
gridbag.setConstraints(button1, c);
add(button1);
c.gridwidth = GridBagConstraints.REMAINDER;
button2 = new JButton("You don't say!");
gridbag.setConstraints(button2, c);
add(button2);
button1.addActionListener(this);
button2.addActionListener(this);
button2.addActionListener(new Eavesdropper(bottomTextArea));
setPreferredSize(new Dimension(450, 450));
setBorder(BorderFactory.createCompoundBorder(
BorderFactory.createMatteBorder(
1,1,2,2,Color.black),
BorderFactory.createEmptyBorder(5,5,5,5)));
public void actionPerformed(ActionEvent e) {
topTextArea.append(e.getActionCommand() + newline);
topTextArea.setCaretPosition(topTextArea.getDocument().getLength());
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("MultiListener");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
JComponent newContentPane = new MultiListener();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}OP wrote:
>
Isn't that simplier to use the constructor instead of using "super"? I mean using the constructor jpanel () ?
>
You can't call the super class constructor directly if you are trying to construct the sub-class. When you call it directly it will construct an instance of the super class but that instance will NOT be an integral part of the 'MultiListener' sub class you are trying to create.
So since 'MultiListener' extends JPanel if you call the JPanel constructor directly (not using super) your code constructing a new instance of JPanel but that instance will not be an ancestor of your class that extends JPanel. In fact that constructor call will not execute until AFTER the default call to 'super' that will be made without you even knowing it.
A 'super' call is ALWAYS made to the super class even if your code doesn't have an explicit call. If your code did not include the line:
super(new GridBagLayout()); Java would automatically call the public default super class constructor just as if you had written:
super();If the sub class cannot access a constructor in the super class (e.g. the super class constructor is 'private') your code won't compile.
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