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POJava - KeyListener Events not firing
primarykey
Id
10165201
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10165327
AnswerCount
2
ClosedDate
CommentCount
3
CommunityOwnedDate
CreationDate
2012-04-15T19:18:19.423
FavoriteCount
1
LastActivityDate
2012-05-01T00:19:56.360
LastEditDate
2012-05-01T00:19:56.360
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13793
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1
Score
1
ViewCount
955
LastEditorDisplayName
text
Body
<p>I have begun to write a simple platform game in java. As a test, I wrote this simple program that moves a rectangle around the applet when you press the arrow keys. The key events have not been firing at all. Here's the code:</p> <pre><code>import java.applet.*; import java.awt.*; import java.awt.event.*; public class Game extends Applet implements Runnable, KeyListener { //setup data Thread t; Image buffimg; Graphics draw; Dimension dim; //game variables int charx = 400;//rectangles X and Y positions int chary = 50; boolean leftArrow = false; public void init() { setSize(800, 500); t = new Thread(this); t.start(); addKeyListener( this ); } public void run() { while(true) { repaint(); moveChar();//move the rectangle try { t.sleep(1000/30); } catch (InterruptedException e) { ; } } } public void keyPressed( KeyEvent e ) { int k = e.getKeyCode(); if(k == 37) { leftArrow = true; charx--; } } public void keyReleased( KeyEvent e ) { if(e.getKeyCode() == 37) { leftArrow = false; } } public void keyTyped( KeyEvent e ) { } public void moveChar() { //move rectangle on left arrow key press if(leftArrow == true) { charx--; } } public void paint(Graphics g) { g.drawRect(charx, chary, 100, 100); } public void update (Graphics g) { //double buffering // initialize buffer if (buffimg == null) { buffimg = createImage (this.getSize().width, this.getSize().height); draw = buffimg.getGraphics (); } // clear screen in background draw.setColor (getBackground ()); draw.fillRect (0, 0, this.getSize().width, this.getSize().height); // draw elements in background draw.setColor (getForeground()); paint (draw); // draw image on the screen g.drawImage (buffimg, 0, 0, this); } } </code></pre> <p>Why aren't they firing and how should I fix this?</p>
Tags
<java><event-handling><applet>
Title
Java - KeyListener Events not firing
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1. PO
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1. USJoe Doyle
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1. USJoe
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