java - Simple Applet Game Bug -

i'm having trouble applet. it's purpose create game can move block @ bottom of screen fit through holes in blocks falling down above. i've implemented block can't block move when press key. here source code:

import java.awt.*; import java.awt.event.*; import javax.swing.*; public class mathewborumgame extends japplet {     public void init()     {         dimension dim = getsize();         mathewborumgamepanel avoidance = new mathewborumgamepanel(dim);         add(avoidance);         thread game = new thread(avoidance);         game.start();     } }// end of extended japplet class  class mathewborumgamepanel extends jpanel implements runnable{     protected int x = 225;     protected int y = 450;     private int speed = 0;     private boolean isplaying = false;     private boolean hashit = false;     private string instructions = "press 'enter' start survive long as"         + " possible.";     private string keyinstructions = "use arrow keys move.";     private string test;     private dimension dim = null;     private thread game = null;     private timer timer = new timer(1000, new timerlistener());     public mathewborumgamepanel(dimension paramdimension) {         this.dim = paramdimension;         setbackground(new color(255, 255, 204));         setforeground(color.black);         addkeylistener(new keyadapter() {             public void keypressed(keyevent e) {                         switch (e.getkeycode()) {                     case keyevent.vk_left:                         if(x >= 10) x = x - 10;                         repaint();                         break;                     case keyevent.vk_right:                         if(x <= 490) x = x + 10;                         repaint();                         break;                     default:                         repaint();                         break;                 }             }         });     }     public void run() {         (;;) {             repaint();         }     }     public void paintcomponent(graphics paramgraphics) {         super.paintcomponent(paramgraphics);         paramgraphics.fillrect(x, y, 50, 15);         paramgraphics.setfont(new font("serif", font.bold, 15));         paramgraphics.drawstring(this.instructions, 30, 30);         paramgraphics.drawstring(this.keyinstructions, 30, 50);         test = test.valueof(x);         paramgraphics.drawstring(test, 30, 70);     }      private class timerlistener implements actionlistener {         public void actionperformed(actionevent e) {             repaint();         }     } }//end of extended jpanel class 

thanks

see comments in code further tips..

import java.awt.*; import java.awt.event.*; import javax.swing.*;  // <applet code='mathewborumgame' width=400 height=400></applet> public class mathewborumgame extends japplet {     public void init()     {         dimension dim = getsize();         mathewborumgamepanel avoidance = new mathewborumgamepanel(dim);         add(avoidance);         /*         thread game = new thread(avoidance);         game.start();*/     } }// end of extended japplet class  class mathewborumgamepanel extends jpanel { //implements runnable{     protected int x = 225;     protected int y = 450;     private int speed = 0;     private boolean isplaying = false;     private boolean hashit = false;     private string instructions = "press 'enter' start survive long as"         + " possible.";     private string keyinstructions = "use arrow keys move.";     private string test;     private dimension dim = null;     private thread game = null;     private timer timer = new timer(1000, new timerlistener());     public mathewborumgamepanel(dimension paramdimension) {         this.dim = paramdimension;         setbackground(new color(255, 255, 204));         setforeground(color.black);         addkeylistener(new keyadapter() {             public void keypressed(keyevent e) {                         switch (e.getkeycode()) {                     case keyevent.vk_left:                         system.out.println("go left");                         if(x >= 10) x = x - 10;                         repaint();                         break;                     case keyevent.vk_right:                         system.out.println("go right");                         if(x <= 490) x = x + 10;                         repaint();                         break;                     default:                         //repaint();                         break;                 }             }         });         // must focusable!         setfocusable(true);         // important!  must have focus..         requestfocusinwindow();         timer.start();     }      /*  not how animation!     @override     public void run() {         (;;) {             repaint();         }     }*/      public void paintcomponent(graphics paramgraphics) {         super.paintcomponent(paramgraphics);         paramgraphics.fillrect(x, y, 50, 15);         paramgraphics.setfont(new font("serif", font.bold, 15));         paramgraphics.drawstring(this.instructions, 30, 30);         paramgraphics.drawstring(this.keyinstructions, 30, 50);         test = test.valueof(x);         paramgraphics.drawstring(test, 30, 70);     }      private class timerlistener implements actionlistener {         public void actionperformed(actionevent e) {             repaint();         }     } }//end of extended jpanel class