Having lots of trouble debugging program

Question

Hello,
Im writing a very simple pong program, when I found that I needed to make an array of booleans, for remembering which keys are held down. Heres the program...
import java.awt.*;
import java.applet.Applet.*;
import java.awt.event.*;
import java.lang.*;
public class Pong extends java.applet.Applet implements KeyListener,Runnable{
     double ballX;
     double ballY;
     double paddleLeft;
     double paddleRight;
     boolean[] keys=new boolean[5];
     Thread t=new Thread(this);
     public void init(){
          ballX=100;
          ballY=100;
          paddleLeft=150;
          paddleRight=150;
          for(int i=0;i<4;i++){
               keys=new boolean();
          keys[1]=false;
          keys[2]=false;
          keys[3]=false;
          keys[4]=false;
          addKeyListener(this);
          t.start();
     public void paint(Graphics g){
          g.fillRect(5,(int)paddleLeft,5,70);
          g.fillRect(490,(int)paddleRight,5,70);
          g.fillOval((int)ballX,(int)ballY,10,10);
          if (keys[1]){g.drawString("hi",50,50);}
     public void keyTyped(KeyEvent e){}
     public void keyPressed(KeyEvent e){
          int keyPressed=e.getKeyCode();
          if (keyPressed==38){keys[1]=true;}          //arrow up
          if (keyPressed==40){keys[2]=true;}          //arrow down
          if (keyPressed==87){keys[3]=true;}          //w (up)
          if (keyPressed==83){keys[4]=true;}          //s (down)
     public void keyReleased(KeyEvent e){
          int keyPressed=e.getKeyCode();
          if (keyPressed==38){keys[1]=false;}          //arrow up
          if (keyPressed==40){keys[2]=false;}          //arrow down
          if (keyPressed==87){keys[3]=false;}          //w (up)
          if (keyPressed==83){keys[4]=false;}          //s (down)
     public void run(){
          while(true){
               repaint();
               try {
                    Thread.sleep(100);
               catch (InterruptedException e){}
and the output from the compiler..
/tmp/29795/Pong.java:22: '[' expected
               keys[i]=new boolean();
^
/tmp/29795/Pong.java:22: illegal start of expression
               keys[i]=new boolean();
^
/tmp/29795/Pong.java:22: incompatible types
found : boolean[]
required: boolean
               keys[i]=new boolean();
^
3 errors
I cant seem to figure out what to do.. please help!
Thanks in advance..

Answer 1

boolean is a primitive, not a class, so it doesn't have a constructor. When you create you boolean array, every element is initialized to a boolean with a value of false.
If it were an array of objects (that is, references), then every element would be initialized to a reference with a value of null, and you'd need to create objects to assign to each of those references.