2 Basic Questions....

Ive done alot of reading to get some basic applet creating knowledge,
however I have 2 questions: What happens when a shape goes off and you
cant see it anymore? Is it possible to destroy is when it leaves the
screen or do I need to reuse it?

And how would I create an array of rectangles?

I want to just go forward/ or backwards for what seems forever, run my
applet and you'll see what i mean.

My Code so far:

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class KeyboardTest extends Applet implements KeyListener {

 int keyCode;
 int x = 100;
 int y = 100;
 int width = 75;
 int height = 100;

 public void init() {
  addKeyListener(this);
 }

 public void paint(Graphics g) {
  g.drawRect (x-50,y-50,width+100,height+100);
  g.drawRect (x,y,width,height);
  g.drawRect (x+50,y+50,width-100,height-100);
 }

 public void keyPressed(KeyEvent e) {
  keyCode = e.getKeyCode();
   if(keyCode == 38)
   {
    x--;
    y--;
    width = width +2;
    height = height +2;
   }
   else if(keyCode == 40)
   {
    x++;
    y++;
    width = width -2;
    height = height -2;
   }
  repaint();
 }

 public void keyReleased(KeyEvent e) { }
 public void keyTyped(KeyEvent e) { }

}