hvad er der galt med n´mit applet

jeg skal hvade en kasse til at flytte sig og jeg har prøvet med denne kode hvad er der galt

import java.awt.*;
import java.applet.*;
public class Kurvetegningsapplet extends Applet
{
int n;

int bil11 = 10;
int bil12 = 10;
public void paint(Graphics g)
{
g.fillRect(10,10,100,40);
for(int i=0; i<10;i=i+0)
{
bil11=bil11+10;
bil12=bil12+10;
}
}


public void update(Graphics g)
{
paint(g);
}

}


hilsen jonas

Kode 

import java.awt.*;
import java.applet.*;
public class Kurvetegningsapplet extends Applet
{
	int n;
	
	int bil11 = 10;
	int bil12 = 10;
    public void paint(Graphics g)
    {
    g.fillRect(10,10,100,40);
    for(int i=0; i<10;i++)
    {
    	bil11=bil11+10;
    	bil12=bil12+10;
    }
    }
    
    
    public void update(Graphics g)
    {
    	paint(g);
    }

}

Kode 

import java.awt.*; 
import java.applet.*; 
public class Test extends Applet 
{ 
  int n; 
  int x = 0; 
  int y = 0; 
  int moveX = 1;
  int moveY = 0;
  int w = 50;
  int h = 50;
  Thread thread;
  public void start()
  {
    thread = new Thread(new Runnable() {
      public void run() {
        while(true) {
          x += moveX;
          y += moveY;
          if(moveX == 1 && x == (getSize().width - w)) {
            moveX = 0;
            moveY = 1;
          }
          else if(moveX == -1 && x == 0) {
            moveX = 0;
            moveY = -1;
          }
          else if(moveY == 1 && y == (getSize().height - h)) {
            moveY = 0;
            moveX = -1;
          }
          else if(moveY == -1 && y == 0) {
            moveY = 0;
            moveX = 1;
          }
          repaint();
          try {
            Thread.sleep(10);
          } catch (Exception e) {
          }
        }
      }
    });
    thread.start();
  }

  public void paint(Graphics g) 
  {
    //Nulstil baggrund 
    g.setColor(Color.white);
    g.fillRect(0,0,getSize().width,getSize().height);

    g.setColor(Color.black);
    g.fillRect(x,y,w,h); 
  } 
  public void update(Graphics g) 
  { 
    paint(g);
  } 
}