problemas con frogger

[apocaliptica100]

Clase hilo

package mover;
import java.awt.*;

import javax.swing.*;
public class hilo extends thread
{
private jpanel panel;
private int x=0,y=200;
public hilo(jpanel elpanel)
{
panel=elpanel;

}
public void run()
{
while(true)
{
dibujar();
mueve();
incrementar();
//limpiar();

}
}
/*private void limpiar() {
// todo auto-generated method stub
graphics papel=panel.getgraphics();
imageicon fondo= new imageicon("piso.jpg");
fondo.painticon(panel,papel,0,0);

}*/
private void incrementar()
{
// todo auto-generated method stub
x=x+1;

}
private void mueve()
{
// todo auto-generated method stub
try {
thread.sleep(15);
}
catch (interruptedexception e)
{
// todo auto-generated catch block
e.printstacktrace();
}

}

public void dibujar( )
{
graphics papel =panel.getgraphics();
imageicon fondo= new imageicon("carro.gif");
fondo.painticon(panel,papel,x,y);


}

}