import java.awt.*;import javax.swing.*;import java.awt.event.*;import java.util.EventListener;public class Ball extends JFrame implements  Runnable{    TankFrame tankFrame;    int x,y;    boolean up,down,left,right;    int Type;    boolean life;    public Image image;    int sleeptime;        Ball(int a,int b,TankFrame tankFrame){        this.tankFrame=tankFrame;        this.x=a;        this.y=b;        Type=0;        sleeptime=70;        image = Toolkit.getDefaultToolkit().getImage("images/56.jpg");    }    public void paint(Graphics g){        if(y==40||x==510){     }        else{ g.drawImage(image, x, y, 10,10,null); }    }    public void run(){        while(life){            if(x<0||x>500||y<50|| y>590){                life=false;            }            else{                if(up){ y-=10; }                else if(down){ y+=10; }                else if(left){ x-=10; }                else if(right){ x+=10; }            }            tankFrame.repaint();            try {                Thread.sleep(sleeptime);            } catch (InterruptedException ie) { }        }    }}