import java.applet.*;
import java.awt.*;
import java.awt.event.*;
//<applet code="Circle" height="600" width="600"> </applet>

public class Circle extends Applet implements Runnable,KeyListener
{
int x=50,y=50;
String str="Hi";
int direction=6;


Thread t=new Thread(this);
public void init()
{
addKeyListener(this);

setBackground(Color.yellow);
setForeground(Color.red);
t.start();
}

public void run()
{
for(;;)
{
//System.out.println("run"+i);
repaint();

switchDir();


try
{
Thread.sleep(100);
}
catch(InterruptedException e)
{
e.printStackTrace();
}

}


}

void switchDir()
{
if(x<1)
{
direction=6;
return;
}
if(x+55>bounds().width)
{
direction=4;
return;
}
if(y<1)
{
direction=2;
return;
}
if(y+55>bounds().height)
{
direction=8;
return;
}

}

public void paint(Graphics g)
{
switch(direction)
{
case 6:
x+=10;
break;
case 8:
y-=10;
break;
case 2:
y+=10;
break;
case 4:
x-=10;
break;
}
//g.drawString(str,x,y);
//g.setForeground(Color.red);
g.fillOval(x,y,50,50);




}

public void keyPressed( KeyEvent e )
{
switch(e.getKeyCode())
{
case KeyEvent.VK_UP: direction=8; break;
case KeyEvent.VK_DOWN: direction=2; break;
case KeyEvent.VK_LEFT: direction=4; break;
case KeyEvent.VK_RIGHT: direction=6; break;
case KeyEvent.VK_E: t.stop(); break;
\
}

}
public void keyReleased( KeyEvent e )
{
}

public void keyTyped( KeyEvent e )
{
}
}