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import java.awt.*;

import java.util.*;

import java.applet.*;

/*

<APPLET CODE="Animation.JAVA" WIDTH=400 HEIGHT=300>

</APPLET>

*/

//The basic applet class.The applet shows 4 cars crossing each other at a square.

public class Animation extends Applet implements Runnable

{

Thread t;

//4 variables used to vary the car's positions.

int x1=0,x2=380,y1=50,y2=250;

public void start()

{

if(t==null)

{

t=new Thread(this,"New Thread");//New side Thread created on start of applet.

t.start();

}

}

public void stop()

{

if(t!=null)

{

t=null;//On stop of applet the created thread is destroyed.

}

}

//Implementation of method run() of Runnable interface.

public void run()

{

Thread t1=Thread.currentThread();

while(t==t1)

{

repaint();

try

{

Thread.sleep(100);

}

catch(Exception e)

{ }

}

}

public void paint(Graphics g)

{

setBackground(Color.cyan);

g.setColor(Color.BLACK);

x1=(x1+16)%400;

x2=x2-16;

y1=(y1+12)%300;

y2=y2-12;

if(y2<0)

y2=288;

if(x2<0)

x2=384;

//Draw the roads using 2 filled rectangles using black color.

g.fillRect(0,130,400,40);

g.fillRect(180,0,40,305);

//Draw the white colored lines.

g.setColor(Color.white);

for(int i=0;i<20;i++)

{

if(i!=9 && i!=10)

g.drawLine(i*20,150,i*20+10,150);

}

for(int j=0;j<15;j++)

{

if(j!=7 && j!=8)

g.drawLine(200,j*20,200,j*20+10);

}

//Draw 4 colored cars using filled round rectangles.

g.setColor(Color.red);

g.fillRoundRect(x2,152,20,8,2,2);

g.fillRoundRect(x1,140,20,8,2,2);

g.fillRoundRect(190,y1,8,20,2,2);

g.fillRoundRect(202,y2,8,20,2,2);

}

}

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