java Swing - orbit

/*

Write a java program to plot the path of small circle moving around the circumference of a larger circle.

*/

         

// Java Graphics

// Orbit

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.awt.Graphics;

import java.awt.geom.*;

import java.lang.Math.*;

public class Orbit extends Frame

{

     double degree=0;

     int x1, y1;

    

     public void paint(Graphics g)

     {  

          g.fillOval(200,200,100,100);

     g.drawOval(50,50,400,400);

    

          degree=(degree+10)%360;

          x1 = (int)(200*java.lang.Math.cos((degree*2.0*3.142)/360.0))+250;

          y1 = (int)(200*java.lang.Math.sin((degree*2.0*3.142)/360.0))+250;

          g.drawOval(x1-15,y1-15,30,30);

             

          try

          {

              Thread.sleep(100);

          }

          catch(Exception e)

          {}

             

          repaint();

     }

     public static void main(String as[])

     {

          Orbit obj = new Orbit();

         

          obj.setSize(new Dimension(500,500));

          obj.setTitle("Orbit");

                       

          obj.setVisible(true);       

     }

}

Output: