Moving Balls From Corners Using Java 2D

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 */

package packagename;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;
import javax.swing.JPanel;

/**

 *

 * @Aravind Sankaran Nair

 */

public class Game extends JPanel{

int x=0;

int y=0;

int xa=30;

int ya=30;

int xxa=60;

int yya=60;

int ballRadius=30;

    public Game() {

        this.setPreferredSize(new Dimension(320, 400));

    }

void grow(){

    x=x+1;

    y=y;

}

    /**

     * @param args the command line arguments

     */

   void moveTowardsBorder(){

       if(x>=0&&x<=(300-(ballRadius+20))){

           x=x+1;

           y=y;

          

       }

      

       if(x==251&&y>=0&&y<=(400-(ballRadius)-40)){

           x=x;

           y=y+1;

       }

       if(y==331&&x<=251&&x>=0){

           y=y;

           x=x-2;

       }

       if(x==-1&&y>=y){

           if(y!=0){

           x=x;

           y=y-1;}

           else{

               x=0;

               y=0;

           }

       }

       //

       if(xa==30&&ya>=0&&ya<=300){

           xa=xa;

           ya=ya+1;          

       }

       if(ya==301&&xa>=0&&xa<=230){

           ya=ya;

           xa=xa+1;

       }

       if(xa==231&&ya<=301){

           if(ya!=30){

           ya=ya-1;

           xa=xa;}

       }

       if(ya==30&xa<=231){

           xa=xa-1;

           ya=ya;

       }

     

       if(xxa>=60&&xxa<=(250-(ballRadius+20))){

           xxa=xxa+1;

           yya=yya;          

       }

       if(xxa==201&&yya>=0&&yya<=260){

           xxa=xxa;

           yya=yya+1;

       }

       if(yya==261&&xxa<=201&&xxa>=60){

           yya=yya;

           xxa=xxa-2;

       }

       if(xxa==59&&yya>=yya){

           if(yya!=60){

               xxa=xxa;

               yya=yya-1;

           }else{

               xxa=60;

               yya=60;

           }

       }

       System.out.println("xxa=="+x);

       System.out.println("yya=="+y);

   }

    @Override

    public void paint(Graphics g) {

        super.paint(g);

        Graphics2D g2d=(Graphics2D)g;

        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,   RenderingHints.VALUE_ANTIALIAS_ON);

       

        g2d.setColor(Color.black);

        g2d.fillRect(0, 0, 300, 400);

        if(y==0){

        g2d.setColor(Color.red);

        g2d.fillOval(x, y, ballRadius/2, ballRadius/2);       

        }

        else if(x==251){

         g2d.setColor(Color.green);

         g2d.fillOval(x, y, ballRadius/2, ballRadius/2);       

        }

        else if(y==331){

         g2d.setColor(Color.red);

         g2d.fillOval(x, y, ballRadius/2, ballRadius/2);         

        }

        else if(x==-1){

         g2d.setColor(Color.green);

         g2d.fillOval(x, y, ballRadius/2, ballRadius/2);      

        }

        if(xa==30){

        g2d.setColor(Color.white);

        g2d.fillOval(xa, ya, ballRadius/2, ballRadius/2);

        }

        else if(ya==301){

        g2d.setColor(Color.ORANGE);

        g2d.fillOval(xa, ya, ballRadius/2, ballRadius/2);

        }

        else if(xa==231){

        g2d.setColor(Color.white);

        g2d.fillOval(xa, ya, ballRadius/2, ballRadius/2);

        }

        else if(ya==30){

        g2d.setColor(Color.ORANGE);

        g2d.fillOval(xa, ya, ballRadius/2, ballRadius/2);

        }

        if(xxa==60){

        g2d.setColor(Color.blue);

        g2d.fillOval(xxa, yya, ballRadius/2, ballRadius/2);

        }

        else if(xxa==201){

        g2d.setColor(Color.PINK);

        g2d.fillOval(xxa, yya, ballRadius/2, ballRadius/2);

        }

        else if(yya==261){

        g2d.setColor(Color.blue);

        g2d.fillOval(xxa, yya, ballRadius/2, ballRadius/2);

        }

        else if(xxa==59){

        g2d.setColor(Color.pink);

        g2d.fillOval(xxa, yya, ballRadius/2, ballRadius/2);

        }

    else

        {

          g2d.setColor(Color.blue);

          g2d.fillOval(xxa, yya, ballRadius/2, ballRadius/2); 

        }

    }

  

    public static void main(String[] args) {

        Game g=new Game();

        // TODO code application logic here

        JFrame frame=new JFrame();

        frame.setSize(300, 400);

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.add(g);

        frame.setVisible(true);       

        while(true){

            g.moveTowardsBorder();

            g.repaint();

            try {

                Thread.sleep(5);

            } catch (InterruptedException ex) {

                Logger.getLogger(Game.class.getName()).log(Level.SEVERE, null, ex);

            }

        }

    }

}

Output: