Q:

Bouncing Ball Program in Java Using Applet

YasminRadwan26
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2022-05-30
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Problem:- Bouncing ball animation in Applet or Bouncing ball in Java or How to create a bouncing ball animation or Bouncing Ball or bouncing ball program in java using an applet.how to make a bouncing ball in java or java bouncing balls collision detection or multiple bouncing balls java or bouncing ball in java using thread or bouncing ball program in java using an applet or moving ball program in java or java bouncing ball tutorial or java ball bounce off each other.

Explanation:- Bouncing ball animation in Java using Applet, is a simple GUI(Graphical User Interface) Animation. In this animation, there are 4 Balls with different-different color(Red, Blue, Magenta, Yellow) are Bouncing Random in a square. Now Question is That how actually they are moving in a square so basically Bouncing ball animation in Applet we are using a "For Loop" and running this "For Loop" Infinite and and changing there Ovels position and some values and repaint all four balls in a new position so in this way, all four ball looks like they are moving without changing their color. We also use some Event all event are below.

mouseExited
mouseReleased
mouseEntered
mousePressed
mouseClicked

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YasminRadwan26
2022-05-30
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import java.applet.*;
import java.awt.*;
import java.awt.event.*;
//

/* Program By Ghanendra Yadav
    Visit http://www.programmingwithbasics.com/
*/
public class BOUNCINGBALLS extends Applet implements MouseListener, Runnable
{
    Thread t=null;
    int x1=10, x2=10, x3=10, x4=10;
    int y1=300, y2=300, y3=300, y4=300;
 int flagx1,flagy1,flagx2,flagy2;
 int flagx3,flagy3,flagx4,flagy4;
    
    public void init()
     {
         addMouseListener(this);         
     }
    public void mouseExited(MouseEvent me)   {}
    public void mouseReleased(MouseEvent me) {}
    public void mouseEntered(MouseEvent me)  {}
    public void mousePressed(MouseEvent me)  {}
    public void mouseClicked(MouseEvent me)  {}
    
    public void start()
    {
        t=new Thread(this);                        
        t.start();
    }
   
    public void run()
    {
        for(;;)
        {
            try
            {
                repaint();
    if(y1<=50) 
    flagx1=0;
    else if(y1>=300) 
    flagx1=1;
    if(x1<=10) 
    flagy1=0;
    else if(x1>=400) 
    flagy1=1;
    if(y2<=50) 
    flagx2=0;
    else if(y2>=300) 
    flagx2=1;
    if(x2<=10) 
    flagy2=0;
    else if(x2>=400) 
    flagy2=1;
    if(y3<=50) 
    flagx3=0;
    else if(y3>=300) 
    flagx3=1;
    if(x3<=10) 
    flagy3=0;
    else if(x3>=400) 
    flagy3=1;
    if(y4<=50) 
    flagx4=0;
    else if(y4>=300) 
    flagx4=1;
    if(x4<=10) 
    flagy4=0;
    else if(x4>=400) 
    flagy4=1;
                Thread.sleep(10);
            }catch(InterruptedException e){}
        }
    }
    public void paint(Graphics g)
    {
  g.drawRect(10,50,410,270);
  
        g.setColor(Color.blue);
        g.fillOval(x1,y1,20,20);
  if(flagx1==1)
   y1-=2;
  else if(flagx1==0)
   y1+=2;
  if(flagy1==0)
   x1+=4;
  else if(flagy1==1)
   x1-=4; 
        g.setColor(Color.red);
        g.fillOval(x2,y2,20,20);
  if(flagx2==1)
   y2-=4;
  else if(flagx2==0)
   y2+=4;
  if(flagy2==0)
   x2+=3;
  else if(flagy2==1)
   x2-=3;
        g.setColor(Color.yellow);
        g.fillOval(x3,y3,20,20);
  if(flagx3==1)
   y3-=6;
  else if(flagx3==0)
   y3+=6;
  if(flagy3==0)
   x3+=2;
  else if(flagy3==1)
   x3-=2;
 g.setColor(Color.magenta);
        g.fillOval(x4,y4,20,20);
  if(flagx4==1)
   y4-=5;
  else if(flagx4==0)
   y4+=5;
  if(flagy4==0)
   x4+=1;
  else if(flagy4==1)
   x4-=1;
    }
}

Output:

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