Bouncing ball program... having problems..

**ilovenayoon** · 12-08-2009, 01:43 PM

Java Code:

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public class PracticalExam extends JApplet
{
	int x = 70;
	int y = 100;
	int xVelocity = 5;
	int yVelocity = 5;

	public void start()
	{
		System.out.println("firing start...");

		Timer timer;
		final int FREQ = 33;
		timer = new Timer(FREQ, new ActionListener()
		{
			public void actionPerformed(ActionEvent evt)
			{
				repaint();
			}
		});

		timer.start();
	}


	public void paint(Graphics g)
	{

		if ( (x > 350) || (x < 50) )
		{
			xVelocity = -xVelocity;
		}

		if ( (x < 350) || (x > 50) )
		{
			g.setColor(Color.white);
			g.fillRect(x,y,30,30);
			x += xVelocity;
			y += yVelocity;
			g.setColor(Color.green);
			g.fillRect(x,y,30,30);
		}

		if ( (y > 250) || (y < 50) )
		{
			yVelocity = -yVelocity;
		}

		if ( (y < 250) || (y > 50) )
		{
			g.setColor(Color.white);
			g.fillOval(x,y,50,50);
			x += xVelocity;
			y += yVelocity;
			g.setColor(Color.red);
			g.fillRect(x,y,50,50);
		}

	}
}

I was making a progam that a ball bounces the wall.
My purpose was to make the ball change its shape and color when it bounces.
But I am having problems...
Please help me editting...... emergency T^T