import java.awt.*;
import java.awt.event.*;
import java.awt.event.KeyEvent.*;
import javax.swing.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;
import java.util.*;
import java.io.*;
import java.awt.event.KeyListener.*;

public class Bouncer extends JFrame implements ActionListener
 {

    private JButton button;
    private JPanel panel;
   
    addKeyListener(new KeyAdapter()     {
            public void keyPressed(KeyEvent e)
            {
                aKeyWasPressed(e);
            }
        });
       
        Bouncer frame = new Bouncer();
        frame.setSize(500,500);
        frame.createGUI();
        frame.setVisible(true);
    }

    private void createGUI() {
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        Container window = getContentPane();
        window.setLayout(new FlowLayout() );

        panel = new JPanel();
        panel.setPreferredSize(new Dimension(400, 400));
        panel.setBackground(Color.white);
        window.add(panel);

        button = new JButton("");
        panel.add(button);
        button.addActionListener(this);
    }

    public void actionPerformed(ActionEvent event) {
        Graphics paper = panel.getGraphics();
        Ball ball = new Ball(paper);
        ball.animate();     
    }
}

class Ball {

    private Graphics paper;
    private int xball = 30, xChange = 6;
    private int yball = 30, yChange = 2;
    private int diameter = 10;
    private int width = 380, height = 380;
    private int ypaddletop = 180;
        private int ypaddlebottom = 220;

    public Ball(Graphics graphics) {
        paper = graphics;
    }

    public void animate() {
        for (int n = 1; n < 1000; n=n+3) {
            move();
            test();
            draw();
            paddle();
            delay();
            delete();

        } 
    }
   

    private void move() {
        xball = xball + xChange;
        yball = yball + yChange;
    }
   
    private void paddle() {
        paper.setColor(Color.blue);
        paper.fillRect(20, ypaddletop, 10, 40);
    }

    private void test() {
        if (xball <= 0 || xball  >= width)
            xChange = -xChange;
       
        if (yball <= 0 || yball >= height)
            yChange = -yChange;
       }

    private void delay() {
        try {
            Thread.sleep(50);
        }
        catch (InterruptedException e) {
            return;
        }
    }

    private void draw() {
        paper.setColor(Color.red);
        paper.fillOval(xball, yball, diameter, diameter);
    }

    private void delete() {
        paper.setColor(Color.white);
        paper.fillOval (xball, yball, diameter, diameter);
    }
    /*
    public void keyPressed(KeyEvent ke)
  {
    System.out.println("key PRESSED");
    int dx = 10;
 
    switch (ke.getKeyCode())
    {
      case KeyEvent.VK_UP:
        ypaddletop = ypaddletop - 20;
        break;
      case KeyEvent.VK_DOWN:
        ypaddletop = ypaddletop + 20;
    }
  }
     // Handle the key typed event from the text field.
    public void keyTyped(KeyEvent e) {
        displayInfo(e, "KEY TYPED: ");
    }

    // Handle the key-released event from the text field.
    public void keyReleased(KeyEvent e) {
        displayInfo(e, "KEY RELEASED: ");
    }
*/

    private void aKeyWasPressed(KeyEvent e)
    {
        String keyName = KeyEvent.getKeyText(e.getKeyCode());
       
        int keycode = e.getKeyCode();
       
        String direction = "holding position.";
        if (keycode == KeyEvent.VK_UP)
            direction = "going up!";
        else if (keycode == KeyEvent.VK_DOWN)
            direction = "falling down!";
       
        label.setText("Key pressed: " + keyName + "     "
            + "Status: " + direction);

}

}

public void updateWorld()
{
Graphics2D g = (Graphics2D) strategy.getBufferStrategy();

movePlayer();//where you would check to see if the player has moved
moveBall(); //where your code for moving the ball is

drawPaddle (g);
drawBall(g);
drawScore(g);
//above are all separate methods to do a draw command.
}