关于线程控制小球跳跃反弹的例子程序

Question

急需一个线程控制小球跳跃反弹的例子程序！给源代码的直接结帖！

Answer 1

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.util.*;
import javax.swing.*;public class Bounce {
    public Bounce() {
    }    public static void main(String[] args) {
        JFrame frame = new BounceFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}class Ball
{
    public void move(Rectangle2D bounds)
    {
        x+=dx;
        y+=dy;
        if(x < bounds.getMinX())
        {
            x=bounds.getMinX();
            dx=-dx;
        }
        if(x+XSIZE >=bounds.getMaxX())
        {
            x=bounds.getMaxX()-XSIZE;
            dx=-dx;
        }
        if(y<bounds.getMinY())
        {
            y=bounds.getMinY();
            dy=-dy;
        }
        if(y+YSIZE >=bounds.getMaxY())
        {
            y=bounds.getMaxY()-YSIZE;
            dy=-dy;
        }
    }    public Ellipse2D getShape()
    {
        return new Ellipse2D.Double(x,y,XSIZE,YSIZE);
    }    private static final int XSIZE = 15;
    private static final int YSIZE = 15;
    private double x =100;
    private double y =200;
    private double dx = 1;
    private double dy = 1;
}class BallPanel extends JPanel
{
    public void add(Ball b)
    {
        balls.add(b);
    }    public void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        for(Ball b : balls)
        {
            g2.fill(b.getShape());
        }
    }
    private ArrayList<Ball> balls = new ArrayList<Ball>();
}
class BounceFrame extends JFrame
{
    public BounceFrame()
    {
        setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
        setTitle("Bounce");        panel = new BallPanel();
        this.getContentPane().add(panel, BorderLayout.CENTER);        JPanel buttonpanel = new JPanel();
        addButton(buttonpanel, "start",
                   new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                panel.getGraphics().clearRect(0,0,450,350);
                addBall();
            }
        });
        this.getContentPane().add(buttonpanel,BorderLayout.SOUTH);
        addButton(buttonpanel, "Close",
                  new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                System.exit(0);
            }
        });    }
    public void addButton(Container c,String title,ActionListener listener)
    {
        JButton button = new JButton(title);
        c.add(button);
        button.addActionListener(listener);
    }    public void addBall()
    {
        try
        {
            Ball ball = new Ball();
            panel.add(ball);            for(int i=1;i<=STEPS;i++)
            {
                ball.move(panel.getBounds());
                panel.paint(panel.getGraphics());
                Thread.sleep(DELAY);
            }
        }
        catch(InterruptedException e)
        {
        }
    }
    private BallPanel panel;
    public static final int DEFAULT_WIDTH=450;
    public static final int DEFAULT_HEIGHT=350;
    public static final int STEPS=1000;
    public static final int DELAY=3;
}可以结账了！