threadballtest.java

基于netbeans的java桌面应用程序合集

/*
 * ThreadBallTest.java
 *
 * Created on 2007年12月23日, 上午8:29
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package org.xifei;

import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Panel;

/**
 *
 * @author Administrator
 */
public class ThreadBallTest extends Frame{
    
    /** Creates a new instance of ThreadBallTest */
    public ThreadBallTest() {
        super();
        this.setSize(800,600);
        this.setVisible(true);
        this.setLayout(null);
        this.setFocusableWindowState(true);
        ballPanel b1=new ballPanel();
        b1.setBounds(0,0,400,600);
        ballPanel b2=new ballPanel();
        this.add(b1);
        b2.setBounds(400,0,400,600);
        this.add(b2);
        Thread t1=new Thread(b1);
        Thread t2=new Thread(b2);
        t1.start();
        t2.start();
    }
    public static void main(String args[]){
        new ThreadBallTest();
    }
}
class ballPanel extends Panel implements Runnable{
    private int x=(int)(Math.random()*10);
    private int y=(int)(Math.random()*100);
    private boolean bx=false;
    private boolean by=false;
    public void paint(Graphics g){
        g.fillOval(x,y,15,15);
    }
    public void run(){
        while(true){
            if(x>400)
                bx=true;
            if(x<0)
                bx=false;
            if(y>600)
                by=true;
            if(y<0)
                by=false;
            if(bx)
                x--;
            else
                x++;
            if(by)
                y--;
            else
                y++;
            
            try {
                Thread.sleep(20);
            } catch (InterruptedException ex) {
                ex.printStackTrace();
            }
            this.repaint();
        }
    }
}