雪花飘 多线程java

import java.awt.*; import java.math.*; import java.net.URL; import java.util.Random; import javax.swing.*; import javax.swing.event.*; public class ThreadTest1 extends JFrame{ /** * */ private static final long serialVersionUID = 7169079811644478262L; Container ct=getContentPane(); URL url=ThreadTest1.class.getResource("/1.gif"); Icon ic=new ImageIcon(url);; public ThreadTest1() { setBounds(200,200,400,400); ct.setLayout(null); for(int i=0;i<40;i++) new showIcon(i*10, 0).start(); setVisible(true); } class showIcon extends Thread { int xa,xb,ya,yb; JLabel jb1=new JLabel(); public showIcon(int x1,int y1) { // TODO 自动生成的构造函数存根 jb1.setIcon(ic); xa=xb=x1; ya=yb=y1; jb1.setBounds(x1, y1, 50, 50); ct.add(jb1); } public void run() { for(;;) { if(xa>=400 || xa<0) xa=xb; if(ya>=400 || xa<0) ya=yb; xa+=(int)(-5+Math.random()*10); ya+=(int)(-4+Math.random()*10); jb1.setBounds(xa,ya,50,50); try { Thread.sleep(10); } catch (Exception e) { // TODO: handle exception } } } } public static void main(String[] args) { // TODO 自动生成的方法存根 new ThreadTest1(); } }