线程睡眠实例 Demo_月食

清疚 2022-04-23 22:58 106阅读 0赞

eg : 实训时跟着敲的实例，没什么想说的，直接奉上代码

>     import javax.swing.*;
>     import java.awt.*;
>     
>     public class EcDemo {
>         public static void main(String[] args) {
>             JFrame jf = new JFrame();
>             jf.setSize(1024, 768);
>             jf.setTitle("月食");
>             jf.setVisible(true);
>             MoonPanel mp = new MoonPanel();
>             jf.add(mp);
>             Thread tad = new Thread(mp);
>             tad.start();
>         }
>     }
>     class MoonPanel extends JPanel implements Runnable {
>         int x = 810, y = 170;       //定义会动的月亮的坐标
>         public void paint(Graphics g) {
>             super.paint(g);
>             this.setBackground(Color.black);
>             /*画月亮*/
>             g.setColor(Color.white);
>             g.fillOval(860, 120, 80, 80);
>             g.setColor(Color.black);
>             g.fillOval(x, y, 80, 80);
>             /*画星星*/
>             for(int i=0;i<30;i++){
>                 int x = (int)(Math.random()*1024);
>                 int y = (int)(Math.random()*768);
>                 g.setColor(Color.yellow);
>                 g.drawString("*",x,y);
>             }
>         }
>         public void run() {
>             while (true) {
>                 x++;
>                 y--;
>                 if (x > 1024 && y < 0) {
>                     x = 810;
>                     y = 170;
>                 }
>                 try {
>                     Thread.sleep(100);//线程睡眠
>                 } catch (InterruptedException e) {
>                     e.printStackTrace();
>                 }
>                 /*每过1毫秒重新调用paint方法*/
>                 repaint();
>             }
>         }
>     }