java项目之——坦克大战 04

功能：让坦克动起来

内容：改变位置，坦克就会动。a.设置成员变量，x  ,  y;

                                                        b.每一段时间重画一次：y+=5;

                                                        c.重画线程类。（优点：线程重画坦克，比较均匀。）

public class TankClient extends Frame {int x = 30; int y = 30;                //定义在方法外面public void paint(Graphics g) {Color c = g.getColor();g.setColor(Color.RED);g.fillOval(x, y, 30, 40);g.setColor(c);y += 5;}public void lauchFrame(){this.setSize(800,600);this.setTitle("TankWar");this.setLocation(80, 60);this.setVisible(true);this.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e) {    System.exit(0);}});this.setResizable(false);new Thread(new paintThread()).start();}public static void main(String[] args) {TankClient tc = new TankClient();tc.lauchFrame();}private class paintThread implements Runnable {   //线程 内部类 为此线程服务public void run() {while(true){repaint();try {Thread.sleep(50);} catch (Exception e) {e.printStackTrace();}}}}}

关键代码：线程。

private class paintThread implements Runnable {   //线程 内部类 为此线程服务public void run() {while(true){repaint();try {Thread.sleep(50);} catch (Exception e) {e.printStackTrace();}}}}

实现Runnable接口，repaint（）方法一直重画，延时时间sleep（50）

启动线程：

new Thread(new paintThread()).start();