一、代码如下

package www.tainiu.gui__V2;import java.awt.Color;import java.awt.Graphics;import java.awt.event.KeyEvent;import java.awt.event.KeyListener;import java.util.Vector;import javax.swing.JFrame;import javax.swing.JPanel;public class af__TankGame__V2 extends JFrame{	myPanel_V2 mp= null;	public static void main(String[] args) {		// TODO Auto-generated method stub		af__TankGame__V2 tv= new af__TankGame__V2();	}		public af__TankGame__V2() {		// TODO Auto-generated constructor stub		mp = new myPanel_V2();		this.add(mp);		this.setSize(400, 300);		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);		this.setVisible(true);		//绑定监听		this.addKeyListener(mp);	}}class Tank_V2 {	int x = 0;	int y = 0;	int direct= 1;	int speed= 20;		public Tank_V2(int x, int y) {		// TODO Auto-generated constructor stub		this.x = x;		this.y = y;	}}//敌人坦克class DRTank extends Tank_V2{	public DRTank(int x, int y) {		super(x, y);		// TODO Auto-generated constructor stub	}	}//自己坦克class Hero_V2 extends Tank_V2 {		public Hero_V2(int x, int y) {			// TODO Auto-generated constructor stub			super(x, y);		}}class myPanel_V2 extends JPanel implements KeyListener {	Hero_V2 hero = null;		//DRTank drt= null;	Vector
     
       dts= new Vector<>();	int dtsSize= 3;	public myPanel_V2() {		// TODO Auto-generated constructor stub		hero = new Hero_V2(10, 10);		for(int i=0; i