我试着做个坦克大战游戏，但是今晚就出问题了：就是每次把鼠标单击一下界面后，程序就不受控制了，监听不到任何消息了，求大神帮忙!代码如下:
- Java code
import java.awt.Color;import java.awt.Graphics;import java.awt.Panel;import java.awt.event.*;import java.awt.event.KeyEvent;import java.awt.event.KeyListener;import javax.swing.*;public class Yumentank extends JFrame{Mypanel1 mp=null;Yumentank(){ mp=new Mypanel1(); this.addKeyListener(mp); this.add(mp); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setSize(500,400); this.setVisible(true);} public static void main(String[] args) { // TODO Auto-generated method stub Yumentank mytank=new Yumentank(); }}//坦克基类class Tank{ int x; int y; int direction; int speed=1; Tank(int x,int y) { this.x=x; this.y=y; } public void setX(int x) { this.x=x; } public void setY(int y) { this.y=y; } public int getX() { return this.x; } public int getY() { return this.y; } public void setDirction(int n) { direction=n; } public int getDirection() { return direction; }}//我的坦克class Mytank extends Tank{ Mytank(int x,int y) { super(x,y); speed=3; } public void goUp() { direction=0; y-=speed; } public void goDown() { direction=1; y+=speed; } public void goLeft() { direction=2; x-=speed; } public void goRight() { direction=3; x+=speed; }}//面板class Mypanel1 extends Panel implements KeyListener{ Mytank tank; Mypanel1(){ tank=new Mytank(0,0); } public void paint(Graphics g) { super.paint(g); this.drawTank(g, tank.getX(), tank.getY(),0,tank.getDirection()); } public void drawTank(Graphics g,int x,int y,int type,int direct) { switch(direct)//go up { case 0: { g.setColor(Color.DARK_GRAY); g.fill3DRect(0, 0, 500, 400, false); g.setColor(Color.blue); g.fill3DRect(x, y, 10, 40,false); g.fill3DRect(x+30, y, 10, 40,false); g.fill3DRect(x+10, y+10, 20, 20,false); g.setColor(Color.lightGray); g.fillOval(x+10, y+13, 20, 15); g.fill3DRect(x+18, y, 3, 20,false); break; } case 1://gou down { g.setColor(Color.DARK_GRAY); g.fill3DRect(0, 0, 500, 400, false); g.setColor(Color.blue); g.fill3DRect(x, y, 10, 40,false); g.fill3DRect(x+30, y, 10, 40,false); g.fill3DRect(x+10, y+10, 20, 20,false); g.setColor(Color.lightGray); g.fillOval(x+10, y+13, 20, 15); g.fill3DRect(x+18, y+20, 3, 20,false); break; } case 2: //go left { g.setColor(Color.DARK_GRAY); g.fill3DRect(0, 0, 500, 400, false); g.setColor(Color.BLUE); g.fill3DRect(x, y, 40, 10,false); g.fill3DRect(x, y+30, 40, 10,false); g.fill3DRect(x+10, y+10, 20, 20,false); g.setColor(Color.lightGray); g.fillOval(x+12, y+11, 15, 20); g.fill3DRect(x, y+20, 20, 3,false); break; } case 3://go right { g.setColor(Color.DARK_GRAY); g.fill3DRect(0, 0, 500, 400, false); g.setColor(Color.BLUE); g.fill3DRect(x, y, 40, 10,false); g.fill3DRect(x, y+30, 40, 10,false); g.fill3DRect(x+10, y+10, 20, 20,false); g.setColor(Color.lightGray); g.fillOval(x+12, y+11, 15, 20); g.fill3DRect(x+20, y+20, 20, 3,false); break; } } } @Override public void keyPressed(KeyEvent arg0) { // TODO Auto-generated method stub if(arg0.getKeyCode()==KeyEvent.VK_UP) { this.tank.direction=0; this.tank.goUp(); //System.out.println("go up"); } else if(arg0.getKeyCode()==KeyEvent.VK_DOWN) { this.tank.direction=1; this.tank.goDown(); } else if(arg0.getKeyCode()==KeyEvent.VK_LEFT) { this.tank.direction=2; this.tank.goLeft(); } else if(arg0.getKeyCode()==KeyEvent.VK_RIGHT) { this.tank.direction=3; this.tank.goRight(); } this.repaint(); } @Override public void keyReleased(KeyEvent arg0) { // TODO Auto-generated method stub } @Override public void keyTyped(KeyEvent arg0) { // TODO Auto-generated method stub }}