这个游戏大部分人都玩过，界面相当简单，主要就是子弹类，还有飞机类，然后再就是把子弹和飞机加到一个Canvas当中去，然后Canvas添加到JFrame中。
class Ball implements Runnable{ //子弹类
private int X,Y;
private int moveX,moveY;
private int width,height;
private int rX,rY;
private int rMoveX,rMoveY;
private BallCanvas canvas;
private Thread newThread;
public Ball(BallCanvas can){
width =can.getWidth(); //得到画图区的宽
height =can.getHeight(); //得到画图区的高
rX =(int)(height*Math.random());
rY =(int)(width*Math.random());
rMoveX =(int)(40*Math.random());
rMoveY =(int)(40*Math.random());
X =rX; //球的起始点坐标
Y =rY; //球的起始点坐标
moveX =rMoveX; //球位移的距离
moveY =rMoveY; //球位移的距离
canvas =can; //画图时用
newThread=new Thread(this);
newThread.start();
}
public void run(){
while(newThread!=null){
canvas.repaint();
try{
Thread.sleep(50);
}
catch(InterruptedException e){}
X=X+moveX;
Y=Y+moveY;
if(X<=0){
X=0;
moveX=-moveX;
}
if(X>=(width-30)){
X=width-30;
moveX=-moveX;
}
if(Y<=0){
Y=0;
moveY=-moveY;
}
if(Y>=(height-30)){
Y=height-30;
moveY=-moveY;
}
}
}
public void draw(Graphics g){
g.setColor(Color.black);
g.fillOval(X,Y,5,5);
}
}
这个类主要是实现子弹的一些功能，子弹在天上非，其中一个子弹一个线程，
飞机类主要是实现自己控制小飞机的飞行，通过从Canvas中接受到键盘事件来控制飞机的移动，
class Air { //飞机类
private int X,Y; //飞机的坐标
private int width,height; //飞机可以飞到的区域
private BallCanvas canvas; //画图用
//private Thread newThread; //飞机线程
public Air(BallCanvas can){
width =300;
height =400;
X =width/2;
Y =height/2;
canvas =can;
}
public void moveUp(){
this.Y-=10;
if(Y<=0)Y=0;
}
public void moveDown(){
this.Y+=10;
if(Y>=height)Y=height-5;
}
public void moveRight(){
this.X+=10;
if(X>=width)X=width-5;
}
public void moveLeft(){
this.X-=10;
if(X<=0)X=0;
}
public void draw(Graphics g){
g.setColor(Color.red);
g.fillOval(X,Y,5,5);
}
}
最后就是Canvas类实现KeyListener接口，并且paint方法画图
public void paint(Graphics g){
air.draw(g);
for(int i=0;i<balls.length;i++){
balls[i].draw(g);
}
}
public void keyPressed(KeyEvent e){
switch(e.getKeyCode()){
case KeyEvent.VK_UP:
air.moveUp();
repaint();
break;
case KeyEvent.VK_DOWN:
air.moveDown();
repaint();
break;
case KeyEvent.VK_RIGHT:
air.moveRight();
repaint();
break;
case KeyEvent.VK_LEFT:
air.moveLeft();
repaint();
break;
}
}
整个游戏的实现过程大概就是这样的，但是还有些地方没实现，子弹和飞机相遇的判断函数没写，没写过这方面的东西，希望大家给点指示，谢谢。
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