/** 程序的主窗体*/
public class FrmMain extends JFrame {/** 初始的一些全局变量 1是否存活 2方向 3子弹数量 4飞机*/// 1是否存活public static boolean isRun = true;// 2方向public static boolean right, left, up, down;// 3子弹数量public static int num = 30;// 4飞机private JLabel plane;public FrmMain() {isRun=true;// 设置大小setSize(400, 600);// 设置居中setLocationRelativeTo(null);// 设置点关闭时，程序退出setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);// 得到内容面板final Container c = getContentPane();c.setBackground(Color.BLACK);// 设置标题setTitle("是男人就坚持20秒");// 设置绝对定位c.setLayout(null);// 添加标签final JLabel lblDesc = new JLabel("是男人就坚持20秒");lblDesc.setBounds(133, 175, 113, 31);lblDesc.setForeground(Color.WHITE);c.add(lblDesc);// 添加按钮final JButton btnStart = new JButton("开始");btnStart.setBounds(133, 210, 113, 31);c.add(btnStart);// 设置可见setVisible(true);//设置内容面板获取焦点c.setFocusable(true);/** 增加键盘事件*/c.addKeyListener(new KeyAdapter() {// 按下,具体实现，即为按钮把对应的方向设置为true@Overridepublic void keyPressed(KeyEvent e) {switch (e.getKeyCode()) {case KeyEvent.VK_LEFT:left=true;break;case KeyEvent.VK_RIGHT:right=true;    break;case KeyEvent.VK_UP:up=true;break;case KeyEvent.VK_DOWN:down=true;break;}}// 释放，把当前方向再设置成false@Overridepublic void keyReleased(KeyEvent e) {switch (e.getKeyCode()) {case KeyEvent.VK_LEFT:left=false;break;case KeyEvent.VK_RIGHT:right=false;   break;case KeyEvent.VK_UP:up=false;break;case KeyEvent.VK_DOWN:down=false;break;}}});/** 增加鼠标的点击事件*/btnStart.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {//把当前标签和按钮隐藏btnStart.setVisible(false);lblDesc.setVisible(false);//飞机plane = new JLabel(new ImageIcon("img/plane.png"));plane.setBounds(150, 400, 33, 33);c.add(plane);//刷新页面plane.updateUI();//飞机实现 移动new MoveThread(plane,c).start();//计时器new TimerThread(c).start();//子弹for(int i=0;i<num;i++){new BulletThread(c,plane,FrmMain.this).start();}}});}/** 程序的入口*/public static void main(String[] args) {// new 就是一个对象new FrmMain();}
}

/** 飞机移动的线程类*/
public class MoveThread extends Thread {//飞行速度private int speed=5;//飞机private JLabel plane;//内容面板private Container c;public MoveThread(JLabel plane, Container c) {this.plane=plane;this.c=c;}/** 飞机运算的线程实现* @see java.lang.Thread#run()*/@Overridepublic void run() {while(FrmMain.isRun){if(FrmMain.left){//设置左飞机plane.setIcon(new ImageIcon("img/planeLeft.png"));//如果是超过左边边缘，x轴则设置为零if(plane.getX()-speed<0){plane.setLocation(0, plane.getY());}else{plane.setLocation(plane.getX()-speed, plane.getY());}}else if(FrmMain.right){//设置成右飞机    plane.setIcon(new ImageIcon("img/planeRight.png"));//如果x轴+飞宽+移动大小超过内容面板，则设置最靠右(内容面板-飞机宽的x轴大小)if(plane.getX()+plane.getWidth()+speed>c.getWidth()){plane.setLocation(c.getWidth()-plane.getWidth(), plane.getY());}else{plane.setLocation(plane.getX()+speed, plane.getY());}}else if(FrmMain.up){//正飞机plane.setIcon(new ImageIcon("img/plane.png"));//如果飞最上面，超过边界后，作的处理if(plane.getY()-speed<0){plane.setLocation(plane.getX(), 0);}else{plane.setLocation(plane.getX(), plane.getY()-speed);}}else if(FrmMain.down){//正飞机plane.setIcon(new ImageIcon("img/plane.png"));//如果飞最下面，超过边界后，作的处理if(plane.getY()+speed+plane.getHeight()>c.getHeight()){plane.setLocation(plane.getX(), c.getHeight()-plane.getHeight());}else{plane.setLocation(plane.getX(), plane.getY()+speed);}}//在线程时，间隔50毫秒执行一回try {sleep(50);} catch (InterruptedException e) {e.printStackTrace();}}}
}

/** 子弹线程*/
public class BulletThread extends Thread {// 内容面板private Container c;// 飞机private JLabel plane;// 子弹private JLabel lblBullet;// x轴速度private int xSpeed;// y轴速度private int ySpeed;private FrmMain frmMain;public BulletThread(Container c, JLabel plane, FrmMain frmMain) {this.c = c;this.plane = plane;this.frmMain=frmMain;// 随机类Random random = new Random();// 创建 子弹lblBullet = new JLabel(new ImageIcon("img/bullet.png"));lblBullet.setLocation(random.nextInt(c.getWidth()), random.nextInt(c.getHeight()/2));// 随机x轴速度xSpeed = random.nextInt(5) + 1;// 随机y轴速度ySpeed = random.nextInt(5) + 1;c.add(lblBullet);}// 张程实现@Overridepublic void run() {while (FrmMain.isRun) {//子弹超过上下左右边缘的处理if (lblBullet.getX() < 0 || lblBullet.getX() > c.getWidth()) {xSpeed = -xSpeed;}if (lblBullet.getY() < 0 || lblBullet.getY() > c.getHeight()) {ySpeed=-ySpeed;}lblBullet.setBounds(lblBullet.getX()+xSpeed, lblBullet.getY()+ySpeed, 12, 12);//判断子弹与飞机的交集if(lblBullet.getBounds().intersects(plane.getBounds())){//结束 FrmMain.isRun=false;//爆炸int x = plane.getX()-plane.getWidth();int y=  plane.getY()-plane.getHeight();//启动爆炸线程new ExplosionThread(x,y,c,plane,frmMain).start();}try {sleep(40);} catch (InterruptedException e) {e.printStackTrace();}}}
}

/** 计时线程*/
public class TimerThread extends Thread {//内容面板 private Container  c;public TimerThread(Container c) {this.c=c;}//线程实现 @Overridepublic void run() {//1添加JLabel 00:JLabel lblTime = new JLabel("00:00");lblTime.setBounds(350, 0, 50, 20);lblTime.setForeground(Color.YELLOW);c.add(lblTime);lblTime.updateUI();//2获取当前时间long start = System.currentTimeMillis();//3刷新DecimalFormat df = new DecimalFormat("00");while(FrmMain.isRun){long x = System.currentTimeMillis()-start;int second= (int)(x/1000);int mSecond=(int)(x%1000/10); lblTime.setText(df.format(second)+":"+df.format(mSecond));//休眠50毫秒try {Thread.sleep(50);} catch (InterruptedException e) {e.printStackTrace();}}}
}

/** 爆炸线程*/
public class ExplosionThread extends Thread {private int x;private int y;private Container c;private JLabel plane;//最先的窗体private FrmMain frmMain;public ExplosionThread(int x, int y, Container c, JLabel plane, FrmMain frmMain) {this.x=x;this.y=y;this.c=c;this.plane=plane;this.frmMain=frmMain;}//线程实现@Overridepublic void run() {//爆炸的起始图片JLabel lblExplosion =new JLabel(new ImageIcon("img/explosion2-1.png"));lblExplosion.setBounds(x, y, 128, 128);c.add(lblExplosion);plane.setVisible(false);//爆炸的动画图片for(int i=1;i<72;i++){lblExplosion.setIcon(new ImageIcon("img/explosion2-"+i+".png"));try {sleep(50);} catch (InterruptedException e) {e.printStackTrace();}}//提示消息JLabel lblEnd = new JLabel("Game Over");lblEnd.setForeground(Color.RED);lblEnd.setBounds(160, 200, 100, 50);c.add(lblEnd);//再来一局JButton btnAgain = new JButton("再来一局");btnAgain.setBounds(150, 250, 100, 50);c.add(btnAgain);lblEnd.updateUI();btnAgain.updateUI();//再来一局的事件btnAgain.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {new FrmMain();frmMain.setVisible(false);}});}}

以上就是这个小游戏的所有代码实现部分，总共不到400行代码，快写一个试试吧。