import java.awt.Graphics;

import java.util.ArrayList;

import javax.swing.JFrame;

import javax.swing.JPanel;

public class PlaneMain extends JPanel {

    public static void main(String[] args) {

        new PlaneMain();

    }

    private ArrayList<View> list;

    public PlaneMain() {

        list = new ArrayList<View>();

        View background = new View("background.jpg", 0, -60, 700, 460, 2, this);

        list.add(background);

        initUI();

    }

    private void initUI() {

        JFrame frame = new JFrame("飞机大战");

        frame.setSize(700, 400);

        frame.setDefaultCloseOperation(3);

        frame.setLocationRelativeTo(null);

        frame.setResizable(false);

        frame.add(this);

        frame.setVisible(true);

        AddListener al = new AddListener(this, list);

        this.addMouseListener(al);

        Thread t = new Thread(al);

        t.start();// 启动线程

    }

    /**

     * 重写JPanel的重绘方法

     */

    public void paint(Graphics g) {

        super.paint(g);

        for (int i = 0; i < list.size(); i++) {

            View v = list.get(i);

            g.drawImage(v.getBackground(), v.getX(), v.getY(), v.getWidth(),

                    v.getHeight(), this);

        }

    }

}

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.util.ArrayList;

import javax.swing.JPanel;

public class AddListener extends MouseAdapter implements Runnable {

    private int count = 0;

    private JPanel panel;

    private ArrayList<View> list;

    public AddListener(JPanel panel, ArrayList<View> list) {

        this.panel = panel;

        this.list = list;

    }

    public void mouseReleased(MouseEvent e) {

        if (count % 2 == 0) {

            View plane = new View("plane.jpg", e.getX(), e.getY(), 50, 50, 3,

                    panel);

            list.add(plane);

            count++;

        } else {

            View bullet = new View("bullet.png", e.getX(), e.getY(), 10, 20, 5,

                    panel);

            list.add(bullet);

            count++;

        }

    }

    public void run() {

        while (true) {

            for (int i = 0; i < list.size(); i++) {

                View v = list.get(i);

                v.move();

                if(i!=0)

                    v.collisions(list);

            }

            panel.repaint();

            try {

                Thread.sleep(100);

            } catch (InterruptedException e) {

                e.printStackTrace();

            }

        }

    }

}

import java.awt.Image;

import java.util.ArrayList;

import javax.swing.ImageIcon;

import javax.swing.JPanel;

public class View {

    private Image background;

    private int x = 0, y = -60, moveY, width, height;

    private JPanel panel;

    private String imageName;

    /**

     * 构造方法

     *

     * @param background背景图片的对象

     * @param x起始X坐标

     * @param y起始Y坐标

     */

    public View(String imageName, int x, int y, int width, int height,

            int moveY, JPanel panel) {

        this.imageName = imageName;

        this.background = new ImageIcon(this.getClass().getResource(imageName))

                .getImage();

        this.x = x;

        this.y = y;

        this.width = width;

        this.height = height;

        this.moveY = moveY;

        this.panel = panel;

    }

    public int getWidth() {

        return width;

    }

    public void setWidth(int width) {

        this.width = width;

    }

    public int getHeight() {

        return height;

    }

    public void setHeight(int height) {

        this.height = height;

    }

    public Image getBackground() {

        return background;

    }

    public void setBackground(Image background) {

        this.background = background;

    }

    public int getX() {

        return x;

    }

    public void setX(int x) {

        this.x = x;

    }

    public int getY() {

        return y;

    }

    public void setY(int y) {

        this.y = y;

    }

    public int getMoveY() {

        return moveY;

    }

    public void setMoveY(int moveY) {

        this.moveY = moveY;

    }

    public JPanel getPanel() {

        return panel;

    }

    public void setPanel(JPanel panel) {

        this.panel = panel;

    }

    public void move() {

        if (imageName.equals("background.jpg")) {

            y += moveY;

            if (y == 0)

                y = -60;

        } else if (imageName.equals("bullet.png")) {

            y += moveY;

            if (y >= 400)

                y = 0;

        } else if (imageName.equals("plane.jpg")) {

            y -= moveY;

            if (y <= 0)

                y = 400;

        }

    }

    /**

     * 碰撞方法

     */

    public void collisions(ArrayList<View> list) {

        for (int i = 1; i < list.size(); i++) {

            View v = list.get(i);

            if (this != v) {

                double distance = Math.sqrt((this.x - v.x) * (this.x - v.x)

                        + Math.pow(this.y - v.y, 2));

                if (distance <= this.height + v.height) {

                    System.out.println(v.imageName + "和" + this.imageName

                            + "发生了碰撞");

                }

            }

        }

    }

}