分析

飞机大战 首先对这个游戏分析,在屏幕上的物体都是飞行物,我们可以把建一个类,让其他飞行物继承这个类.游戏中应有英雄机(也就是自己控制的飞机)、敌人。而敌人应该分为打死给分的飞机（就是普通飞机），另一种就是打死有奖励的敌人。他们都应该是飞行物的子类，我们也可以为普通飞机和给奖励的敌人设一个接口让他们去实现接口，这样有利于以后的扩展，我在这里给的简化版的飞机大战，主要是为了让大家了解面向对象。

第一步建立飞行物类

import java.awt.image.BufferedImage;/*** 飞行物(敌机，蜜蜂，子弹，英雄机)*/
public abstract class FlyingObject {protected int x;    //x坐标protected int y;    //y坐标protected int width;    //宽protected int height;   //高protected BufferedImage image;   //图片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 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 BufferedImage getImage() {return image;}public void setImage(BufferedImage image) {this.image = image;}/*** 检查是否出界* @return true 出界与否*/public abstract boolean outOfBounds();/*** 飞行物移动一步*/public abstract void step();/*** 检查当前飞行物体是否被子弹(x,y)击(shoot)中* @param Bullet 子弹对象* @return true表示被击中了*/public boolean shootBy(Bullet bullet){int x = bullet.x;  //子弹横坐标int y = bullet.y;  //子弹纵坐标return this.x<x && x<this.x+width && this.y<y && y<this.y+height;}}

第二步创建英雄级类

import java.awt.image.BufferedImage;/*** 英雄机:是飞行物*/
public class Hero extends FlyingObject{private BufferedImage[] images = {};  //英雄机图片private int index = 0;                //英雄机图片切换索引private int doubleFire;   //双倍火力private int life;   //命/** 初始化数据 */public Hero(){life = 3;   //初始3条命doubleFire = 0;   //初始火力为0images = new BufferedImage[]{ShootGame.hero0, ShootGame.hero1}; //英雄机图片数组image = ShootGame.hero0;   //初始为hero0图片width = image.getWidth();height = image.getHeight();x = 150;y = 400;}/** 获取双倍火力 */public int isDoubleFire() {return doubleFire;}/** 设置双倍火力 */public void setDoubleFire(int doubleFire) {this.doubleFire = doubleFire;}/** 增加火力 */public void addDoubleFire(){doubleFire = 40;}/** 增命 */public void addLife(){  //增命life++;}/** 减命 */public void subtractLife(){   //减命life--;}/** 获取命 */public int getLife(){return life;}/** 当前物体移动了一下，相对距离，x,y鼠标位置  */public void moveTo(int x,int y){   this.x = x - width/2;this.y = y - height/2;}/** 越界处理 */@Overridepublic boolean outOfBounds() {return false;  }/** 发射子弹 */public Bullet[] shoot(){   int xStep = width/4;      //4半int yStep = 20;  //步if(doubleFire>0){  //双倍火力Bullet[] bullets = new Bullet[2];bullets[0] = new Bullet(x+xStep,y-yStep);  //y-yStep(子弹距飞机的位置)bullets[1] = new Bullet(x+3*xStep,y-yStep);return bullets;}else{      //单倍火力Bullet[] bullets = new Bullet[1];bullets[0] = new Bullet(x+2*xStep,y-yStep);  return bullets;}}/** 移动 */@Overridepublic void step() {if(images.length>0){image = images[index++/10%images.length];  //切换图片hero0，hero1}}/** 碰撞算法 */public boolean hit(FlyingObject other){int x1 = other.x - this.width/2;                 //x坐标最小距离int x2 = other.x + this.width/2 + other.width;   //x坐标最大距离int y1 = other.y - this.height/2;                //y坐标最小距离int y2 = other.y + this.height/2 + other.height; //y坐标最大距离int herox = this.x + this.width/2;               //英雄机x坐标中心点距离int heroy = this.y + this.height/2;              //英雄机y坐标中心点距离return herox>x1 && herox<x2 && heroy>y1 && heroy<y2;   //区间范围内为撞上了}}

第三步：建立敌人接口（普通敌人）

/*** 敌人，可以有分数*/
public interface Enemy {/** 敌人的分数  */int getScore();
}

第四步建立给奖励的敌人接口（就是特殊的敌人）

/*** 奖励*/
public interface Award {int DOUBLE_FIRE = 0;  //双倍火力int LIFE = 1;   //1条命/** 获得奖励类型(上面的0或1) */int getType();
}

第五步：普通敌人对象

import java.util.Random;/*** 敌飞机: 是飞行物，也是敌人*/
public class Airplane extends FlyingObject implements Enemy {private int speed = 3;  //移动步骤/** 初始化数据 */public Airplane(){this.image = ShootGame.airplane;width = image.getWidth();height = image.getHeight();y = -height;          Random rand = new Random();x = rand.nextInt(ShootGame.WIDTH - width);}/** 获取分数 */@Overridepublic int getScore() {  return 5;}/** //越界处理 */@Overridepublic  boolean outOfBounds() {   return y>ShootGame.HEIGHT;}/** 移动 */@Overridepublic void step() {   y += speed;}}

第六步 特殊敌人（有奖励特殊的敌人）

import java.util.Random;/** 蜜蜂 */
public class Bee extends FlyingObject implements Award{private int xSpeed = 1;   //x坐标移动速度private int ySpeed = 2;   //y坐标移动速度private int awardType;    //奖励类型/** 初始化数据 */public Bee(){this.image = ShootGame.bee;width = image.getWidth();height = image.getHeight();y = -height;Random rand = new Random();x = rand.nextInt(ShootGame.WIDTH - width);awardType = rand.nextInt(2);   //初始化时给奖励}/** 获得奖励类型 */public int getType(){return awardType;}/** 越界处理 */@Overridepublic boolean outOfBounds() {return y>ShootGame.HEIGHT;}/** 移动，可斜着飞 */@Overridepublic void step() {      x += xSpeed;y += ySpeed;if(x > ShootGame.WIDTH-width){  xSpeed = -1;}if(x < 0){xSpeed = 1;}}
}

第七步 子弹类的建立（子弹也是飞行物）

/*** 子弹类:是飞行物*/
public class Bullet extends FlyingObject {private int speed = 3;  //移动的速度/** 初始化数据 */public Bullet(int x,int y){this.x = x;this.y = y;this.image = ShootGame.bullet;}/** 移动 */@Overridepublic void step(){   y-=speed;}/** 越界处理 */@Overridepublic boolean outOfBounds() {return y<-height;}}

最后一部分

我们的主类来了，我们的准备工作就完了
激动的时刻来了

import java.awt.Font;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.Arrays;
import java.util.Random;
import java.util.Timer;
import java.util.TimerTask;
import java.awt.image.BufferedImage;import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;public class ShootGame extends JPanel {public static void main(String[] args) {JFrame frame = new JFrame("Fly");ShootGame game = new ShootGame(); // 面板对象frame.add(game); // 将面板添加到JFrame中frame.setSize(WIDTH, HEIGHT); // 设置大小frame.setAlwaysOnTop(true); // 设置其总在最上frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 默认关闭操作frame.setIconImage(new ImageIcon("images/icon.jpg").getImage()); // 设置窗体的图标frame.setLocationRelativeTo(null); // 设置窗体初始位置frame.setVisible(true); // 尽快调用paintgame.action(); // 启动执行}public static final int WIDTH = 400; // 面板宽public static final int HEIGHT = 654; // 面板高/** 游戏的当前状态: START RUNNING PAUSE GAME_OVER */private int state;private static final int START = 0;private static final int RUNNING = 1;private static final int PAUSE = 2;private static final int GAME_OVER = 3;private int score = 0; // 得分private Timer timer; // 定时器private int intervel = 1000 / 100; // 时间间隔(毫秒)public static BufferedImage background;public static BufferedImage start;public static BufferedImage airplane;public static BufferedImage bee;public static BufferedImage bullet;public static BufferedImage hero0;public static BufferedImage hero1;public static BufferedImage pause;public static BufferedImage gameover;private FlyingObject[] flyings = {}; // 敌机数组private Bullet[] bullets = {}; // 子弹数组private Hero hero = new Hero(); // 英雄机static { // 静态代码块，初始化图片资源try {background = ImageIO.read(ShootGame.class.getResource("background.png"));start = ImageIO.read(ShootGame.class.getResource("start.png"));airplane = ImageIO.read(ShootGame.class.getResource("airplane.png"));bee = ImageIO.read(ShootGame.class.getResource("bee.png"));bullet = ImageIO.read(ShootGame.class.getResource("bullet.png"));hero0 = ImageIO.read(ShootGame.class.getResource("hero0.png"));hero1 = ImageIO.read(ShootGame.class.getResource("hero1.png"));pause = ImageIO.read(ShootGame.class.getResource("pause.png"));gameover = ImageIO.read(ShootGame.class.getResource("gameover.png"));} catch (Exception e) {e.printStackTrace();}}/** 画 */@Overridepublic void paint(Graphics g) {g.drawImage(background, 0, 0, null); // 画背景图paintHero(g); // 画英雄机paintBullets(g); // 画子弹paintFlyingObjects(g); // 画飞行物paintScore(g); // 画分数paintState(g); // 画游戏状态}/** 画英雄机 */public void paintHero(Graphics g) {g.drawImage(hero.getImage(), hero.getX(), hero.getY(), null);}/** 画子弹 */public void paintBullets(Graphics g) {for (int i = 0; i < bullets.length; i++) {Bullet b = bullets[i];g.drawImage(b.getImage(), b.getX() - b.getWidth() / 2, b.getY(),null);}}/** 画飞行物 */public void paintFlyingObjects(Graphics g) {for (int i = 0; i < flyings.length; i++) {FlyingObject f = flyings[i];g.drawImage(f.getImage(), f.getX(), f.getY(), null);}}/** 画分数 */public void paintScore(Graphics g) {int x = 10; // x坐标int y = 25; // y坐标Font font = new Font(Font.SANS_SERIF, Font.BOLD, 14); // 字体g.setColor(new Color(0x3A3B3B));g.setFont(font); // 设置字体g.drawString("SCORE:" + score, x, y); // 画分数y += 20; // y坐标增20g.drawString("LIFE:" + hero.getLife(), x, y); // 画命}/** 画游戏状态 */public void paintState(Graphics g) {switch (state) {case START: // 启动状态g.drawImage(start, 0, 0, null);break;case PAUSE: // 暂停状态g.drawImage(pause, 0, 0, null);break;case GAME_OVER: // 游戏终止状态g.drawImage(gameover, 0, 0, null);break;}}/** 启动执行代码 */public void action() {// 鼠标监听事件MouseAdapter l = new MouseAdapter() {@Overridepublic void mouseMoved(MouseEvent e) { // 鼠标移动if (state == RUNNING) { // 运行状态下移动英雄机--随鼠标位置int x = e.getX();int y = e.getY();hero.moveTo(x, y);}}@Overridepublic void mouseEntered(MouseEvent e) { // 鼠标进入if (state == PAUSE) { // 暂停状态下运行state = RUNNING;}}@Overridepublic void mouseExited(MouseEvent e) { // 鼠标退出if (state != GAME_OVER&&state!=START) { // 游戏未结束，则设置其为暂停state = PAUSE;}}@Overridepublic void mouseClicked(MouseEvent e) { // 鼠标点击switch (state) {case START:state = RUNNING; // 启动状态下运行break;case GAME_OVER: // 游戏结束，清理现场flyings = new FlyingObject[0]; // 清空飞行物bullets = new Bullet[0]; // 清空子弹hero = new Hero(); // 重新创建英雄机score = 0; // 清空成绩state = START; // 状态设置为启动break;}}};this.addMouseListener(l); // 处理鼠标点击操作this.addMouseMotionListener(l); // 处理鼠标滑动操作timer = new Timer(); // 主流程控制timer.schedule(new TimerTask() {@Overridepublic void run() {if (state == RUNNING) { // 运行状态enterAction(); // 飞行物入场stepAction(); // 走一步shootAction(); // 英雄机射击bangAction(); // 子弹打飞行物outOfBoundsAction(); // 删除越界飞行物及子弹checkGameOverAction(); // 检查游戏结束}repaint(); // 重绘，调用paint()方法}}, intervel, intervel);}int flyEnteredIndex = 0; // 飞行物入场计数/** 飞行物入场 */public void enterAction() {flyEnteredIndex++;if (flyEnteredIndex % 40 == 0) { // 400毫秒生成一个飞行物--10*40FlyingObject obj = nextOne(); // 随机生成一个飞行物flyings = Arrays.copyOf(flyings, flyings.length + 1);flyings[flyings.length - 1] = obj;}}/** 走一步 */public void stepAction() {for (int i = 0; i < flyings.length; i++) { // 飞行物走一步FlyingObject f = flyings[i];f.step();}for (int i = 0; i < bullets.length; i++) { // 子弹走一步Bullet b = bullets[i];b.step();}hero.step(); // 英雄机走一步}/** 飞行物走一步 */public void flyingStepAction() {for (int i = 0; i < flyings.length; i++) {FlyingObject f = flyings[i];f.step();}}int shootIndex = 0; // 射击计数/** 射击 */public void shootAction() {shootIndex++;if (shootIndex % 30 == 0) { // 300毫秒发一颗Bullet[] bs = hero.shoot(); // 英雄打出子弹bullets = Arrays.copyOf(bullets, bullets.length + bs.length); // 扩容System.arraycopy(bs, 0, bullets, bullets.length - bs.length,bs.length); // 追加数组}}/** 子弹与飞行物碰撞检测 */public void bangAction() {for (int i = 0; i < bullets.length; i++) { // 遍历所有子弹Bullet b = bullets[i];bang(b); // 子弹和飞行物之间的碰撞检查}}/** 删除越界飞行物及子弹 */public void outOfBoundsAction() {int index = 0; // 索引FlyingObject[] flyingLives = new FlyingObject[flyings.length]; // 活着的飞行物for (int i = 0; i < flyings.length; i++) {FlyingObject f = flyings[i];if (!f.outOfBounds()) {flyingLives[index++] = f; // 不越界的留着}}flyings = Arrays.copyOf(flyingLives, index); // 将不越界的飞行物都留着index = 0; // 索引重置为0Bullet[] bulletLives = new Bullet[bullets.length];for (int i = 0; i < bullets.length; i++) {Bullet b = bullets[i];if (!b.outOfBounds()) {bulletLives[index++] = b;}}bullets = Arrays.copyOf(bulletLives, index); // 将不越界的子弹留着}/** 检查游戏结束 */public void checkGameOverAction() {if (isGameOver()) {state = GAME_OVER; // 改变状态}}/** 检查游戏是否结束 */public boolean isGameOver() {for (int i = 0; i < flyings.length; i++) {int index = -1;FlyingObject obj = flyings[i];if (hero.hit(obj)) { // 检查英雄机与飞行物是否碰撞hero.subtractLife(); // 减命hero.setDoubleFire(0); // 双倍火力解除index = i; // 记录碰上的飞行物索引}if (index != -1) {FlyingObject t = flyings[index];flyings[index] = flyings[flyings.length - 1];flyings[flyings.length - 1] = t; // 碰上的与最后一个飞行物交换flyings = Arrays.copyOf(flyings, flyings.length - 1); // 删除碰上的飞行物}}return hero.getLife() <= 0;}/** 子弹和飞行物之间的碰撞检查 */public void bang(Bullet bullet) {int index = -1; // 击中的飞行物索引for (int i = 0; i < flyings.length; i++) {FlyingObject obj = flyings[i];if (obj.shootBy(bullet)) { // 判断是否击中index = i; // 记录被击中的飞行物的索引break;}}if (index != -1) { // 有击中的飞行物FlyingObject one = flyings[index]; // 记录被击中的飞行物FlyingObject temp = flyings[index]; // 被击中的飞行物与最后一个飞行物交换flyings[index] = flyings[flyings.length - 1];flyings[flyings.length - 1] = temp;flyings = Arrays.copyOf(flyings, flyings.length - 1); // 删除最后一个飞行物(即被击中的)// 检查one的类型(敌人加分，奖励获取)if (one instanceof Enemy) { // 检查类型，是敌人，则加分Enemy e = (Enemy) one; // 强制类型转换score += e.getScore(); // 加分} else if (one instanceof Award) { // 若为奖励，设置奖励Award a = (Award) one;int type = a.getType(); // 获取奖励类型switch (type) {case Award.DOUBLE_FIRE:hero.addDoubleFire(); // 设置双倍火力break;case Award.LIFE:hero.addLife(); // 设置加命break;}}}}/*** 随机生成飞行物* * @return 飞行物对象*/public static FlyingObject nextOne() {Random random = new Random();int type = random.nextInt(20); // [0,20)if (type == 0) {return new Bee();} else {return new Airplane();}}}

游戏到这里就结束了这里有几张图片游戏中用到的图片，大家也可以自己找些自己喜欢的图片去用
hero1.png
hero0.png
start.png
gameover.png
pause.png
bee.png
airplane.png