《飞机大战》这款小游戏相信许多朋友早就已经玩过，但是作为小白，学习过程中就是要拿各种经典项目来练手，飞机大战就是老师拿来让我们练手的一个小项目。老师给我们提供了素材包，让我们自由发挥，刚开始真的是没什么头绪，不过这几天的确学习到一些东西，随着慢慢尝试，终于背景动了起来，飞机动了起来，子弹动了起来，可以消灭敌机了，到这也算实现了最底层的功能，这里把代码和我理解的注释写下来，算是对学习过程的记录，也希望可以帮到其他朋友。

一、建立模板类，创建敌机和子弹的模板

敌机模板类Dj.java代码：

package model;import java.awt.Graphics;
import java.awt.Image;import javax.swing.ImageIcon;public class Dj {int x,y;String icon;public Dj(String icon) { //参数为敌机图片路径this.icon=icon;x=(int)(Math.random()*360)+10; //随机生成x坐标y=-30;}//画敌机public void drawPlane(Graphics g) {Image plane=new ImageIcon(icon).getImage();g.drawImage(plane, x-15, y-15, null);}//x,y的get和set方法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;}}

子弹模板类Zd.java代码：

package model;import java.awt.Graphics;
import java.awt.Image;import javax.swing.ImageIcon;public class Zd {int x, y;//构造方法public Zd(int a, int b) { //参数为英雄机坐标this.x=a;this.y=b;}//画子弹public void drawZd(Graphics g) {Image zd=new ImageIcon("src/images/bullet_7.png").getImage();g.drawImage(zd, x-19, y-80, null);}//x,y的get和set方法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;}}

二、创建碰撞判断类Crash

碰撞判断类Crash.java代码：

package model;public class Crash {// 判断子弹和敌机碰撞public boolean Boom(Zd z, Dj d) {int zx, zy, dx, dy;boolean crash = false;//子弹坐标zx = z.getX();zy = z.getY();//敌机坐标dx = d.getX();dy = d.getY();if (dx < zx && zy - dy < 30 && dx + 30 > zx) {crash = true; //如果相撞返回真值}return crash;}//飞机相撞public boolean Boom2(Dj d, int x, int y) {int dx, dy;boolean crash = false;//敌机坐标dx = d.getX();dy = d.getY();//英雄机坐标x = x - 50;y = y - 80;//相撞条件if (dx > x+20 && y - dy < 20 && dx < x + 60) {crash = true; //如果相撞返回真值}return crash;}}

三、创建画布类GamePanel

在画布类中创建敌机和子弹模板对象，并在画布上画出来，在新线程循环中改变坐标重画使其移动，获取鼠标坐标画出英雄机，循环遍历子弹和敌机集合，调用Crash类中的方法判断是否相撞
画布类GamePanel.java代码：

package panel;import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.util.ArrayList;
import java.util.List;import javax.swing.ImageIcon;
import javax.swing.JPanel;import model.Crash;
import model.Dj;
import model.Zd;public class GamePanel extends JPanel implements MouseMotionListener, MouseListener {/*** */private static final long serialVersionUID = 1682690307762671162L;int bx, by, x, y, dx, dy, score = 0,count=0,state; //背景坐标bx,by,英雄机坐标x,y,敌机坐标dx,dy,分数score,计数器count,运行状态stateImage bg; //背景图boolean db = false; //敌机爆炸图片绘图开关List<Zd> zd = new ArrayList<Zd>(); //存储子弹对象List<Dj> dj = new ArrayList<Dj>(); //存储敌机对象//运行状态常量public static final int START=1;public static final int RUNNING=2;public static final int PAUSE=3;public static final int OVER=4;//构造方法public GamePanel() {state=START;bx = 0;by = -5350;bg = new ImageIcon("src/images/background_1.png").getImage();}//重写paint方法@Overridepublic void paint(Graphics g) {super.paint(g);if(state==RUNNING){String sc = "分数:" + String.valueOf(score);g.drawImage(bg, bx, by, null); //画出背景g.drawRoundRect(0, 0, 120, 30, 5, 5); //分数框g.setFont(new Font("TimesRoman", Font.BOLD, 24));g.setColor(Color.RED);g.drawString(sc, 2, 20); //画出分数Image hero = new ImageIcon("src/images/plane_2.png").getImage(); g.drawImage(hero, x - 50, y - 80, null);  //画出英雄机if (db) { //在敌机爆炸时画出爆炸图片Image boom = new ImageIcon("src/images/boom1.png").getImage();g.drawImage(boom, dx, dy, null);db = false;}for (int i = 0; i < zd.size(); i++) {zd.get(i).drawZd(g);  //画出所有子弹}for (int j = 0; j < dj.size(); j++) {dj.get(j).drawPlane(g); //画出所有敌机}}else if(state==START){ //开始界面Image start=new ImageIcon("src/images/start.png").getImage();g.drawImage(start, 0, 0, 400, 650, null);}else if(state==OVER){ //结束界面Image over=new ImageIcon("src/images/over.png").getImage();g.drawImage(over, 0, 0, 400, 650, null);}else if(state==PAUSE){ //暂停界面Image pause=new ImageIcon("src/images/pause.png").getImage();g.drawImage(pause, 0, 0, 400, 650, null);}}// 移动类public void Move() {new Thread() {@Overridepublic void run() {super.run();while (true) {if(state==RUNNING){// 背景移动count++;by += 2;if (by > 0) {by = -5350;bg = new ImageIcon("src/images/background_2.png").getImage();}// 创建子弹if (count % 3 == 0) {zd.add(new Zd(x, y));} for (int a = 0; a < zd.size(); a++) {zd.get(a).setY(zd.get(a).getY() - 30); //改变子弹坐标，使子弹移动if (zd.get(a).getY() < 0) { //判断子弹越界zd.remove(a);}}// 创建敌机if (count % 21 == 0) {dj.add(new Dj("src/images/e4.png"));}else if (count % 31 == 0) {dj.add(new Dj("src/images/e5.png"));}else if (count % 41 == 0) {dj.add(new Dj("src/images/e6.png"));}for (int b = 0; b < dj.size(); b++) {dj.get(b).setY(dj.get(b).getY() + 3); //改变敌机坐标，使敌机移动if (dj.get(b).getY() > 650) { //判断敌机越界state=OVER; //游戏结束}}// 子弹和敌机碰撞Crash crash = new Crash();for (int j = 0; j < zd.size(); j++) {Zd z = zd.get(j);for (int i = 0; i < dj.size(); i++) {Dj d = dj.get(i);if (crash.Boom(z, d)) { //调用Crash对象的Boom方法判断是否相撞score += 2; //分数加2dx = dj.get(i).getX(); //敌机坐标dy = dj.get(i).getY();db = true; //敌机爆炸dj.remove(i); //从集合中删除敌机zd.remove(j); //从集合中删除子弹break;}}}//判断飞机相撞for (int i = 0; i < dj.size(); i++) {Dj d = dj.get(i);if (crash.Boom2(d, x, y)) {dx = dj.get(i).getX();dy = dj.get(i).getY();db = true;state=OVER; //游戏结束}}}repaint(); //重画try {Thread.sleep(20); //线程休眠} catch (InterruptedException e) {e.printStackTrace();}}}}.start();}//鼠标点击事件@Overridepublic void mouseClicked(MouseEvent e) {if(state==START||state==PAUSE){state=RUNNING;}else if (state==RUNNING){state=PAUSE;;}else if(state==OVER){//重新开始后初始化参数值state=RUNNING;score=0;count=0;bx = 0;bg = new ImageIcon("src/images/background_1.png").getImage();by = -5350;zd = new ArrayList<Zd>();dj = new ArrayList<Dj>();}}@Overridepublic void mousePressed(MouseEvent e) {// TODO 自动生成的方法存根}@Overridepublic void mouseReleased(MouseEvent e) {// TODO 自动生成的方法存根}@Overridepublic void mouseEntered(MouseEvent e) {// TODO 自动生成的方法存根}@Overridepublic void mouseExited(MouseEvent e) {// TODO 自动生成的方法存根}@Overridepublic void mouseDragged(MouseEvent e) {// TODO 自动生成的方法存根}@Overridepublic void mouseMoved(MouseEvent e) {x = e.getX(); //动态获取鼠标的坐标值y = e.getY();}}

四、 创建游戏主线程和游戏窗口

窗口类Game.java代码:

package frame;import javax.swing.JFrame;import panel.GamePanel;public class Game {public static void main(String[] args) {JFrame j = new JFrame(); //创建窗口GamePanel g = new GamePanel(); //创建画布j.add(g); //添加画布j.setSize(400, 650);j.setTitle("PlaneWar"); //设置标题j.setLocationRelativeTo(null); //设置居中j.setDefaultCloseOperation(3); //默认关闭j.setVisible(true); //窗口可见性g.Move(); //调用Move方法j.addMouseListener(g); //添加监听器j.addMouseMotionListener(g);}}

到这里，一个太监版的飞机大战小游戏就完成了。你有你的王者荣耀，我有我的飞机大战，不是很炫，但是很六。