二、设计飞机类，实现键盘移动（雷霆战机）

GitHub地址：https://github.com/WingedCat/AirWar

用枚举类型标记方向：

public enum Direction {
    L, R, RD, D, LD, STOP,LU, U, RU
}

完成飞机图片的载入，添加按键按下和释放的方法，添加移动方法：

package cn.xpu.hcp.entity;

import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.KeyEvent;
import java.util.Random;

import cn.xpu.hcp.game.GameFrame;
import cn.xpu.hcp.tools.Constant;
import cn.xpu.hcp.tools.GameImage;

public class Plane {
    private static Random r = new Random(); 
    int randIndex;
    private int x,y;//飞机的位置
    private boolean good;//飞机是我还是对方（敌机）；我设置为true，敌机设置为false
    private boolean isAlive = true;//表明飞机是否活着
    private boolean isBoss;//用于敌方飞机是否是boss机型
    private int blood;//表明飞机血量
    private GameFrame gf;
    private int speed;//飞机移动速度
    private boolean bL,bU,bR,bD;
    private Direction dir = Direction.STOP;//Plane的移动状态,初始化时默认是STOP  
    private static Image[] myImgs=new Image[28];//存放我方机型图片的数组
    private static Image[] enemyImgs = new Image[23];//存放敌方普通机型的图片
    private static Image[] bossImgs = new Image[8];//存放敌方boss机型的图片
    private Image ensureImg;//具体确定的图片

    static{
        //我方飞机机型图片
        myImgs[0]=GameImage.getImage("resources/plane1.png");  
        myImgs[1]= GameImage.getImage("resources/plane2.png");  
        myImgs[2]= GameImage.getImage("resources/plane3.png");  
        myImgs[3]= GameImage.getImage("resources/plane4.png");  
        myImgs[4]= GameImage.getImage("resources/plane5.png");  
        myImgs[5]= GameImage.getImage("resources/plane6.png");  
        myImgs[6]= GameImage.getImage("resources/plane7.png");  
        myImgs[7]= GameImage.getImage("resources/plane8.png");  

        myImgs[8]= GameImage.getImage("resources/plane9.png");  
        myImgs[9]= GameImage.getImage("resources/plane10.png");  
        myImgs[10]= GameImage.getImage("resources/plane11.png");  
        myImgs[11]= GameImage.getImage("resources/plane12.png");  
        myImgs[12]= GameImage.getImage("resources/plane13.png");  
        myImgs[13]= GameImage.getImage("resources/plane14.png");  
        myImgs[14]= GameImage.getImage("resources/plane15.png");  
        myImgs[15]= GameImage.getImage("resources/plane16.png");

        myImgs[16]= GameImage.getImage("resources/plane17.png");  
        myImgs[17]= GameImage.getImage("resources/plane18.png");  
        myImgs[18]= GameImage.getImage("resources/plane19.png");  
        myImgs[19]= GameImage.getImage("resources/plane20.png");  
        myImgs[20]= GameImage.getImage("resources/plane21.png");  
        myImgs[21]= GameImage.getImage("resources/plane22.png");  
        myImgs[22]= GameImage.getImage("resources/plane23.png");  
        myImgs[23]= GameImage.getImage("resources/plane24.png");

        myImgs[24]= GameImage.getImage("resources/plane25.png");  
        myImgs[25]= GameImage.getImage("resources/plane26.png");  
        myImgs[26]= GameImage.getImage("resources/plane27.png");  
        myImgs[27]= GameImage.getImage("resources/plane28.png");  

        //敌方普通飞机机型图片
        enemyImgs[0]=GameImage.getImage("resources/enemy1.png");  
        enemyImgs[1]= GameImage.getImage("resources/enemy2.png");  
        enemyImgs[2]= GameImage.getImage("resources/enemy3.png");  
        enemyImgs[3]= GameImage.getImage("resources/enemy4.png");  
        enemyImgs[4]= GameImage.getImage("resources/enemy5.png");  
        enemyImgs[5]= GameImage.getImage("resources/enemy6.png");  
        enemyImgs[6]= GameImage.getImage("resources/enemy7.png");  
        enemyImgs[7]= GameImage.getImage("resources/enemy8.png");  

        enemyImgs[8]= GameImage.getImage("resources/enemy9.png");  
        enemyImgs[9]= GameImage.getImage("resources/enemy10.png");  
        enemyImgs[10]= GameImage.getImage("resources/enemy11.png");  
        enemyImgs[11]= GameImage.getImage("resources/enemy12.png");  
        enemyImgs[12]= GameImage.getImage("resources/enemy13.png");  
        enemyImgs[13]= GameImage.getImage("resources/enemy14.png");  
        enemyImgs[14]= GameImage.getImage("resources/enemy15.png");  
        enemyImgs[15]= GameImage.getImage("resources/enemy16.png");

        enemyImgs[16]= GameImage.getImage("resources/enemy17.png");  
        enemyImgs[17]= GameImage.getImage("resources/enemy18.png");  
        enemyImgs[18]= GameImage.getImage("resources/enemy19.png");  
        enemyImgs[19]= GameImage.getImage("resources/enemy20.png");  
        enemyImgs[20]= GameImage.getImage("resources/enemy21.png");  
        enemyImgs[21]= GameImage.getImage("resources/enemy22.png");  
        enemyImgs[22]= GameImage.getImage("resources/enemy23.png"); 

        //boss机型图片
        bossImgs[0]=GameImage.getImage("resources/boss1.png");  
        bossImgs[1]= GameImage.getImage("resources/boss2.png");  
        bossImgs[2]= GameImage.getImage("resources/boss3.png");  
        bossImgs[3]= GameImage.getImage("resources/boss4.png");  
        bossImgs[4]= GameImage.getImage("resources/boss5.png");  
        bossImgs[5]= GameImage.getImage("resources/boss6.png");  
        bossImgs[6]= GameImage.getImage("resources/boss7.png");  
        bossImgs[7]= GameImage.getImage("resources/boss8.png"); 
    }

    public Plane(int x,int y,int speed,boolean good,GameFrame gf){
        this.x = x;
        this.y = y;
        this.speed = speed;
        this.good = good;
        this.gf = gf;
        if(good==true){
            randIndex = r.nextInt(28);
            ensureImg = myImgs[randIndex];
        }else{
            if(isBoss){//如果是boss机型，在boss机型中选择
                randIndex = r.nextInt(8);
                ensureImg = bossImgs[randIndex];
            }else{
                randIndex = r.nextInt(23);
                ensureImg = enemyImgs[randIndex];
                dir = Direction.D;//普通敌机方向只有向下
            }
        }
    }
    public void draw(Graphics g){
        if(isAlive==false){//飞机死亡，不画
            return;
        }
        g.drawImage(ensureImg, x, y, null);
        move(); 
    }
    public void Press(KeyEvent e) {
        int key = e.getKeyCode();  
        switch(key) {  
        case KeyEvent.VK_LEFT :  
            bL = true;  
            break;  
        case KeyEvent.VK_UP :  
            bU = true;  
            break;  
        case KeyEvent.VK_RIGHT :  
            bR = true;  
            break;  
        case KeyEvent.VK_DOWN :  
            bD = true;  
            break;  
        } 
        locateDirection();
    }
    public void Release(KeyEvent e) {
        int key = e.getKeyCode();  
        switch(key) {  
        case KeyEvent.VK_SPACE:  
        case KeyEvent.VK_CONTROL:  
//          fire();预留开火
            break;  
        case KeyEvent.VK_LEFT :  
            bL = false;  
            break;  
        case KeyEvent.VK_UP :  
            bU = false;  
            break;  
        case KeyEvent.VK_RIGHT :  
            bR = false;  
            break;  
        case KeyEvent.VK_DOWN :  
            bD = false;  
            break;  
        }
        locateDirection();
    }

    void locateDirection() {//根据按键设置Plane移动方向-->dir  
        if(bL && !bU && !bR && !bD) dir = Direction.L;  
        else if(bL && bU && !bR && !bD) dir = Direction.LU;  
        else if(!bL && bU && !bR && !bD) dir = Direction.U;  
        else if(!bL && bU && bR && !bD) dir = Direction.RU;  
        else if(!bL && !bU && bR && !bD) dir = Direction.R;  
        else if(!bL && !bU && bR && bD) dir = Direction.RD;  
        else if(!bL && !bU && !bR && bD) dir = Direction.D;  
        else if(bL && !bU && !bR && bD) dir = Direction.LD;  
        else if(!bL && !bU && !bR && !bD) dir = Direction.STOP;  
    } 

    //Plane的移动方法  
    void move() {  
        switch(dir) {  
        case L:  
            x -= speed;  
            break;  
        case LU:  
            x -= speed;  
            y -= speed;  
            break;  
        case U:  
            y -= speed;  
            break;  
        case RU:  
            x += speed;  
            y -= speed;  
            break;  
        case R:  
            x += speed;  
            break;  
        case RD:  
            x += speed;  
            y += speed;  
            break;  
        case D:  
            y += speed;  
            break;  
        case LD:  
            x -= speed;  
            y += speed;  
            break;  
        case STOP:  
            break;  
        }  
        //到达窗体边界，不允许继续移动  
        if(x < 0) x = 0;  
        if(y < 30) y = 30;  
        if(x + ensureImg.getWidth(null) > Constant.GAME_WIDTH) x = Constant.GAME_WIDTH - ensureImg.getWidth(null);  
        if(y + ensureImg.getHeight(null) > Constant.GAME_HEIGHT) y = Constant.GAME_HEIGHT - ensureImg.getHeight(null);  
    } 
}

测试结果：