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：