坦克大战（一期）-设计模式-把GameModel做成单例（饿汉式）

src/main/java/com/msb/TankFrame.java

@@ -18,7 +18,6 @@ import java.util.Objects;
  */
 public class TankFrame extends Frame {
 
-    GameModel gameModel = new GameModel();
     public static final int GAME_WIDTH = 1400;
     public static final int GAME_HEIGHT = 1050;
 
@@ -46,7 +45,7 @@ public class TankFrame extends Frame {
     @Override
     public void paint(Graphics g) {
 //        super.paint(g);
-        gameModel.paint(g);
+        GameModel.getInstance().paint(g);
     }
 
     //双缓冲，解决闪烁现象
@@ -95,7 +94,7 @@ public class TankFrame extends Frame {
                 case KeyEvent.VK_RIGHT : bR = false; break;
                 case KeyEvent.VK_UP : bU = false; break;
                 case KeyEvent.VK_DOWN : bD = false; break;
-                case KeyEvent.VK_SPACE: gameModel.getMainTank().fire(); break;
+                case KeyEvent.VK_SPACE: GameModel.getInstance().getMainTank().fire(); break;
                 default: break;
             }
             setDir();
@@ -104,16 +103,16 @@ public class TankFrame extends Frame {
         private void setDir() {
             //当没有任何方向键按下的时候，那么让坦克停止
             if( !bL && !bR && !bU && !bD ) {
-                gameModel.getMainTank().setMove(false);
+                GameModel.getInstance().getMainTank().setMove(false);
             } else {
-                gameModel.getMainTank().setMove(true);
+                GameModel.getInstance().getMainTank().setMove(true);
             }
 
             //为什么不用if-else 因为有可能是一起按两个方向键，那最后拿到哪个算哪个
-            if(bL) gameModel.getMainTank().setDir(DirEnum.LEFT);
+            if(bL) GameModel.getInstance().getMainTank().setDir(DirEnum.LEFT);
-            if(bR) gameModel.getMainTank().setDir(DirEnum.RIGHT);
+            if(bR) GameModel.getInstance().getMainTank().setDir(DirEnum.RIGHT);
-            if(bU) gameModel.getMainTank().setDir(DirEnum.UP);
+            if(bU) GameModel.getInstance().getMainTank().setDir(DirEnum.UP);
-            if(bD) gameModel.getMainTank().setDir(DirEnum.DOWN);
+            if(bD) GameModel.getInstance().getMainTank().setDir(DirEnum.DOWN);
         }
     }
 

src/main/java/com/msb/inter/impl/DefaultFireStrategy.java

@@ -21,6 +21,7 @@ public class DefaultFireStrategy implements FireStrategy {
     public void fire(Tank tank) {
         int bX = tank.getX() + Tank.WIDTH/2 - Bullet.WIDTH/2;
         int bY = tank.getY()+Tank.HEIGHT/2-Bullet.HEIGHT/2;
-        new Bullet(bX, bY, tank.getDir(), tank.getGroup(), tank.getGameModel());
+//        new Bullet(bX, bY, tank.getDir(), tank.getGroup(), tank.getGameModel());
+        new Bullet(bX, bY, tank.getDir(), tank.getGroup());
     }
 }

src/main/java/com/msb/inter/impl/FourFireStrategy.java

@@ -23,7 +23,8 @@ public class FourFireStrategy implements FireStrategy {
         int bX = tank.getX() + Tank.WIDTH/2 - Bullet.WIDTH/2;
         int bY = tank.getY()+Tank.HEIGHT/2-Bullet.HEIGHT/2;
         for (DirEnum value : DirEnum.values()) {
-            new Bullet(bX, bY, value, tank.getGroup(), tank.getGameModel());
+//            new Bullet(bX, bY, value, tank.getGroup(), tank.getGameModel());
+            new Bullet(bX, bY, value, tank.getGroup());
         }
     }
 }

src/main/java/com/msb/model/Bullet.java

@@ -24,28 +24,26 @@ public class Bullet extends GameObject {
     public static final int SPEED = 8;
     private boolean live = true;
     private GroupEnum group = GroupEnum.BAD;
-    private GameModel gameModel;
     private Rectangle rectangle = new Rectangle();
 
-    public Bullet(int x, int y, DirEnum dir, GroupEnum group, GameModel gameModel) {
+    public Bullet(int x, int y, DirEnum dir, GroupEnum group) {
         this.x = x;
         this.y = y;
         this.dir = dir;
         this.group = group;
-        this.gameModel = gameModel;
 
         rectangle.x = this.x;
         rectangle.x = this.y;
         rectangle.width = WIDTH;
         rectangle.height = HEIGHT;
 
-        gameModel.gameObjects.add(this);
+        GameModel.getInstance().add(this);
     }
 
     @Override
     public void paint(Graphics g) {
         if( ! this.live)  {
-            gameModel.gameObjects.remove(this);
+            GameModel.getInstance().remove(this);
             return;
         }
 

src/main/java/com/msb/model/Explode.java

@@ -16,16 +16,14 @@ import java.awt.*;
 public class Explode extends GameObject {
 
 //    private int x,y;
-    private GameModel gameModel;
     public static final int WIDTH = ResourcesMgr.explodeImages[0].getWidth();
     public static final int HEIGHT = ResourcesMgr.explodeImages[0].getHeight();
 //    private boolean live = true;
     private int step = 0;
 
-    public Explode(int x, int y, GameModel gameModel) {
+    public Explode(int x, int y) {
         this.x = x;
         this.y = y;
-        this.gameModel = gameModel;
     }
 
     @Override
@@ -35,7 +33,7 @@ public class Explode extends GameObject {
         if(step >= ResourcesMgr.explodeImages.length) {
             step = 0;
 //            gameModel.explodes.remove(this);
-            gameModel.gameObjects.remove(this);
+            GameModel.getInstance().remove(this);
         }
 
     }

src/main/java/com/msb/model/GameModel.java

@@ -30,7 +30,9 @@ import java.util.List;
  */
 public class GameModel {
 
-    Tank myTank = new Tank(100, 500, DirEnum.RIGHT, GroupEnum.GOOD, this);
+    public static final GameModel INSTANCE = new GameModel();
+
+    Tank myTank = new Tank(100, 500, DirEnum.RIGHT, GroupEnum.GOOD);
     /*
     public List<Bullet> bullets = new ArrayList<>();
     public List<Tank> tanks = new ArrayList<>();   //敌方坦克
@@ -40,12 +42,22 @@ public class GameModel {
     private ColliderChain colliderChain = new ColliderChain();
 //    public GameFactory gameFactory = new DefaultFactory();
 
-    public GameModel() {
+    static {
+        INSTANCE.init();
+    }
+
+    private GameModel() {};
+
+    public static GameModel getInstance() {
+        return INSTANCE;
+    }
+
+    public void init() {
         int initTankCount = Integer.parseInt(PropertyMgr.getString("initTankCount"));
         //创建5个敌方坦克
         for (int i=0; i<initTankCount; i++) {
 //            tankFrame.tanks.add(new Tank(100 + i*80, 100, DirEnum.valueOf(random.nextInt(30)%4), GroupEnum.BAD, tankFrame));
-            this.gameObjects.add(new Tank(100 + i*120, 100, DirEnum.DOWN, GroupEnum.BAD, this));
+            gameObjects.add(new Tank(100 + i*120, 100, DirEnum.DOWN, GroupEnum.BAD));
         }
     }
 
@@ -98,4 +110,12 @@ public class GameModel {
     public Tank getMainTank() {
         return myTank;
     }
+
+    public void add(GameObject gameObject) {
+        gameObjects.add(gameObject);
+    }
+
+    public void remove(GameObject gameObject) {
+        gameObjects.remove(gameObject);
+    }
 }

src/main/java/com/msb/model/Tank.java

@@ -23,8 +23,6 @@ public class Tank extends GameObject {
     private DirEnum dir;
     private static final int SPEED = 4;
     private boolean move = true;
-    //为了解决能够在坦克中发射子弹，将创建的子弹通过坦克发射出来，那么需要在坦克类中持有游戏窗口的引用
-    private GameModel gameModel;
     public static final int WIDTH = ResourcesMgr.goodTankU.getWidth();
     public static final int HEIGHT = ResourcesMgr.goodTankU.getHeight();
     private boolean live = true;
@@ -35,12 +33,11 @@ public class Tank extends GameObject {
 
     private int oldX, oldY;
 
-    public Tank(int x, int y, DirEnum dir, GroupEnum group, GameModel gameModel) {
+    public Tank(int x, int y, DirEnum dir, GroupEnum group) {
         this.x = x;
         this.y = y;
         this.dir = dir;
         this.group = group;
-        this.gameModel = gameModel;
 
         rectangle.x = this.x;
         rectangle.x = this.y;
@@ -66,7 +63,7 @@ public class Tank extends GameObject {
     public void paint(Graphics g) {
 
         if( ! live)  {
-            gameModel.gameObjects.remove(this);
+            GameModel.getInstance().remove(this);
             return;
         }
 
@@ -150,7 +147,7 @@ public class Tank extends GameObject {
         this.live = false;
         int eX = this.x + WIDTH/2 - Explode.WIDTH/2;
         int eY = this.y + HEIGHT/2 - Explode.HEIGHT/2;
-        gameModel.gameObjects.add(new Explode(eX, eY, gameModel));
+        GameModel.getInstance().add(new Explode(eX, eY));
 //        gameModel.explodes.add(gameModel.gameFactory.createExplode(eX, eY, gameModel));
     }
 
@@ -162,10 +159,6 @@ public class Tank extends GameObject {
         return rectangle;
     }
 
-    public GameModel getGameModel() {
-        return gameModel;
-    }
-
     public int getOldX() {
         return oldX;
     }

src/main/java/com/msb/model/Wall.java

@@ -0,0 +1,48 @@
+package com.msb.model;/**
+ * @Author bingor
+ * @Date 2022/10/12 14:50
+ * @Description: com.msb.model
+ * @Version: 1.0
+ */
+
+import com.msb.model.abstracts.GameObject;
+
+import java.awt.*;
+
+/**
+ *@ClassName Wall
+ *@Description TODO
+ *@Author bingor
+ *@Date 2022/10/12 14:50
+ *@Version 3.0
+ */
+public class Wall extends GameObject {
+
+    private int width, height;
+    private Rectangle rectangle;
+
+    public Wall(int x, int y, int width, int height) {
+        this.x = x;
+        this.y = y;
+        this.width = width;
+        this.height = height;
+        this.rectangle = new Rectangle(x, y, width, height);
+    }
+
+    @Override
+    public void paint(Graphics g) {
+        GameModel.getInstance().paint(g);
+    }
+
+    public int getWidth() {
+        return width;
+    }
+
+    public int getHeight() {
+        return height;
+    }
+
+    public Rectangle getRectangle() {
+        return rectangle;
+    }
+}

src/test/java/CommonTest.java

@@ -33,4 +33,19 @@ public class CommonTest {
         System.out.println(DirEnum.valueOf(random.nextInt(3)));
     }
 
+    @Test
+    public void testCommon() {
+       boolean bool = xh();
+        System.out.println(bool);
+    }
+
+    public boolean xh() {
+        int [] indexs = {1, 2, 3, 4, 5, 6, 7, 8, 9 };
+        for (int index : indexs) {
+            if(index == 5) return false;
+            System.out.println(index);
+        }
+        return true;
+    }
+
 }