坦克和子弹分组

src/main/java/com/example/tankbattle/Bullet.java

@@ -13,11 +13,14 @@ public class Bullet {
 
     private TankFrame tf;
 
-    public Bullet(int x, int y, Dir dir, TankFrame tf) {
+    private Group group = Group.BAD;
+
+    public Bullet(int x, int y, Dir dir, Group group, TankFrame tf) {
         this.x = x;
         this.y = y;
         this.dir = dir;
         this.tf = tf;
+        this.group = group;
     }
 
     public void paint(Graphics g) {
@@ -68,6 +71,7 @@ public class Bullet {
     }
 
     public void collideWith(Tank tank){
+        if (this.group == tank.getGroup()) return;
         Rectangle rect1 = new Rectangle(this.x, this.y, WIDTH, HEIGHT);
         Rectangle rect2 = new Rectangle(tank.getX(), tank.getY(), Tank.WIDTH, Tank.HEIGHT);
         if (rect1.intersects(rect2)) {

src/main/java/com/example/tankbattle/Group.java

@@ -0,0 +1,5 @@
+package com.example.tankbattle;
+
+public enum Group {
+    GOOD, BAD
+}

src/main/java/com/example/tankbattle/Main.java

@@ -6,7 +6,7 @@ public class Main {
 
         // 初始化敌方坦克
         for (int i = 0; i < 5; i++) {
-            tf.tanks.add(new Tank(50 + i * 80, 200, Dir.DOWN, tf));
+            tf.tanks.add(new Tank(50 + i * 80, 200, Dir.DOWN, Group.BAD, tf));
         }
 
         while (true) {

src/main/java/com/example/tankbattle/Tank.java

@@ -1,10 +1,28 @@
 package com.example.tankbattle;
 
 import java.awt.Graphics;
+import java.util.Random;
 
 public class Tank {
+    private static final int SPEED = 5;
+
+    public static int WIDTH = ResourceMgr.tankD.getWidth();
+    public static int HEIGHT = ResourceMgr.tankD.getHeight();
+
+    private Random random = new Random();
+
     private int x,y;
 
+    private Dir dir = Dir.DOWN;
+
+    private boolean moving = false;
+
+    private TankFrame tf = null;
+
+    private boolean living = true;
+
+    private Group group = Group.BAD;
+
     public int getX() {
         return x;
     }
@@ -21,17 +39,13 @@ public class Tank {
         this.y = y;
     }
 
-    private Dir dir = Dir.DOWN;
-    private static final int SPEED = 5;
-
-    public static int WIDTH = ResourceMgr.tankD.getWidth();
-    public static int HEIGHT = ResourceMgr.tankD.getHeight();
-
-    private boolean moving = false;
-
-    private TankFrame tf = null;
+    public Group getGroup() {
+        return group;
+    }
 
-    private boolean living = true;
+    public void setGroup(Group group) {
+        this.group = group;
+    }
 
     public boolean isMoving() {
         return moving;
@@ -50,13 +64,13 @@ public class Tank {
     }
 
 
-
-    public Tank(int x, int y, Dir dir, TankFrame tf) {
+    public Tank(int x, int y, Dir dir, Group group, TankFrame tf) {
         super();
         this.x = x;
         this.y = y;
         this.dir = dir;
         this.tf = tf;
+        this.group = group;
     }
 
     public void paint(Graphics g) {
@@ -98,12 +112,14 @@ public class Tank {
             default:
                 break;
         }
+
+        if (random.nextInt(10) > 5) this.fire();
     }
 
     public void fire(){
         int bX = this.x + Tank.WIDTH / 2 - Bullet.WIDTH / 2;
         int bY = this.y + Tank.HEIGHT / 2 - Bullet.HEIGHT / 2;
-        tf.bullets.add(new Bullet(bX, bY, this.dir, this.tf));
+        tf.bullets.add(new Bullet(bX, bY, this.dir, this.group, this.tf));
     }
 
     public void die() {

src/main/java/com/example/tankbattle/TankFrame.java

@@ -13,7 +13,7 @@ import java.util.List;
 
 public class TankFrame extends Frame {
 
-    Tank myTank = new Tank(200, 400, Dir.DOWN, this);
+    Tank myTank = new Tank(200, 400, Dir.DOWN, Group.GOOD, this);
 
     List<Tank> tanks = new ArrayList<>();
     List<Bullet> bullets = new ArrayList<>();