碰撞检测，敌方坦克被击中后消失

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

@@ -1,6 +1,6 @@
 package com.example.tankbattle;
 
-import java.awt.Graphics;
+import java.awt.*;
 
 public class Bullet {
     private static final int SPEED = 10;
@@ -9,7 +9,7 @@ public class Bullet {
     private int x, y;
     private Dir dir;
 
-    private boolean live = true;
+    private boolean living = true;
 
     private TankFrame tf;
 
@@ -21,7 +21,7 @@ public class Bullet {
     }
 
     public void paint(Graphics g) {
-        if (!live) {
+        if (!living) {
             tf.bullets.remove(this);
         }
         switch (dir) {
@@ -45,6 +45,7 @@ public class Bullet {
     }
 
     private void move() {
+        if (!living) return;
         switch (dir) {
             case LEFT:
                 x -= SPEED;
@@ -63,6 +64,19 @@ public class Bullet {
                 break;
         }
 
-        if (x < 0 || y < 0 || x > TankFrame.GAME_WIDTH || y > TankFrame.GAME_HEIGHT) live = false;
+        if (x < 0 || y < 0 || x > TankFrame.GAME_WIDTH || y > TankFrame.GAME_HEIGHT) living = false;
+    }
+
+    public void collideWith(Tank tank){
+        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)) {
+            tank.die();
+            this.die();
+        }
+    }
+
+    private void die() {
+        this.living = false;
     }
 }

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

@@ -4,6 +4,23 @@ import java.awt.Graphics;
 
 public class Tank {
     private int x,y;
+
+    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;
+    }
+
     private Dir dir = Dir.DOWN;
     private static final int SPEED = 5;
 
@@ -14,6 +31,8 @@ public class Tank {
 
     private TankFrame tf = null;
 
+    private boolean living = true;
+
     public boolean isMoving() {
         return moving;
     }
@@ -41,6 +60,7 @@ public class Tank {
     }
 
     public void paint(Graphics g) {
+        if (!living) tf.tanks.remove(this);
         switch (dir) {
             case LEFT:
                 g.drawImage(ResourceMgr.tankL, x, y, null);
@@ -85,4 +105,8 @@ public class Tank {
         int bY = this.y + Tank.HEIGHT / 2 - Bullet.HEIGHT / 2;
         tf.bullets.add(new Bullet(bX, bY, this.dir, this.tf));
     }
+
+    public void die() {
+        this.living = false;
+    }
 }

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

@@ -53,6 +53,7 @@ public class TankFrame extends Frame {
         Color c = g.getColor();
         g.setColor(Color.WHITE);
         g.drawString("子弹的数量:" + bullets.size(), 10, 60);
+        g.drawString("敌方坦克的数量:" + tanks.size(), 10, 60);
         g.setColor(c);
 
         myTank.paint(g);
@@ -63,6 +64,12 @@ public class TankFrame extends Frame {
         for (int i = 0; i < tanks.size(); i++) {
             tanks.get(i).paint(g);
         }
+
+        for (int i = 0; i < bullets.size(); i++) {
+            for (int j = 0; j < tanks.size(); j++) {
+                bullets.get(i).collideWith(tanks.get(j));
+            }
+        }
 //        for (Iterator<Bullet> it = bullets.iterator(); it.hasNext()) {
 //            Bullet b = it.next();
 //            if (!b.live) it.remove();