子弹和坦克各自维护Rectangle

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

@@ -7,6 +7,9 @@ public class Bullet {
     private static final int SPEED = 6;
     public static int WIDTH = ResourceMgr.bulletD.getWidth();
     public static int HEIGHT = ResourceMgr.bulletD.getHeight();
+
+    private Rectangle rect = new Rectangle();
+
     private int x, y;
     private Dir dir;
 
@@ -20,6 +23,11 @@ public class Bullet {
         this.dir = dir;
         this.group = group;
         this.tf = tf;
+
+        rect.x = this.x;
+        rect.y = this.y;
+        rect.width = WIDTH;
+        rect.height = HEIGHT;
     }
 
     public Group getGroup() {
@@ -73,14 +81,15 @@ public class Bullet {
                 break;
         }
 
+        rect.x = this.x;
+        rect.y = this.y;
+
         if (x < 0 || y < 0 || x > TankFrame.GAME_WIDTH || y > TankFrame.GAME_HEIGHT) living = false;
     }
 
     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)) {
+        if (this.rect.intersects(tank.rect)) {
             tank.die();
             this.die();
             int eX = tank.getX() + Tank.WIDTH / 2 - Explode.WIDTH / 2;

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

@@ -1,6 +1,6 @@
 package com.example.tankbattle;
 
-import java.awt.Graphics;
+import java.awt.*;
 import java.util.Random;
 
 public class Tank {
@@ -9,6 +9,8 @@ public class Tank {
     public static int WIDTH = ResourceMgr.GoodTankD.getWidth();
     public static int HEIGHT = ResourceMgr.GoodTankD.getHeight();
 
+    Rectangle rect = new Rectangle();
+
     private Random random = new Random();
 
     private int x,y;
@@ -30,6 +32,11 @@ public class Tank {
         this.dir = dir;
         this.group = group;
         this.tf = tf;
+
+        rect.x = this.x;
+        rect.y = this.y;
+        rect.width = WIDTH;
+        rect.height = HEIGHT;
     }
 
     public void fire(){
@@ -81,6 +88,8 @@ public class Tank {
                 break;
         }
 
+        rect.x = this.x;
+        rect.y = this.y;
         if (this.group == Group.BAD && random.nextInt(100) > 95) this.fire();
 
         if (this.group == Group.BAD && random.nextInt(100) > 95) {