diff --git a/docs/坦克大战笔记.docx b/docs/坦克大战笔记.docx
index c958764..bd38f63 100644
Binary files a/docs/坦克大战笔记.docx and b/docs/坦克大战笔记.docx differ
diff --git a/src/com/demo/tank/course3/Bullet.java b/src/com/demo/tank/course3/Bullet.java
index 6f1f7d4..e3b46bf 100644
--- a/src/com/demo/tank/course3/Bullet.java
+++ b/src/com/demo/tank/course3/Bullet.java
@@ -57,6 +57,19 @@ public class Bullet {
         }
     }
 
+    //检测是否跟坦克碰撞
+    public void collideWith(Tank tank){
+        Rectangle bulletRect = new Rectangle(x, y, WIDTH, HEIGHT);
+        Rectangle tankRect = new Rectangle(tank.getX(), tank.getY(), Tank.WIDTH, Tank.HEIGHT);
+        if(bulletRect.intersects(tankRect)){
+            tank.die();
+            this.die();
+        }
+    }
+
+    private void die() {
+        this.live = false;
+    }
 
     public int getX() {
         return x;
diff --git a/src/com/demo/tank/course3/MainV3.java b/src/com/demo/tank/course3/MainV3.java
index d486bf9..ffd0a53 100644
--- a/src/com/demo/tank/course3/MainV3.java
+++ b/src/com/demo/tank/course3/MainV3.java
@@ -5,6 +5,10 @@ import java.io.IOException;
 public class MainV3 {
     public static void main(String[] args) throws InterruptedException, IOException {
         TankFrameV3 tf = new TankFrameV3();
+        for(int i = 0; i < 5; i++){
+            tf.enemyTanks.add(new Tank(50 + i*80, 200, Direction.DOWN, tf));
+        }
+
         while (true){
             Thread.sleep(50);
             tf.repaint();
diff --git a/src/com/demo/tank/course3/Tank.java b/src/com/demo/tank/course3/Tank.java
index 7ba28b3..cd30222 100644
--- a/src/com/demo/tank/course3/Tank.java
+++ b/src/com/demo/tank/course3/Tank.java
@@ -7,6 +7,7 @@ public class Tank {
     private Direction dir;
     private static final int SPEED = 10;
     private boolean moving;
+    private boolean living = true;
     private TankFrameV3 tankFrame;
     public static final int WIDTH = ResourceManager.tankD.getWidth();
     public static final int HEIGHT = ResourceManager.tankD.getHeight();
@@ -20,6 +21,7 @@ public class Tank {
     }
 
     public void paint(Graphics g) {
+        if(!living) tankFrame.enemyTanks.remove(this);
         //根据方向绘制坦克
         switch (dir){
             case UP:
@@ -55,6 +57,10 @@ public class Tank {
         }
     }
 
+    public void die(){
+        this.living = false;
+    }
+
     public int getX() {
         return x;
     }
@@ -87,6 +93,14 @@ public class Tank {
         this.moving = moving;
     }
 
+    public boolean isLiving() {
+        return living;
+    }
+
+    public void setLiving(boolean living) {
+        this.living = living;
+    }
+
     public void fire() {
         int bx = x + Tank.WIDTH/2 - Bullet.WIDTH/2;
         int by = y + Tank.HEIGHT/2 - Bullet.HEIGHT/2;
diff --git a/src/com/demo/tank/course3/TankFrameV3.java b/src/com/demo/tank/course3/TankFrameV3.java
index 62573ab..a994fea 100644
--- a/src/com/demo/tank/course3/TankFrameV3.java
+++ b/src/com/demo/tank/course3/TankFrameV3.java
@@ -16,10 +16,11 @@ public class TankFrameV3 extends Frame {
     Tank tank = new Tank(500, 500, Direction.UP, this);
 //    Bullet bullet = new Bullet(520, 440, Direction.UP);
     List<Bullet> bullets = new ArrayList();
+    List<Tank> enemyTanks = new ArrayList<>();
 
     public TankFrameV3(){
         setVisible(true);
-        setBounds(200, 200 , GAME_WIDTH, GAME_HEIGHT);
+        setBounds(500, 200 , GAME_WIDTH, GAME_HEIGHT);
         setResizable(false);
         setTitle("tank war");
         this.addKeyListener(new MyKeyListener());
@@ -51,12 +52,24 @@ public class TankFrameV3 extends Frame {
         Color color = g.getColor();
         g.setColor(Color.WHITE);
         g.drawString("当前子弹数量:" + bullets.size(), 60, 50);
+        g.drawString("当前敌人数量:" + enemyTanks.size(), 60, 80);
         g.setColor(color);
 
         tank.paint(g);
+
+        for(int i = 0; i< enemyTanks.size(); i++){
+            enemyTanks.get(i).paint(g);
+        }
+
         for (int i = 0; i< bullets.size(); i++){
             bullets.get(i).paint(g);
         }
+
+        for(int i = 0; i< bullets.size(); i++){
+            for(int j=0; j< enemyTanks.size(); j++){
+                bullets.get(i).collideWith(enemyTanks.get(j));
+            }
+        }
 //        for(Iterator<Bullet> it = bullets.iterator(); it.hasNext();){
 //            Bullet b = it.next();
 //            if(!b.isLive()){