diff --git a/src/main/java/com/example/tankbattle/Bullet.java b/src/main/java/com/example/tankbattle/Bullet.java
index 7d155c5..35b3d38 100644
--- a/src/main/java/com/example/tankbattle/Bullet.java
+++ b/src/main/java/com/example/tankbattle/Bullet.java
@@ -1,12 +1,11 @@
 package com.example.tankbattle;
 
-import java.awt.Color;
 import java.awt.Graphics;
 
 public class Bullet {
-    private static final int SPEED = 1;
-    public static final int WIDTH = ResourceMgr.bulletD.getWidth();
-    public static final int HEIGHT = ResourceMgr.bulletD.getHeight();
+    private static final int SPEED = 10;
+    public static int WIDTH = ResourceMgr.bulletD.getWidth();
+    public static int HEIGHT = ResourceMgr.bulletD.getHeight();
     private int x, y;
     private Dir dir;
 
diff --git a/src/main/java/com/example/tankbattle/Image.java b/src/main/java/com/example/tankbattle/Image.java
deleted file mode 100644
index d958c2a..0000000
--- a/src/main/java/com/example/tankbattle/Image.java
+++ /dev/null
@@ -1,7 +0,0 @@
-package com.example.tankbattle;
-
-public class Image {
-    public void test() {
-
-    }
-}
diff --git a/src/main/java/com/example/tankbattle/ResourceMgr.java b/src/main/java/com/example/tankbattle/ResourceMgr.java
index a527248..1d77a8f 100644
--- a/src/main/java/com/example/tankbattle/ResourceMgr.java
+++ b/src/main/java/com/example/tankbattle/ResourceMgr.java
@@ -1,8 +1,8 @@
 package com.example.tankbattle;
 
-import javax.imageio.ImageIO;
 import java.awt.image.BufferedImage;
 import java.io.IOException;
+import javax.imageio.ImageIO;
 
 public class ResourceMgr {
     public static BufferedImage tankL, tankU, tankR, tankD;
@@ -19,8 +19,8 @@ public class ResourceMgr {
             bulletU = ImageIO.read(ResourceMgr.class.getClassLoader().getResourceAsStream("images/bulletU.gif"));
             bulletR = ImageIO.read(ResourceMgr.class.getClassLoader().getResourceAsStream("images/bulletR.gif"));
             bulletD = ImageIO.read(ResourceMgr.class.getClassLoader().getResourceAsStream("images/bulletD.gif"));
-        } catch (IOException exception) {
-            exception.printStackTrace();
+        } catch (IOException e) {
+            e.printStackTrace();
         }
     }
 }
diff --git a/src/main/java/com/example/tankbattle/Tank.java b/src/main/java/com/example/tankbattle/Tank.java
index 07fb1fe..bb22918 100644
--- a/src/main/java/com/example/tankbattle/Tank.java
+++ b/src/main/java/com/example/tankbattle/Tank.java
@@ -1,6 +1,5 @@
 package com.example.tankbattle;
 
-import java.awt.Color;
 import java.awt.Graphics;
 
 public class Tank {
@@ -8,8 +7,8 @@ public class Tank {
     private Dir dir = Dir.DOWN;
     private static final int SPEED = 5;
 
-    private static final int WIDTH = ResourceMgr.tankD.getWidth();
-    private static final int HEIGHT = ResourceMgr.tankD.getHeight();
+    private static int WIDTH = ResourceMgr.tankD.getWidth();
+    private static int HEIGHT = ResourceMgr.tankD.getHeight();
 
     private boolean moving = false;
 
diff --git a/src/main/java/com/example/tankbattle/TankFrame.java b/src/main/java/com/example/tankbattle/TankFrame.java
index 378dc95..6726639 100644
--- a/src/main/java/com/example/tankbattle/TankFrame.java
+++ b/src/main/java/com/example/tankbattle/TankFrame.java
@@ -15,11 +15,11 @@ import java.util.List;
 public class TankFrame extends Frame {
 
     Tank myTank = new Tank(200, 200, Dir.DOWN, this);
-    public static final int GAME_WIDTH = 800,GAME_HEIGHT=600;
 
     List<Bullet> bullets = new ArrayList<>();
+	public static final int GAME_WIDTH = 800,GAME_HEIGHT=600;
 
-    public TankFrame() {
+	public TankFrame() {
         setSize(GAME_WIDTH, GAME_HEIGHT);
         setResizable(false);
         setTitle("tank battle");
@@ -52,7 +52,7 @@ public class TankFrame extends Frame {
     public void paint(Graphics g) {
         Color c = g.getColor();
         g.setColor(Color.WHITE);
-        g.drawString("子弹的数量" + bullets.size(), 10, 60);
+        g.drawString("子弹的数量:" + bullets.size(), 10, 60);
         g.setColor(c);
 
         myTank.paint(g);