diff --git a/src/main/java/com/example/tankbattle/Main.java b/src/main/java/com/example/tankbattle/Main.java
index a060dda..61786e5 100644
--- a/src/main/java/com/example/tankbattle/Main.java
+++ b/src/main/java/com/example/tankbattle/Main.java
@@ -2,10 +2,10 @@ package com.example.tankbattle;
 
 public class Main {
     public static void main(String[] args) throws InterruptedException {
-        TankFrame tankFrame = new TankFrame();
+        TankFrame tf = new TankFrame();
         while (true) {
             Thread.sleep(50);
-            tankFrame.repaint();
+            tf.repaint();
         }
     }
 }
diff --git a/src/main/java/com/example/tankbattle/Tank.java b/src/main/java/com/example/tankbattle/Tank.java
index 6763846..d99d4cc 100644
--- a/src/main/java/com/example/tankbattle/Tank.java
+++ b/src/main/java/com/example/tankbattle/Tank.java
@@ -6,7 +6,7 @@ import java.awt.Graphics;
 public class Tank {
     private int x,y;
     private Dir dir = Dir.DOWN;
-    public static final int SPEED = 5;
+    private static final int SPEED = 5;
 
     private boolean moving = false;
 
@@ -46,9 +46,7 @@ public class Tank {
     }
 
     private void move() {
-        if (!moving) {
-            return;
-        }
+        if (!moving) return;
         switch (dir) {
             case LEFT:
                 x -= SPEED;
diff --git a/src/main/java/com/example/tankbattle/TankFrame.java b/src/main/java/com/example/tankbattle/TankFrame.java
index c014cb2..cf2c304 100644
--- a/src/main/java/com/example/tankbattle/TankFrame.java
+++ b/src/main/java/com/example/tankbattle/TankFrame.java
@@ -1,6 +1,9 @@
 package com.example.tankbattle;
 
-import java.awt.*;
+import java.awt.Color;
+import java.awt.Frame;
+import java.awt.Graphics;
+import java.awt.Image;
 import java.awt.event.KeyAdapter;
 import java.awt.event.KeyEvent;
 import java.awt.event.WindowAdapter;