抽象出坦克类，封装相应的属性和方法

src/com/msb/Tank.java

@@ -0,0 +1,38 @@
+package com.msb;
+
+import java.awt.*;
+
+/**
+ * @Author bingor
+ * @Date 2022-09-29 21:53
+ * @Description: com.msb
+ * @Version: 1.0
+ */
+public class Tank {
+
+    private int x,y;
+    private DirEnum dir;
+    private static final int SPEED = 10;
+
+    public Tank(int x, int y, DirEnum dir) {
+        this.x = x;
+        this.y = y;
+        this.dir = dir;
+    }
+
+    public void paint(Graphics g) {
+        g.fillRect(x, y, 50, 50);
+
+        switch (dir) {
+            case UP: y -= SPEED; break;
+            case DOWN: y += SPEED; break;
+            case LEFT: x -= SPEED; break;
+            case RIGHT: x += SPEED; break;
+            default: break;
+        }
+    }
+
+    public void setDir(DirEnum dir) {
+        this.dir = dir;
+    }
+}

src/com/msb/TankFrame.java

@@ -14,10 +14,7 @@ import java.awt.event.WindowEvent;
  */
 public class TankFrame extends Frame {
 
-    private int x = 200;
-    private int y = 200;
-    private DirEnum dir = DirEnum.RIGHT;
-    private static final int SPEED = 10;
+    Tank tank = new Tank(200, 200, DirEnum.RIGHT);
 
     public TankFrame() {
 
@@ -41,15 +38,7 @@ public class TankFrame extends Frame {
     @Override
     public void paint(Graphics g) {
         super.paint(g);
-        g.fillRect(x, y, 50, 50);
-
-        switch (dir) {
-            case UP: y -= SPEED; break;
-            case DOWN: y += SPEED; break;
-            case LEFT: x -= SPEED; break;
-            case RIGHT: x += SPEED; break;
-            default: break;
-        }
+        tank.paint(g);
     }
 
     //这里使用内部内的原因是，只有TankFrame用到
@@ -88,10 +77,10 @@ public class TankFrame extends Frame {
 
         private void setDir() {
             //为什么不用if-else 因为有可能是一起按两个方向键，那最后拿到哪个算哪个
-            if(bL) dir = DirEnum.LEFT;
-            if(bR) dir = DirEnum.RIGHT;
-            if(bU) dir = DirEnum.UP;
-            if(bD) dir = DirEnum.DOWN;
+            if(bL) tank.setDir(DirEnum.LEFT);
+            if(bR) tank.setDir(DirEnum.RIGHT);
+            if(bU) tank.setDir(DirEnum.UP);
+            if(bD) tank.setDir(DirEnum.DOWN);
         }
     }