代码格式

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

@@ -31,6 +31,7 @@ public class Tank {
 
 
     public Tank(int x, int y, Dir dir, TankFrame tf) {
+        super();
         this.x = x;
         this.y = y;
         this.dir = dir;

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

@@ -24,7 +24,7 @@ public class TankFrame extends Frame {
         setResizable(false);
         setTitle("tank battle");
         setVisible(true);
-        addKeyListener(new MyKeyListener());
+        this.addKeyListener(new MyKeyListener());
         addWindowListener(new WindowAdapter() {
             @Override
             public void windowClosing(WindowEvent e) {
@@ -37,7 +37,7 @@ public class TankFrame extends Frame {
     @Override
     public void update(Graphics g) {
         if (offScreenImage == null) {
-            offScreenImage = createImage(GAME_WIDTH, GAME_HEIGHT);
+            offScreenImage = this.createImage(GAME_WIDTH, GAME_HEIGHT);
         }
         Graphics gOffScreen = offScreenImage.getGraphics();
         Color c = gOffScreen.getColor();
@@ -58,12 +58,13 @@ public class TankFrame extends Frame {
     }
 
 
-    public class MyKeyListener extends KeyAdapter {
+    class MyKeyListener extends KeyAdapter {
 
         boolean bL = false;
         boolean bU = false;
         boolean bR = false;
         boolean bD = false;
+
         @Override
         public void keyPressed(KeyEvent e) {
             int key = e.getKeyCode();
@@ -89,7 +90,6 @@ public class TankFrame extends Frame {
 
         @Override
         public void keyReleased(KeyEvent e) {
-            System.out.println("key released");
             int key = e.getKeyCode();
             switch (key) {
                 case KeyEvent.VK_LEFT: