diff --git a/src/com/msb/TankFrame.java b/src/com/msb/TankFrame.java
index 588e466..5ccbb4e 100644
--- a/src/com/msb/TankFrame.java
+++ b/src/com/msb/TankFrame.java
@@ -45,16 +45,60 @@ public class TankFrame extends Frame {
 
     //这里使用内部内的原因是，只有TankFrame用到
     class MyKeyListener extends KeyAdapter {
+
+        private boolean bL = false;
+        private boolean bR = false;
+        private boolean bU = false;
+        private boolean bD = false;
+
         @Override
         public void keyPressed(KeyEvent e) {
             super.keyPressed(e);
             /*x += 10;
             repaint();*/
+            switch (e.getKeyCode()) {
+                case KeyEvent.VK_LEFT : {
+                    bL = true;
+                    break;
+                }
+                case KeyEvent.VK_RIGHT : {
+                    bR = true;
+                    break;
+                }
+                case KeyEvent.VK_UP : {
+                    bU = true;
+                    break;
+                }
+                case KeyEvent.VK_DOWN : {
+                    bD = true;
+                    break;
+                }
+                default: break;
+            }
         }
 
         @Override
         public void keyReleased(KeyEvent e) {
             super.keyReleased(e);
+            switch (e.getKeyCode()) {
+                case KeyEvent.VK_LEFT : {
+                    bL = false;
+                    break;
+                }
+                case KeyEvent.VK_RIGHT : {
+                    bR = false;
+                    break;
+                }
+                case KeyEvent.VK_UP : {
+                    bU = false;
+                    break;
+                }
+                case KeyEvent.VK_DOWN : {
+                    bD = false;
+                    break;
+                }
+                default: break;
+            }
         }
     }