diff --git a/src/com/msb/PropertyMgr.java b/src/com/msb/PropertyMgr.java
index 0570e0f..50e5351 100644
--- a/src/com/msb/PropertyMgr.java
+++ b/src/com/msb/PropertyMgr.java
@@ -26,6 +26,10 @@ public class PropertyMgr {
         return props.get(key);
     }
 
+    public static String getString(String key) {
+        return (String) get(key);
+    }
+
     public static void main(String[] args) {
         System.out.println(get("initTankCount"));
     }
diff --git a/src/com/msb/TankDemo.java b/src/com/msb/TankDemo.java
index e657abc..b9e0274 100644
--- a/src/com/msb/TankDemo.java
+++ b/src/com/msb/TankDemo.java
@@ -14,7 +14,7 @@ public class TankDemo {
          TankFrame tankFrame = new TankFrame();
         Random random = new Random();
 
-        int initTankCount = Integer.parseInt((String) PropertyMgr.get("initTankCount"));
+        int initTankCount = Integer.parseInt(PropertyMgr.getString("initTankCount"));
 
          //创建5个敌方坦克
         for (int i=0; i<initTankCount; i++) {