add synchronized singleton

dynamicy · dynamicy · commit e3598d62bad2 · 2014-11-12T00:37:14.000+08:00
diff --git a/SingletonPattern/Java/SynchronizedSingleton.java b/SingletonPattern/Java/SynchronizedSingleton.java
@@ -0,0 +1,17 @@
+public class SynchronizedSingleton 
+{
+    private static SynchronizedSingleton instance = null;
+    
+    private SynchronizedSingleton()
+    {
+    }
+    
+    synchronized static public SynchronizedSingleton getInstance() 
+    {
+        if (instance == null) 
+        {
+            instance = new SynchronizedSingleton();
+        }
+        return instance;
+    }
+}
