Singleton: Difference between revisions

Content added Content deleted

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@@ Line 300: / Line 300: @@
 ===Thread-safe===
+Double-checked locking
+only use with Java 1.5+
 <java>
 class Singleton
 {
     private static Singleton myInstance;
-    public static synchronized Singleton getInstance()
+    public static Singleton getInstance()
     {
         if (myInstance == null)
-            myInstance = new Singleton();
+            synchronized(this)
+                if (myInstance == null)
+                    myInstance = new Singleton();
         return myInstance;