Java Design patterns

Java Design Patterns/javadevjournal/design/creational/singleton/SingletonMultiThreaded.java

@@ -0,0 +1,23 @@
+package javadevjournal.design.creational.singleton;
+
+public class SingletonMultiThreaded {
+
+    /* private instance variable  */
+    private static volatile SingletonMultiThreaded INSTANCE;
+  
+    /* private constructor */
+    private SingletonMultiThreaded() { }
+
+    public static SingletonMultiThreaded getInstance() {
+        /* double-checking lock */
+        if(null == INSTANCE){
+            /* synchronized block */
+            synchronized (SingletonMultiThreaded.class) {
+                if(null == INSTANCE){
+                    INSTANCE = new SingletonMultiThreaded();
+                }
+            }
+        }
+        return INSTANCE;
+    }
+}