Added Lazy Loading idiom.

lazy-loading/src/main/java/com/iluwatar/App.java

@@ -0,0 +1,33 @@
+package com.iluwatar;
+
+/**
+ * 
+ * Lazy loading idiom defers object creation until needed.
+ * 
+ * This example shows different implementations of the pattern
+ * with increasing sophistication.
+ * 
+ * Additional information and lazy loading flavours are described in
+ * http://martinfowler.com/eaaCatalog/lazyLoad.html
+ *
+ */
+public class App 
+{
+    public static void main( String[] args ) {
+    	
+    	// Simple lazy loader - not thread safe
+    	HolderNaive holderNaive = new HolderNaive();
+    	Heavy heavy = holderNaive.getHeavy();
+    	System.out.println("heavy=" + heavy);
+    	
+    	// Thread safe lazy loader, but with heavy synchronization on each access
+    	HolderThreadSafe holderThreadSafe = new HolderThreadSafe();
+    	Heavy another = holderThreadSafe.getHeavy();
+    	System.out.println("another=" + another);
+    	
+    	// The most efficient lazy loader utilizing Java 8 features
+    	Java8Holder java8Holder = new Java8Holder();
+    	Heavy next = java8Holder.getHeavy();
+    	System.out.println("next=" + next);
+    }
+}