Changed package naming across all examples.

null-object/src/main/java/com/iluwatar/nullobject/App.java

@@ -0,0 +1,32 @@
+package com.iluwatar.nullobject;
+
+/**
+ * 
+ * Null Object pattern replaces null values with neutral objects.
+ * Many times this simplifies algorithms since no extra null checks
+ * are needed.
+ * 
+ * In this example we build a binary tree where the nodes are either
+ * normal or Null Objects. No null values are used in the tree making
+ * the traversal easy.
+ *
+ */
+public class App 
+{
+    public static void main( String[] args ) {
+    	
+    	Node root = new NodeImpl("1",
+    			new NodeImpl("11",
+    					new NodeImpl("111",
+    							NullNode.getInstance(),
+    							NullNode.getInstance()),
+    					NullNode.getInstance()), 
+    			new NodeImpl("12",
+    					NullNode.getInstance(),
+    					new NodeImpl("122",
+    							NullNode.getInstance(),
+    							NullNode.getInstance())));
+
+    	root.walk();
+    }
+}