Improved decorator example.

decorator/src/main/java/com/iluwatar/App.java

@@ -6,18 +6,23 @@ package com.iluwatar;
  * class implements the same interface as the target and uses composition to
  * "decorate" calls to the target.
  * 
+ * Using decorator pattern it is possible to change class behavior during
+ * runtime, as the example shows.
+ * 
  */
 public class App {
 
 	public static void main(String[] args) {
 
+		// simple troll
 		System.out.println("A simple looking troll approaches.");
 		Hostile troll = new Troll();
 		troll.attack();
 		troll.fleeBattle();
 
+		// change the behavior of the simple troll by adding a decorator
 		System.out.println("\nA smart looking troll surprises you.");
-		Hostile smart = new SmartTroll(new Troll());
+		Hostile smart = new SmartTroll(troll);
 		smart.attack();
 		smart.fleeBattle();
 	}