Added comments for Builder example.

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

@@ -2,6 +2,22 @@ package com.iluwatar;
 
 import com.iluwatar.Hero.HeroBuilder;
 
+/**
+ * 
+ * This is the Builder pattern variation as described by
+ * Joshua Bloch in Effective Java 2nd Edition.
+ * 
+ * We want to build Hero objects, but its construction
+ * is complex because of the many parameters needed. To
+ * aid the user we introduce HeroBuilder class. HeroBuilder
+ * takes the minimum parameters to build Hero object in
+ * its constructor. After that additional configuration
+ * for the Hero object can be done using the fluent
+ * HeroBuilder interface. When configuration is ready
+ * the build method is called to receive the final Hero
+ * object.
+ *
+ */
 public class App 
 {
     public static void main( String[] args )

builder/src/main/java/com/iluwatar/Hero.java

@@ -1,5 +1,10 @@
 package com.iluwatar;
 
+/**
+ * 
+ * The class with many parameters.
+ *
+ */
 public class Hero {
 
 	private final Profession profession;
@@ -73,6 +78,11 @@ public class Hero {
 		this.armor = builder.armor;
 	}
 
+	/**
+	 * 
+	 * The builder class.
+	 *
+	 */
 	public static class HeroBuilder {
 
 		private final Profession profession;
@@ -113,7 +123,5 @@ public class Hero {
 		public Hero build() {
 			return new Hero(this);
 		}
-		
 	}
-	
 }