Commented the code.

double-dispatch/src/main/java/com/iluwatar/Rectangle.java

@@ -1,5 +1,11 @@
 package com.iluwatar;
 
+/**
+ * 
+ * Rectangle has coordinates and can be checked for overlap against
+ * other Rectangles.
+ *
+ */
 public class Rectangle {
 
 	private int left;