Using the same method name with the same argument list and 
return type called method overriding. However in Java 5, the
 ruturn type of the overrriding method may be changed with
the subtype of the overridden method.

Using the same method name with the same argument list and 
return type called method overriding. However in Java 5, the
 ruturn type of the overrriding method may be changed with
the subtype of the overridden method.