Polymorphism in java.

Polymorphism in java – means the ability of a single variable of a given type to be used to reference objects of
different types, and automatically call the method that is specific to the type of object the variable references. In a
nutshell, polymorphism is a bottom-up method call. The benefit of polymorphism is that it is very easy to add new
classes of derived objects without breaking the calling code (i.e. getTotArea() in the sample code shown
below) that uses the polymorphic classes or interfaces. When you send a message to an object even though you
don’t know what specific type it is, and the right thing happens, that’s called polymorphism. The process used by
object-oriented programming languages to implement polymorphism is called dynamic binding.