"The methods defined in the parent class will always override the methods defined in the base class". What does this statement means?

Answer

The above statement is a concept of Polymorphism in Perl. To clarify the statement, let’s take an example:

This program displays:

Inside Z::foo

– In the above example, the foo() method defined in class Z class overrides the inheritance from class X. Polymorphism is mainly used to add or extend the functionality of an existing class without reprogramming the whole class.