OOP questions

[Marfhew]

Polymorphism is storing a subclass typed variable in a superclass typed variable. That was terrible wording. Look at my example:

code:

public class A{ //Not important } public class B extends A{ //Not important }

So B is a subclass of A
Polymorphism is doing this:
A variableName = new B();
It's convenient when you have multiple subclasses of A and you want to interchange which subclass type the variable holds