Question

Animal is the parent class of Cat class.

public static void main (String[] args)
{
Animal myCat1 = new Cat;  //Allocation 1
Cat myCat2 = new Cat;    //Allocation 2
}

What is the diffrerence of two allocation??Each is true ,isn’t it?

Answer 1

Neither of these are valid. You need (). Apart from that:

• the first referes to the instance by its superclass
• the second refers to it by its class

You can refer to any object by any of its superclasses, up to Object. This is polymorphism.