[9] Polymorphism

Polymorphism

What allows performing of a single action in a different ways?

(1) Static

(2) Dynamic

What are the types of polymorphism?

(1) […]

(2) […]

Static Polymorphism

Flow of control is decided during compile time.

Static Polymorphism

It is achieved through method overloading.

Dynamic Polymorphism

Flow of control is decided during runtime.

Dynamic Polymorphism

It is achieved through method overriding.

casting

You can change the existing type of an object reference to another type through […].

(1) Upcasting

(2) Downcasting

Types of Object Casting:

(1) […]

(2) […]

Upcasting

What is casting from a subclass to a superclass?

Downcasting

What is casting from a superclass to a subclass?

exception

runtime

instance

Rules in casting objects:

(1) The compiler will not allow casts to […].

(2) Even when the code compiles without issue, an […] may be thrown at […] if the object being cast is not actually an […] of that class.

(1) same signature

(2) as accessible or more accessible

(3) new or broader

Rules in Overriding Methods:

(1) The method in the child class must have the […] as the method in the parent class.

(2) The method in the child class must be at least […] or […] than the method in the parent class.

(3) The method in the child class may not throw a checked exception that is […] or […] than the class of any exception thrown in the parent class method.