Abstraction

Abstraction is a process of showing functionality and hiding other internal/implementation details.

Achieving Abstraction via:-

1. Abstract class
2. Interface

Abstract class:-

Abstract class is a class which cannot be instantiated but they can be sub classed. We can declare abstract class by using abstract keyword.

• Only abstract class can have abstract method (abstract method is a method that is declared without an implementation).
• We cannot use private and static method in abstract class.

For Ex: - Classes Rectangle, Circle and Line inherit from MyGraphic

Simple Example of Abstract Class:-

Every non abstract subclass of MyGraphic must provide implementations for the draw and resize method:-