Abstract methods and abstract classes

Steffi Graph Preethi S Steffi Graph Preethi S

Steffi Graph Preethi S

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发布日期: 2024年12月3日
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Day 12:

What is Abstraction?

Hiding the Implementation details. Interface allows 100% Abstraction, whereas Abstraction allows 0 to 100% abstraction.

Abstract methods and abstract classes

Abstract methods and abstract classes enable partial abstraction. They allow to define a blueprint for future implementations while leaving specific details to be completed by subclasses.

Abstract Method

An abstract method is a method that:

  1. Has no implementation (only a declaration).
  2. Must be implemented by subclasses of the containing abstract class.
  3. Is declared using the abstract keyword.

If a class has Abstract methods then the specific method and class both needs to be declared Abstract. Subclasses must implement all the abstract methods, unless they are also abstract.

Abstract Class

A class declared with the abstract keyword is Abstract class. It can have all methods as abstract or no methods as abstract. Subclasses must implement all abstract methods, unless they are also abstract.


  • Abstract classes can have constructors, fields, and concrete methods.
  • A mix of fully implemented (concrete) methods and abstract methods.
  • Used as a base class for other classes to derive from.
  • Cannot be instantiated directly.

Example:


Abstract class with Abstract method Execute test



Subclass that implements the abstracted method execute test


Hope Abstraction is understood well . Let's see polymorphism Tomorrow. Happy Learning :)


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