What is Abstraction in Java - OOPS | Use case | Code for Abstraction

 

What is Abstraction? 

• Abstraction is one of the OOPs concepts. 

• Abstraction is use for data hiding.

• If now method in the abstract class is abstract methods still it can be an abstract class (abstract class support 0 -100% abstraction)

• We can not create an instance/object for a abstract class

• Abstract methods have only declaration () but no implementation {}

• Abstract method can over override and thus it support an OOPs concept call method overriding  

• In Abstraction we have declaration once but implementation multiple times as per our needs.

Example: 

• Abstract Class with 0% abstraction

abstract class Abstract{

  public void A() {}; // Non Abstract Method

  public void B(String S) {}; // Non Abstract Method

This shows that we can create abstract class without any abstract Method

• Abstract Class with 100% abstraction

abstract class Abstract{

  abstract void A(); // Abstract Method

  abstract void A(String S); // Abstract Method

}