Abstraction in Java allows hiding unnecessary details through interfaces and abstract classes. Abstract classes can contain abstract and non-abstract methods but cannot be instantiated, and derived classes must override abstract methods. For example, a SHAPE abstract class could define a calculateArea() abstract method for subclasses like Rectangle, Circle, and Triangle to implement differently.

1. Abstraction in JAVA
-By Akanksha Sawarkar

2. What is Abstraction?
 5 major pillars of OOP
 Hiding unnecessary details
 achieved by using interface and abstract
class in Java

3. Abstract Classes & Methods
• abstract keyword
• Contains method Declarations only
• can not create object of it
• Abstract & non abstract methods
• Should override method in derived class

4. Example:
SHAPE
Rectangle Circle Triangle
Syntax:
abstract public void calculateArea();
calculateArea()

5. Thank you