#61 Abstract Keyword in Java

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In this lecture we will learn:
– What is Abstraction?
– Abstract method in Java
– Abstract class in Java
– Abstract vs Concrete classes

#1
Abstraction is a process of hiding the implementation details and showing only functionality to the user.

#2
Abstract method:-
– Instead of defining the method, we can declare the method.
– If we put a semicolon at the end of a method, it means that you only declare the method like:
public void drive();
– This method does not contain any features and you will not be able to create an object of it.
– You need to add an abstract keyword to only declare a method.

#3
Abstract class:-
– Abstract methods can only be defined in an abstract class.
– We need to add an abstract keyword before a class to make it an abstract class.
– Objects of an abstract class can not be created.
– If you are extending an abstract class, then it is compulsory to define all abstract methods.
– It is not necessary that an abstract class should have an abstract method.
– Abstract class can have an abstract or a normal method or both.
– An abstract class can have more than one abstract method.

#4
Concrete class: A class other than an abstract class is known as a concrete class.
– An object of a concrete class can be created.

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