Java Programming Session 25: OOP Principle Data Abstraction In Java
Hello Everyone,
Welcome to My channel Priyankaaz IT School.
In this live training I have explained about Data Abstraction Principle in Java.
Data Abstraction
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It is process of hiding implementation details of software from end user.
Abstraction achive in Java using
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1.Abstarct class
2.Interface
1.Abstarct class
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1.In abstract class we can have both abstarct method and non abstarct (concreate) Methods.
2.Abstract method and class we can declare using abstarct keyword.
3.Abstarct class can not be instantiated.
4.Abstract methods must be overriden by class which inherits abstract class.
5.Using Abstract class partial abstraction is possible.
Interface
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1.An interface in java is a blueprint of a class.
2.Interface contains final and static variables.
3.Interface contains abstract methods.
4.An abstract method is a method contains definition but not body.
5.Methods in interface are public by default.
6.Interface supports the functionality of multiple inheritance.
7.We can define interface with interface keyword.
8.A class extends another class, an interface extends another interface
but a class implements an interface.
9.We can create Object reference for Interface but we cannot instantiate interface.
10.Inheritance use extends keyword and Interface use implements keyword.