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Abstraction In Java Programming Short Explanation

HabeebaKoya.

 ABSTRACT CLASS AND ABSTRACT  METHOD IN JAVA 


What is abstraction in java?

Showing only  essential parts and  hiding the implementation part. This is called abstraction.This can be achieved by  java programming.

Ex:-- while download  android application in playstore we get only .exe file.when running this exe file the software will work but we cannot see the implementation part.This type of application can be done by java programming,this technique is called abstraction or data hiding


Abstract class and abstract method


abstract class and abstract method in java with example

We know that abstraction is a pillar of the oops concepts,and abstraction is showing only essential parts and hiding implementation details.The class contains variables, methods and constructors.So if any class consists of at least one abstract method then the class will be called an abstract class. The abstract class and abstract method is created using the abstract keyword.An abstract class cannot create objects.If any class consists of only the declaration of a method and hiding the implementation part is called abstract method.The class contains the complete implementation of all the method,that class will called as a concrete class. There will be no abstract methods in concrete class.


Characteristics of abstract method

* only declaration but no definition.

* Implementation written in sub class

Characteristics of abstract class

* contains at least one abstract method

* also contain normal method

* object cannot be created

Characteristics of concrete class

* It should contains complete definition for all the method

* object can be created


Java example program in abstraction-notepad CMD output


abstract class Aa
{ abstract void display();//method declaration only void show() { System.out.println("show method is normal method"); } } class Bb extends Aa { void display() { System.out.println("display method definition"); } } class Abstract { public static void main(String args[]) { Bb obj=new Bb(); System.out.println(); obj.display(); obj.show(); } }

observe program and its output carefully

notepad CMD output of Java abstraction example program



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