Abstract class

Anonymous User 995 09 Jul 2018

What is Abstract class and Interface in Java ?

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Prakash nidhi Verma 10 Jul 2018

Abstract class and Interface in Java :

Declaration:

Abstract class is declared using 'abstract' keyword .Interface is declared using 'interface' keyword .

Methods:

Abstract class may contain abstract or concrete methods We can define abstract, default and static methods in an Interface.Access modifiers

Implementation:

Abstract class can not be instantiated but can be extended.Interface can be implemented by another class or can be extended by other interfaces Multiple inheritance.

difference feild is shown below :

- Methods

- Members

- Inheritance

- Member variables

- Members visibility

- Keyword

- main() exists

- Flexibility

Example :

1. Abstract class

abstract class 
{

   abstract void absmethod1();

   abstract void absmethod2();

   void concmethod()

   {

   //concrete method

   }

}

2. Interface

interface myinterface 
{

    void method1();

    void method2();

   // no concrete method

}

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Abstract class

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