Abstract class in Java

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Abstract class in Java

A class that is declared as abstract is known as abstract class. It needs to be extended and its method implemented. It cannot be instantiated.

Example abstract class

abstract class A{}  

Example of abstract class that has abstract method

In this example, Bike the abstract class that contains only one abstract method run. It implementation is provided by the Honda class.
  1. abstract class Bike{  
  2.   abstract void run();  
  3. }  
  4. class Honda4 extends Bike{  
  5. void run(){System.out.println("running safely..");}  
  6. public static void main(String args[]){  
  7.  Bike obj = new Honda4();  
  8.  obj.run();  
  9. }  
  10. }  
Running safely..

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