Abstract class example program in java

Question : What is Abstract class in JAVA?

Answer : Abstract class is a class that can not be instantiated it's object can not be created! This is because it contain or some method which are abstract or undefined. A class which inherit an abstract class must be define abstract method of the superclass only than the object of subclass can we created, otherwise it's must be declared abstract method of the superclass. 

Example Program : 

abstract class myabstract

{

   abstract void ab1();

   public void ab2()

   {

      System.out.println("Don't forget me I'm inside !!smile!!");

   }

}

class toAbs extends myabstract

{

  void ab1()

  {

     System.out.println("Hello Abstract !!");

  }

  public static void main(String args[])

  {

     myabstract obj = new toAbs();

     obj.ab1();

     obj.ab2();

 }   

}

Save this file : toAbs.java

Compile this file : javac toAbs.java

Run this file : java toAbs

output : 

Hello Abstract !!

Don't forget me I'm inside !!smile!!

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