Abstract Class in Java

Abstarct CLASS:

Definition: A class which is declared with the abstract keyword is known as an abstract class in Java. It can have abstract and non-abstract methods (method with the body).

i)A class with partial implementation.

ii)NO one can create a object.

iii)No one can call its methods.

iv)Event though class do not contain abstract method we can declare class as abstract

v)It can contain abstract and non abstract method also

***Every child class must provide abstract method implementation.

Example;

public abstarct class vechicle

{

public abstract int Noof whlees();

}

class bus extends vechicle{

public int noof wheels(){

return 6;

}

}

class car extends vechicle{

public int noof wheels(){

return 4;

}

}

class test{

bus b =new bus();

b.noof wheels();

car c= new car();

c.noof  wheels();

}

}

OutPut:

6

4