Q) What about abstract class? Explain?

A)

->if we apply “abstract” modifier to concrete class, it becomes an abstract class.

Ex:

class A

{

}   //concrete class(non-abstract class)

abstract class A

{

}   // abstract class

->abstract class is similar to a concrete class in all aspects, Except 2 differences.

1) It can abstract methods

2) It can’t be instantiated.

->similarity between normal class and abstract class

      Both are user defined classes.

      Both normal and abstract classes are contain the fallowing

-class variables and instance variables

-constructors

-static methods

-instance methods

->to prevent object creation only the abstract class is declared.

->the most generalized class is declared as “abstract class”. i.e. the more generalized class means the top most class in the hierarchy is called most generalized class.

2 important thinks of abstract method:-

1)      70% to 80% token to creating prototype then the implementation of behavior taken 20%.

2)      Enforcing the method overriding.

->abstract class object is not created but reference can be created.