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Defining Abstract Classes:

A structure which is partially implemented – partially unimplemented is known as an abstract class. When we use the keyword abstract before a class, then that class becomes an abstract class. Since abstract classes are partially implemented – partially unimplemented structures, they can have function definitions as well as function definitions with bodies.

Any function definition without a body inside an abstract class would be default public even though we mention it or not. When we extend an abstract class to a normal class then we have to provide bodies in the class for all then we have to provide bodies in the class for all the function definitions defined inside the abstract class.

We cannot create objects of abstract classes directly using the new operator. Instead, we can define a reference to an abstract class and to that reference, we can assign an object of a class which extends the abstract class.

 

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Example:

Abstract class Abs1

{

Public static void main (string args [ ])

Void function2 ()

{

System. Out. Prinln(“ inside the function2() of abstract class Abc1);

}

}

Class Demo1 extends Abs1

{

Public void function 1()

{

}

Public static void main (string args [ ])

{

Demo1 d1 = new Demo 1();

d1. Function 1();

d1. Function D ();

d1. Function 2 ();

// Abs1 a1 = new Demo1 (); // error: cannot create objects of Abs1 using new operator.

Abs1 a2 = new Demo1 ();

a2. Function 1();

a2. Function 2 ();

}

}

An abstract class can extend other classes. It is obvious that when an abstract class does not extend other user-defined classes, then, just like other classes, it extends object class. We can define an abstract class without abstract functions definitions inside it. Hence, defining abstract function definitions inside an abstract class is not compulsory.

 

Abstract Class Assignment Help