CONCEPT OF OOPS -OBJECT ORIENTED PROGRAMMING
What is Abstraction,Encapsulation,Inheritance,Polymorphism?
- ABSTRACTION: Abstraction means to show only the necessary details and hiding non essential features. Abstraction is done when we need to inherit from certain class but do not instantiate the objects of that class.
- ENCAPSULATION : Encapsulation is wrapping/binding up of data and member functions in single unit.
In simple, abstraction is hiding the implementation and encapsulation is to hide data.
- INHERITANCE : Inheritance enables you to create new classes that reuse ,extend and modify the behaviour that is defined in other classes. In simple terms when one class inherit the properties , methods etc. of the other class is known as inheritance. The class whose members are inherited are called base class and other class is known as derived class .
for eg : using system ;
public class baseclass{
public class baseclass( )
{ console.writeline("this is base class constructor");}
public void hello( )
{ console.writeline("this is baseclass");}
}
public class derivedclass: baseclass
{public dervedclass( )
console.writeline("this is derivedconstructor");
}
public static void main( )
{ derivedclass obj = new derivedclass();
obj.hello( );
}
OUTPUT : this is baseclass constructor
this is derived constructor
this is baseclass
- POLYMORPHISM : When an object exhibits different behaviour in different situation. In simple way when a message can be processed in different ways/forms .
Polymorphism is of two types : Compile time polymorphism (this is concept
of OVERLOADING).
Runtime Polymorphism : (this is concept of OVERRIDING).
