Inheritance And Types of Inheritance with Real Time Example

                                   

 INHERITANCE

Ø Process of deriving properties or method from one class to another class.

 Ø Implements IS-A relationship.

 Ø Achieves Code Reusability.

 Ø Super class (Parent class) - the class from which the properties are derived.

 Ø Sub class (Child class) - the class where the properties are derived to.

Ø Super class is also called Base class.

Ø Sub class is also called Derived class.

REAL TIME EXAMPLE:

       FATHER-SON relationship.

v  Superclass - Father.

v  Subclass - Son.

       Method or Properties - Father's asset, Father's characteristics.

Types of Inheritance:

Ø Single Inheritance

Ø Multiple Inheritance

Ø Multilevel Inheritance

Ø Hierarchical Inheritance

Ø Hybrid Inheritance

SINGLE INHERITANCE:

 üAs the name indicates, it contains Single parent class and single child class.

 üWhen the properties or behaviour derived from single base class to single child class is called Single Inheritance.

 

REAL TIME EXAMPLE:

Here,

          üAnimal is the Base Class

          üDogs is the Sub Class

MULTIPLE INHERITANCE:

 üContains Multiple parent class and single child class.

 üWhen the properties and behaviour are derived to single child class from more than one parent class is called Multiple Inheritance.

REAL TIME EXAMPLE:

Here,

           üBoth the Classes Animals and Mammals are Base Classes.

           üDogs is the Sub Class.

MULTILEVEL INHERITANCE:

 üWhen the properties are derived to child class from another Derived class is called Multilevel Inheritance.

 üHere the child class implicitly inherit the properties of base class along with the properties of base class’s parent class(base class).

Here Class A is the base class of Class B and also implicit base class of Class C.

Class B is the base class of Class C and also Sub class of Class A.

Class C is the child class of Class B.

Class C inherits the properties of  both Class A and Class B.

REAL TIME EXAMPLE:

Here,

          üAnimals is the Base class for both Mammals and Dogs Classes.

          üMammal is the sub class of Animal but Base Class of Dogs.

         üDogs is the Sub Class and derives properties of both Mammals and Animals Base classes.

HIERARCHICAL INHERITANCE:

üContains Single Parent class (Base Class) and Multiple Child Class (Sub Class).

 üWhen more than one sub classes derive properties or behaviour from the same base class is called Hierarchical Inheritance.

REAL TIME EXAMPLE:

Here,

       üAnimal is the Base Class.

      üDogs and Elephants are the Sub Classes of Animal.

HYBRID INHERITANCE:

üCombination of more than one inheritance.

ØClass A to Class D-Single Inheritance.

ØClass A to Class B and Class B to Class D-Multilevel Inheritance.

ØClass A to Class B and Class A to Class C-Hierarchical Inheritance.

ØClass B and Class C to Class D- Multiple Inheritance.

REAL TIME EXAMPLE:

Here,

üClass Animals to Class Elephants-Single Inheritance.

üClass Animals to Class Mammals and Class Mammals to Class Elephants-Multilevel Inheritance.

üClass Animals to Class Mammals and Class Animals to Class Herbivores-Hierarchical Inheritance.

üClass Mammals and Class Herbivores to Class Elephants- Multiple Inheritance.