Java OOPC - Inheritance

 

Inheritance

 

In real life inheritance is what that father and mother features genetic things got there babies also along those he or she get unique features.








If we apply that to the java concept inheritance is that parent class method , properties inherit into the child classes.
 
In  other way can tell Inheritance allows you to create a new class that inherits properties and behaviour from an existing class. It is like that passing on the family traits . It promotes code reusability.

In simply manner we can tell inheritance is how one class connect with another class.


 

Derived Class/Sub-class:

Derived class is a class that inherits from a base class. It is also known as subclass or child class. 



Base Class/Superclass: 

​
The base class is the main class where derived classes inherit the features. It is also known as the superclass or parent class. 
 
Properties and methods in the super class inherit to the sub class but properties and methods in the sup class do not inherit to super class. Anyway private properties do not came to sub class even though it is inherited.


Extends keyword in Java


The extended keyword extends a class and is an indicator that a class is being inherited by another class. When you say class B extends a class A, it means that class B is inheriting the properties(methods, attributes) from class A. Here, class A is the superclass or parent class and class B is the subclass or child class.


Code reusability is the main purpose of the inheritance. It reduces write same code again and again it helps to save time and reliability.


Bellow shows syntax and code example for the inheritance.


















There are five types of inheritance in Java:


1) Single Inheritance
2) Multi-Level Inheritance
3) Hierarchical Inheritance
4) Hybrid Inheritance
5) Multiple Inheritance



1. Single Inheritance

 - Consist One parent class and one child class.

 


 

2. Multi-Level Inheritance

- Children class inheritance another children class.




3. Hierarchical Inheritance

- Multiple children inherit one parent class.




4.  Hybrid Inheritance

- Combination of other inheritances.



5. Multiple Inheritance

- Java does not support this.






In real life examples for inheritance saw bellow.











Advantages

  •        Java inheritance enables code reusability and saves time.
  •        Inheritance in Java provides the extensibility of inheriting parent class methods to the child class.
  •        With Java inheritance, the parent class method overriding the child class is possible.

Disadvantages

  •         The inherited methods lag in performance .
  •        Some of the data members of the parent class may not be of any use—as a result, they waste memory.
  •         Inheritance causes strong coupling between parent and child classes. This means, either of the two (Parent class or Child class) become incapable of being used independent of each other.

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