What is parent and child class in java

What is parent and child class in java

Hi Noah Baker,

Java is an object oriented programming language and one of the features of OOP is Inheritance that is to extend the features of something that is already available. It is used to enhance reusability of code.

Here, one class inherits the properties of another class using the keyword "extends". The class from which one class derives properties is called a Parent class and the class which derives the property is called a Child/Sub class.

In java, the extended properties can be the data members and the member functions of the parent class.

There are 2 types of inheritance in java.

Simple and Multi level.

Please see the below example which shows Inheritance in Java.

Simple Inheritance

class Parent {

  int par;

  int get(int x){

  par=x; 

  return(0);

  }

  void Show(){

  System.out.println(par);

  }

}

 

class Child extends Parent{

  public static void main(String args[]){

  Parent parent = new Parent();

  parent.get(5);

  parent.Show();

  }

  void display(){

  System.out.println("This is child class");

  }

}

 

 

 

Multi level Inheritance

 

class MainParent {

  int mPar;

  int get(int x){

  mPar=x;

  return(0);

  }

  void Show(){

  System.out.println(mPar);

  }

}

class SubParent extends MainParent{

  void ShowSubParent(){

  System.out.println("I am the sub parent");

  }

}

 

class Child extends SubParent{

  void display(){

  System.out.println("I am the child");

  }

  public static void main(String args[]){

  MainParent mainParent = new MainParent();

  mainParent.get(5);

  mainParent.Show();

  }

}

 

 

Hope it helps.