#Coding || Java || Inheritance

 

Java Inheritance

 The mechanism of deriving a new class from an old one is called inheritance

⚫ Allows subclasses to inherit all the variables  and methods of their parent classes

⚫ Old Class-> Base Class->Super class-> Parent Class

⚫ New Class-> Subclass->Derived Class-> child clas.

Types of Inheritance

              

Defining a Subclass in Java

• Inheritance is declared using the "extends" keyword.
• If inheritance is not defined, the class extends a class called Object

         Class subclassname extends superclassname

   {

      variables declaration

      methods declaration

}

Inheritance Hierarchy

Each  Java class has one (and only one) superclass.

Inheritance creates a class hierarchy

Classes higheer in the hierarchy are more general and more abstract

Classes lower in the hierarchy are more specific .

package com.demo;

public class Parent1 {

static

{

System.out.println("This is ststic block of Parent");

}

static

{

System.out.println("This is ststic block1 of Parent");

}

{

System.out.println("This is non static block of Parent");

}

public Parent1()

{

System.out.println("This is Parent");

}

public static void Demo()

{

System.out.println("Demo Methood");

}

}

public class Child1 {

static

{

System.out.println("This is static of Child");

}

{

System.out.println("This is non static of child");

}

      public Child1()

      {

      System.out.println("This is Child");

      }

}

public class Grandchild {

static

{ 

System.out.println("This is Grandchild");

}

}

package com.demo;

public class Client {

public static void main (String[] args)

{

Child1 child1=new Child1();

//p1.Demo();

Parent1 p1=new Parent1();

Grandchild g1=new Grandchild();

}

}

Output:-

This is static of Child

This is non static of child

This is Child

This is ststic block of Parent

This is ststic block1 of Parent

This is non static block of Parent

This is Parent

This is Grandchild