Inheritance in java

  Inheritance:

• It is the process of joining two or more classes and we can access the values from both classes.

Types of Inheritance:

1) Single inheritance

2) Multilevel inheritance

3) Hierarchical inheritance

4) Hybrid inheritance

Benefits of inheritance:

• Software re-usability
• Information hiding
• Code sharing

Syntax:

1. class a

   {

             //Base class

   }

   class b extends a

   {

             //Derived class

   }

   Object creation:

   Derived_class_name object_name =new derive_class_name();

   object_name.function(parameter list); //If use constructor then NO need this

Example:

1. import java.util.Scanner;

   class item // Base class

   {

       String item_name;

       int qty;

       float price;

       double amt;

       Scanner sc = new Scanner(System.in);

       item() //Constructor

       {

           System.out.println("Enter item name : ");

           item_name = sc.next();

           System.out.println("Enter number of quantity : ");

           qty = sc.nextInt();

           System.out.println("Enter item price : ");

           price = sc.nextFloat();

           amt = qty * price;

       }

   }

    

   class display extends item // Derived class

   {

       display() {

           System.out.println("\nOutput of Item details with total amount........... ");

           System.out.println("Item name : " + item_name);

           System.out.println("Quantity : " + qty);

           System.out.println("Item price : " + price);

           System.out.println("Total amout : " + amt);

       }

   }

   public class Constructor_with_inheritance {

       public static void main(String args[]) {

           display d = new display();//Object

       }

   }

Output:

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