Creating Class and Child Class with extends- Example0007

Creating Class and Child Class with extends- Example0007

Using 'extends' keyword to create a child Class- IS-A relation.
We 'extend' a child Class with IS-A relation. Child Class will have all the methods and attributes.
The child can have additional attributes or methods. But that is for another example

Keyword: java, extends, inheritance, IS-A, IS-A relation, child class, parent class, sub class, parent class


package com.swprogramdeveloper;

//Textual presentation of an object, how it will look like in the memory
//Whatever we write in class is actually belong to object. Note: if you want something for class, need to write static
class Product {
    //Attribute
        int pid;
        String name;
        int price;


        //Constructor
        Product() {
        System.out.println(">>Product Object Constructed");
        }

        //Methods
        //Method one to initialize data
         void setProductDetails(int pid, String name, int price){
         this.pid=pid;
         this.name=name;
         this.price=price;
         }

        //Method to display data
         void showProductDetails(){
             System.out.println("-----Product ID: "+pid+"----------");
             System.out.println("Name:\t"+name);
             System.out.println("Price:\t"+price);
             System.out.println("---------------------------");
         }
        }

//IS-A relation and extends
 class Mobile extends Product {
    // Constructor
    Mobile() {
        System.out.println("--Mobile Constructor created---");
    }
}

public class Main {

    public static void main(String[] args) {

        // Creating class from extended class
        System.out.println("---Output of extended mobile class from product----");

        Mobile mobile1 = new Mobile();

        mobile1.setProductDetails(980,"mi note2",23000);
        mobile1.showProductDetails();
    }
}



Output0007
=======

---Output of extended mobile class from product----
>>Product Object Constructed
--Mobile Constructor created---
-----Product ID: 980----------
Name: mi note2
Price: 23000
---------------------------

Process finished with exit code 0