Q) Develop a java application that performs addition and subtraction operations in object oriented manner?

A)

import java.util.Scanner;

class calculator {

       Scanner s= newScanner(System.in);

       void Add (int a , int b)

       {

              int sum=a+b;

              System.out.println("The sum of 20 and 10 is "+sum);

       }

       int subtract()

       {

              System.out.println("Enter a number");

              int n1=s.nextInt();

              System.out.println("Enter 2nd number");

              int n2= s.nextInt();

              int d=n1-n2;

              return d;

       }

       public static void main(String[] args) {

              calculator c= new calculator();

              c.Add(20, 10);

              int difference = c.subtract();

              System.out.println("The difference of 2 numbers is "+difference);

       }

}

Output :
The sum of 20 and 10 is 30

Enter a number

100

Enter 2nd number

50

The difference of 2 numbers is 50