Calculator.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author Chamath
 */
import java.util.Scanner;
public class Calculator {
    public static void main(String[] args) {
        int a;
        int b;
        String operation;
        int answer;
        Scanner scanner = new Scanner(System.in);
        System.out.println("welcome to my calculator");
        System.out.println("Enter first number:");
        a = scanner.nextInt();
        System.out.println("Enter second number:");
        b = scanner.nextInt();
        System.out.println("Enter operation:");
        operation = scanner.next();
        if("+".equals(operation)){
            answer = add(a,b);
            System.out.println("Answer is: "+ answer);
        }else{
            System.out.println("Unsupported operaation");
        }
    }
    private static int add(int a, int b){
        return a+b;
    }
}