Example Calculator

Calculator.java

import java.util.Scanner;

public class Calculator {

    double x;
    double y;
    double result;
    int Operation;

    public static void main(String[] args) {
        Scanner input = new Scanner (System.in);
        Calculator a = new Calculator();
        double result, Operation, x, y;

        System.out.println("Pilih Operation \n=============");
        System.out.println("1.Tambah\n2.Kurang\n3.Bagi\n4.Kali");
        System.out.println("Masukkan Pilihan Anda : ");
        a.Operation=input.nextInt();

        System.out.println("Masukkan Bilangan 1 : ");
        a.x = input.nextInt();
        System.out.println("Maukkan Bilangan 2 : ");
        a.y = input.nextInt();

        a.Operation();
    }

    public void addition() {
        result = x + y;
    }

    public void subtraction() {
        result = x - y;
    }

    public void division(){
        result = x / y;
    }

    public void multiplication() {
        result = x * y;
    }

    int Operation() {
        switch(Operation) {
            case(1):
                addition();
                System.out.println("Hasil = "+result);
                break;
            case(2):
                subtraction();
                System.out.println("Hasil ="+result);
                break;
            case(3):
                division();
                System.out.println("Hasil = "+result);
                break;
            case(4):
                multiplication();
                System.out.println("Hasil = " +result);
                break;
        }

        return Operation;
    }
}