calculator/java

import java.util.Scanner;
import java.util.regex.MatchResult;

public class Main {
	public static void main(String args[]) {

		double firstNumber;
		double secondNumber;
		double answer = 0;
		String operator;

		Scanner Calc = new Scanner(System.in);

		System.out.println("\\\\CALCULATOR\\\\");

		System.out.println("Enter first number");
		firstNumber = Calc.nextDouble();

		System.out.println("Enter the math operator to use for this calculation");
		operator = Calc.next();

		System.out.println("Enter second number");
		secondNumber = Calc.nextDouble();

		if (operator == "+") {
			answer = firstNumber + secondNumber;
		} else if (operator == "-") {
			answer = firstNumber - secondNumber;
		} else if (operator == "/") {
			answer = firstNumber / secondNumber;
		} else if (operator == "*") {
			answer = firstNumber * secondNumber;
		}

		System.out.println(answer);
	}
}