Problem Operator

package com.company;
import java.util.Scanner;

public class Operator {

    public static void main(String[] args) {
        // write your code here
        Scanner s = new Scanner(System.in);

        //Am citit operatorul
        String operator = s.nextLine();

        //Citim numere ce trebuie operate
        int nr1 = s.nextInt();
        int nr2 = s.nextInt();

        int expresie;

        switch (operator) {
            case "+":
                expresie = nr1 + nr2;
                System.out.printf("%d %s %d = %d", nr1, operator, nr2, expresie);
                break;
            case "-":
                expresie = nr1 - nr2;
                System.out.printf("%d %s %d = %d", nr1, operator, nr2, expresie);
                break;
            case "/":
                expresie = nr1 / nr2;
                System.out.printf("%d %s %d = %d", nr1, operator, nr2, expresie);
                break;
            case "%":
                expresie = nr1 % nr2;
                System.out.printf("%d %s %d = %d", nr1, operator, nr2, expresie);
                break;
            case "*":
                expresie = nr1 * nr2;
                System.out.printf("%d %s %d = %d", nr1, operator, nr2, expresie);
                break;
        }
    }
}