Why is this code not working (java) public static void main(String[] args) { Scanner input = new Scanner (System.in); System.out.println("Would you like to add, subtract, multiply, or divide?"); String choice = input.next(); System.out.println("Pick an integer number:"); int n1 = input.nextInt(); System.out.println("Pick an integer number:"); int n2 = input.nextInt(); int r1 = Calculations.generateRandomNum(n1, n2); int r2 = Calculations.generateRandomNum(n1, n2); switch (choice){ case "add": System.out.println(r1 + "+" + r2 + "=" + Calculations.add(r1, r2)); break; case "subtract": System.out.println(r1 + "-" + r2 + "=" + Calculations.subtract(r1, r2)); break; case "multiply": System.out.println(r1 + "*" + r2 + "=" + Calculations.multiply(r1, r2)); break; case "divide": System.out.println(r1 + "/" + r2 + "=" + Calculations.divide(r1, r2)); break; default: System.out.println("Invalid"); break; } } }