Scanner scan = new Scanner(System.in);    System.out.print("Enter 2 numbers: ");    int num1 = scan.nextInt();    int num2 = scan.nextInt();    System.out.println("Numbers Saved! Choose your operator + - * / ");    String operator = scan.next();    int result;    result = (operator.equals("+")) ? (num1 + num2) : (num1);    System.out.println("The addition result is " +result);    result = (operator.equals("-")) ? (num1 - num2) : (num1);    System.out.println("The subtraction result is " +result);    result = (operator.equals("*")) ? (num1 * num2) : (num1);    System.out.println("The multiplication result is " +result);    result = (operator.equals("/")) ? (num1 / num2) : (num1);    System.out.println("The division result is " +result);}}這是我的簡單計算器代碼，例如，當我選擇+選項時，它會運行所有System.out.println行，我如何防止它這樣做并且只執行與運算符匹配的println？