借过。

     int result = 0;
        System.out.println("请输入一个整数：");
        Scanner numInput = new Scanner(System.in);
        int num1 = numInput.nextInt();
        System.out.println("请再输入一个整数：");
        Scanner numInput1 = new Scanner(System.in);
        int num2 = numInput1.nextInt();
        System.out.println("请输入一个算数运算符：");
        Scanner operationInput = new Scanner(System.in);
        char op = operationInput.next().charAt(0);
        
        switch (op)
        {
            case '+':
                result = num1 + num2;
                break;
            case '-':
                result = num1 - num2;
                break;
            case '/':
                result = num1 / num2;
                break;
            case '*':
                result = num1 * num2;
                break;
            default:
                System.out.println("参数输入错误！");
                return;
        }
        
        System.out.println("计算结果为：" + result);