用java设计一个可以执行基本数学运算（加减乘除）的计算器程序

用户输入两个数字，一个运算符（+ 、-、 *、/ ）

根据所选运算符执行相应的数学运算，显示运算结果

package month9;
import java.util.Scanner;
public class computer {
    public static void main(String[] args) {
        test();
    }
    public static void test() {
        //1.键盘录入两个数字和运算符
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入第一个数字: ");
        double num1 = sc.nextDouble();

        System.out.println("请输入第二个数字: ");
        double num2 = sc.nextDouble();

        System.out.println("请输入运算符号(+,-,*,/): ");
        String operator = sc.next();

        //2.把数据交给一个方法进行运算
        double result = calculate(num1, num2, operator);

        //3.输出结果
        System.out.println("结果为:" + result);
        
    }
    public static double calculate(double num1, double num2, String operator) {
        double result = 0;
        switch (operator) {
            case "+":
                result = num1 + num2;
                break;
            case "-":
                result = num1 - num2;
                break;
            case "*":
                result = num1 * num2;
                break;
            case "/":
                result = num1 / num2;
                break;
            default:
                System.out.println("输入的运算符号有误！");
                break;
        }
        return result;
    }
         
}