JAVA简易计算机代码

package Methon;
import java.util.Scanner;
public class Demo04 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        double a = scanner.nextDouble();

        char o = scanner.next().charAt(0);

        double b = scanner.nextDouble();

        computer(a,o,b);
    }
    public static void computer(double num1,char operator,double num2){
            double result = 0;
            switch (operator) {
                case '+':
                    result = num1 + num2;
                    System.out.println(result);
                    break;
                case '-':
                    result = num1 - num2;
                    System.out.println(result);
                    break;
                case '*':
                    result = num1 * num2;
                    System.out.println(result);
                    break;
                case '/':
                    if (num2 == 0) {
                        System.out.println("除数不能为0");
                        break;
                    }
                    result = num1 / num2;
                    System.out.println(result);
                    break;
                default:
                    System.out.println("无效的运算符");
                    break;
            }

        }

}

新手初学 欢迎大佬指正、优化