Java进行加减乘除运算得出结果

Java 输入两个数字以及运算符号得出结果

package Test;

import java.util.Scanner;
//变量命名要规范，除数不能为0，要考虑输入字符的情况
//Ctrl+Alt+T自动生成trycatch
public class ComputerTest {
    public static void main(String[] args) {
        try {
            System.out.println("请输入数字A：");
            Scanner scanner = new Scanner(System.in);
            double numberA = scanner.nextDouble();
            System.out.println("请输入运算符（+,-,*,/）：");
            String operate= scanner.next();
            System.out.println("请输入数字B：");
            double numberB = scanner.nextDouble();
            double result = 0;
            switch (operate){
                case "+":
                    result = numberA+numberB;
                    break;
                case "-":
                    result = numberA-numberB;
                    break;
                case "*":
                    result = numberA*numberB;
                    break;
                case "/":
                    if (operate == "0") {
                        System.out.println("分母不能为0");
                        break;
                    }
                    result = numberA/numberB;
                    break;
                default:
                    throw new IllegalStateException("Unexpected value: " + operate);
            }
            System.out.println("结果是："+result);
        } catch (IllegalStateException e) {
            System.out.println("输入有误");
            e.printStackTrace();
        }
    }

}