创建类来实现简易计算器功能

package com.counter;


public class Counter {

    public void count(String fuHao,double a , double b){
        switch (fuHao){
            case "+":
                double sum1 = a + b;
                System.out.println("两数之和为："+sum1);
                break;
            case "-":
                double sum2 = a - b;
                System.out.println("两数之差为："+sum2);
                break;
            case "*":
                double sum3 = a * b;
                System.out.println("两数之积为："+sum3);
                break;
            case "/":
                double sum4 = a / b;
                System.out.println("两数之商为："+sum4);
                break;
        }
    }
}

package com.counter;

import java.util.Scanner;

public class CounterTest {
    public static void main(String[] args) {
        Counter count = new Counter();
        Scanner s = new Scanner(System.in);
        System.out.println("请输入两个要计算的数：");
        double a = s.nextDouble();
        double b = s.nextDouble();
        System.out.println("请输入运算符：");
        String fuHao = s.next();
        count.count(fuHao,a,b);
    }
}