使用java写一个计算器，实现加减乘除功能，并且能够循环接收新的数据，通过用户交互实现

思路推荐：

• 写四个方法：加减乘除
• 利用循环+switch进行用户交互
• 传递需要操作的两个数
• 输出结果
  代码：

package com.cuit.method;

import java.util.Scanner;

public class Calculator {
    public static void main(String[] args) {
        Calculator calculator = new Calculator();
        Scanner scanner = new Scanner(System.in);

        //for循环和switch实现用户交互
        for (int i = 0; i < 100; i++) {

            System.out.println("1. 加法");
            System.out.println("2. 减法");
            System.out.println("3. 乘法");
            System.out.println("4. 除法");
            System.out.println("=====================");

            System.out.println("第"+(i+1)+"次使用计算器，请选择计算器功能：");
            int count = scanner.nextInt();
            System.out.println("请输入进行操作的两个数据：");
            switch (count){
                case 1:
                {
                    double num1 = scanner.nextDouble();
                    double num2 = scanner.nextDouble();
                    System.out.println("加法结果为："+calculator.add(num1,num2));
                    break;
                }
                case 2:
                {
                    double num1 = scanner.nextDouble();
                    double num2 = scanner.nextDouble();
                    System.out.println("减法结果为："+calculator.sub(num1,num2));
                    break;
                }
                case 3:
                {
                    double num1 = scanner.nextDouble();
                    double num2 = scanner.nextDouble();
                    System.out.println("乘法结果为："+calculator.mul(num1,num2));
                    break;
                }
                case 4:
                {
                    double num1 = scanner.nextDouble();
                    double num2 = scanner.nextDouble();
                    System.out.println("除法结果为："+calculator.div(num1,num2));
                    break;
                }
                default:
                    System.out.println("输入错误，请重新输入");
                    break;
            }
            System.out.println();
        }


    }

    public double add(double num1,double num2){//加法
        return num1+num2;
    }

    public double sub(double num1,double num2){//减法
        return num1-num2;
    }

    public double mul(double num1,double num2){//乘法
        return num1*num2;
    }
    public double div(double num1,double num2){//除法
        return num1/num2;
    }

}

运行结果：