Java模拟简单计算器

简单计算器
代码如下：

package com.wang.method;

import java.util.Scanner;

public class Demo05 {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入第一个数字");
        //获取输入的第一个数字
        int num1 = scanner.nextInt();
        System.out.println("请输入第二个数字");
        //获取输入的第一个数字
        int num2 = scanner.nextInt();
        System.out.println("请选择计算方式：" + "\n"+"1:+" +"\n"+ "2:-" + "\n"+"3.*" + "\n"+"4:/");
        //获取选择的计算方式
        int choice = scanner.nextInt();
        //计算结果初始化并赋值
        double result = -1;
        if (choice ==1){
            result = add(num1,num2);
            System.out.println(result);
        }else if (choice==2){
             result = minus(num1,num2);
        }else if (choice==3){
             result = multiply(num1,num2);
        }else if (choice==4){
             result = divide(num1,num2);
        }else {
            System.out.println("输入错误");
        }
        System.out.println("结果为"+result);
          //关闭io流
        scanner.close();
    }
     //加法
    public static double add(double a,double b){
        return a + b;
    }
    //减法
    public static double minus(double a,double b){
        return a - b;
    }
    //乘法
    public static double multiply(double a,double b){
        return a * b;
    }
    //除法
    public static double divide(double a,double b){

        return a / b;
    }
}