粗略写一个计算器 实现加减乘除 - I

//作业：写一个计算器，要求实现加减乘除功能，并且能够循环接受新的数据，通过用户交互实现

package com.zhang.method;import java.util.Scanner;public class homeworkDemo {public static void main(String[] args) {Scanner scanner =new Scanner(System.in);int a=0;int b=0;System.out.println("请输入两个操作数");if(scanner.hasNextInt()){a=scanner.nextInt();b=scanner.nextInt();}else {System.out.println("非法操作数数");}System.out.println("请输入操作符");if(scanner.hasNext()) {String operator = scanner.next();int result =0;switch(operator){case "+":result = add(a,b);break;case"-":result = sub(a,b);break;case "*":result = mul(a,b);break;case "/":result = div(a,b);break;default:break;}System.out.println(result);}scanner.close();}private static int add(int n1, int n2) {return n1+n2;}private static int sub(int n1, int n2) {return n1-n2;}private static int mul(int n1, int n2) {return n1*n2;}private static int div(int n1, int n2) {return n1/n2;}}