Java实现简单的计算器（加减乘除）

package test;

import java.util.Scanner;

public class Caculater {
    public static void computer(){
        Scanner scanner=new Scanner(System.in);
        int a=0;
        System.out.println("请输入第一个数字：");
        while(true){
            String line = scanner.nextLine();
            try {
                a=Integer.parseInt(line);
                break;
            } catch (Exception e) {
                System.out.println("输入错误，请重新输入:");

            }
        }
        System.out.println("请输入运算符：");
        String operator=null;
        while(true){
            operator = scanner.nextLine();

            if (!"+".equals(operator)&&!"-".equals(operator)&&
                    !"*".equals(operator)&&!"/".equals(operator)) {
                System.out.println("请输入正确的运算符：");

            }else {
                break;
            }
        }
        System.out.println("请输入第二个数字：");
        int b = 0;
        while(true){
            String line = scanner.nextLine();
            try {
                b=Integer.parseInt(line);
                if ("/".equals(operator)&&b==0) {
                    throw new Exception();
                }
                break;
            } catch (Exception e) {
                System.out.println("输入错误，请重新输入:");

            }
        }
        if ("+".equals(operator)) {
            System.out.println("运算结果为："+(a+b));
        }else  if("-".equals(operator)){
            System.out.println("运算结果为："+(a-b));
        }else if ("*".equals(operator)) {
            System.out.println("运算结果为："+(a*b));
        }else {
            System.out.println("运算结果为："+(a/b));
        }
    }

    public static void main(String [] args){
        Caculater.computer();
    }

}