JAVA-计算器（四则混合运算）do while

package com.boke;

import java.util.Scanner;

public class Test {
    public static void main(String[] args) {

        Scanner s = new Scanner(System.in);

        do {
            System.out.println("您已进入简单计算器 如需退出请按Z/重算请按H");

            //进入第一个数字并判断是否为z/h
            System.out.println("请输入第一个数字 ");
            String num1 = s.next();
            if(num1.equals("z")){
                System.out.println("已退出简单计算");
                return;
            }else if(num1.equals("h")){
                System.out.println("重新开始运算");
                continue;
            }

            //进入第二个符号并判断是否为z/h
            System.out.println("请输入符号 ");
            String symbol =s.next();
            if(symbol.equals("z")){
                System.out.println("已退出简单计算");
                return;
            }else if(symbol.equals("h")){
                System.out.println("重新开始运算");
                continue;
            }

            //进入第三个数字并判断是否为z/h
            System.out.println("请输入第二个数字 ");
            String num2 = s.next();
            if(num2.equals("z")){
                System.out.println("已退出简单计算");
                return;
            }else if(num2.equals("h")){
                System.out.println("重新开始运算");
                continue;
            }

            if(symbol.equals("+")){
                System.out.println(num1 + symbol + num2 + " = " + (Integer.parseInt(num1)+Integer.parseInt(num2)));
            }else if(symbol.equals("-")){
                System.out.println(num1 + symbol + num2 + " = " + (Integer.parseInt(num1)-Integer.parseInt(num2)));
            } else if (symbol.equals("*")){
                System.out.println( num1 + symbol + num2 + " = " + (Integer.parseInt(num1)*Integer.parseInt(num2)));
            }else if(symbol.equals("/")){
                System.out.println( num1+ symbol + num2 +  " = " + (Integer.parseInt(num1)/Integer.parseInt(num2)));
            }else {
                System.out.println("您输入的符号不对！！！不能进行运算,请重新输入");
                continue;
            }
        }while (true);
    }
}