BirthdayCheck

package com.project;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Scanner;

public class Birthday {

    public static void main(String[] args) throws Exception {
        // TODO Auto-generated method stub
        
        Scanner input = new Scanner(System.in);
        System.out.println("请输入你的出生日期：(例：1999-9-9)");
        String birthday = input.next();
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
        Calendar cal = Calendar.getInstance();
        Date mybirthday = formatter.parse(birthday);
        cal.setTime(new Date());
        int yearNow = cal.get(Calendar.YEAR);// 年
        int monthNow = cal.get(Calendar.MONTH);
        int dayNow = cal.get(Calendar.DAY_OF_MONTH);
        cal.setTime(formatter.parse(birthday));
        int birthYear = cal.get(Calendar.YEAR);
        int birthMonth = cal.get(Calendar.MONTH);
        int birthDay = cal.get(Calendar.DAY_OF_MONTH);
        int num = 0;
        if(monthNow == birthMonth&&dayNow == birthDay){
            System.out.println("祝你生日快乐！！");
        }
        
            while(birthYear < yearNow){
                    cal.set(Calendar.YEAR,cal.get(Calendar.YEAR)+1);
                    birthYear=cal.get(Calendar.YEAR);
                    num++;
            }
        Date ed=new Date();
        Date sd=cal.getTime();
        int days=0;
            if(((sd.getTime() - ed.getTime()) / (3600 * 24 * 1000))> 0 ){
                days=(int)((sd.getTime() - ed.getTime()) / (3600 * 24 * 1000));
                System.out.println("距离你" +num+ "周岁生日还有" + days + "天");
            }else{
                cal.set(Calendar.YEAR,cal.get(Calendar.YEAR)+1);
                sd=cal.getTime();
                days=(int)((sd.getTime() - ed.getTime()) / (3600 * 24 * 1000));
                num +=1;
                System.out.println("距离你" +num+ "周岁生日还有" + days + "天");
           
          }
        long second1 = new Date().getTime();
        long second2 = mybirthday.getTime();
        int day1 = (int)((second1 - second2)/(1000*60*60*24));
        System.out.println("你在这个世界上已经活了" +day1+ "天");
        
        input.close();
    }

}