3、比较日期

import java.time.*;

import java.util.Scanner;

import java.time.temporal.ChronoUnit;

public class CompareDate {

   public static void main(String[] args) {

   Scanner scanner=new Scanner(System.in);

System.out.println("输入开始的年,月,日");

System.out.println("年月日之间用_,/或.分隔n例如:2018-2-12");

String regex="[_./]";

String []input=scanner.nextLine().split(regex);

int year=Integer.parseInt(input[0]);

int month=Integer.parseInt(input[1]);

int day=Integer.parseInt(input[2]);

LocalDate dateStart=null;

dateStart=LocalDate.of(year, month, day);

System.out.print("输入结束的年,月,日:");

input=scanner.nextLine().split(regex);

year=Integer.parseInt(input[0]);

month=Integer.parseInt(input[1]);

day=Integer.parseInt(input[2]);

LocalDate dateEnd=null;

dateEnd=LocalDate.of(year, month, day);

long days=dateStart.until(dateEnd, ChronoUnit.DAYS);

boolean boo=dateEnd.isAfter(dateStart);

if(boo)

System.out.println(dateEnd+"在"+dateStart+"之后");

System.out.println(dateStart+"在"+dateEnd+"相隔:");

System.out.println(Math.abs(days)+"天(不足一天的零头按0计算)");

   }

}