1. /* 
    2.  * Calculate the span of time from today until your birthday, assuming your
    3.  * birthday occured on January 1st. The calculation is done using both
    4.  * months and days (using Period) and days only (using ChronoUnit.between).
    5.  * 计算距离下一次生日还有多长时间，假设生日在1月1日
    6.  * 分别计算了还有几个月零几天和总共还有多少天
    7.  */
    8. import java.time.LocalDate;
    9. import java.time.Month;
    10. import java.time.Period;
    11. import java.time.temporal.ChronoUnit;
    13. import java.io.PrintStream;
    15. public class Birthday {
    17.     public static void main(String[] args) {
    19.         LocalDate today = LocalDate.now();
    20.         LocalDate birthday = LocalDate.of(1960, Month.JANUARY, 1);
    22.         LocalDate nextBDay = birthday.withYear(today.getYear());
    24.         //If your birthday has occurred this year already, add 1 to the year.
    25.         if (nextBDay.isBefore(today) || nextBDay.isEqual(today)) {
    26.             nextBDay = nextBDay.plusYears(1);
    27.         }
    29.         Period p = Period.between(today, nextBDay);
    30.         long p2 = ChronoUnit.DAYS.between(today, nextBDay);
    31.         System.out.println("There are " + p.getMonths() + " months, and " +
    32.                            p.getDays() + " days until your next birthday. (" +
    33.                            p2 + " total)");
    34.     }
    35. }