LocalDate类withDayOfYear()方法 (LocalDate Class withDayOfYear() method)

• withDayOfYear() method is available in java.time package.

  withDayOfYear()方法在java.time包中可用。

• withDayOfYear() method is used to update this object with the given day-of-year (dd_of_yyyy) in this LocalDate.

  withDayOfYear()方法用于在此LocalDate中使用给定的年份(dd_of_yyyy)更新此对象。

• withDayOfYear() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  withDayOfYear()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• withDayOfYear() method may throw an exception at the time of updating this object with the given day of the year.

  withDayOfYear()方法可能会在一年中的给定日期更新此对象时引发异常。

  DateTimeException: This exception may throw when the given parameter holds invalid value.

  DateTimeException ：当给定参数持有无效值时，可能引发此异常。

Syntax:

句法：

public LocalDate withDayOfYear(int dd_of_yyyy);

Parameter(s):

参数：

• int dd_of_yyyy – represents the day-of-year by which to update this object and the number of days in a year starts from 1 and ends at 366.

  int dd_of_yyyy –表示每年更新该对象的日期，一年中的天数从1开始，以366结尾。

Return value:

返回值：

The return type of this method is LocalDate, it returns the LocalDate that holds the value to update the day-of-year of this object with the given day-of-year.

该方法的返回类型为LocalDate ，它返回LocalDate，该LocalDate包含用给定的年份更新该对象的年份的值。

Example:

例：

// Java program to demonstrate the example // of withDayOfYear(int dd_of_yyyy) // method of LocalDateimport java.time.*;public class WithDayOfYearOfLocalDate {
       public static void main(String args[]) {
           int day_of_year = 50;        // Instantiates two LocalDate        LocalDate l_da1 = LocalDate.parse("2007-04-04");        LocalDate l_da2 = LocalDate.of(2008, Month.FEBRUARY, 06);        // Display l_da1,l_da2         System.out.println("LocalDate l_da1,l_da2 : ");        System.out.println("l_da1: " + l_da1);        System.out.println("l_da2: " + l_da2);        System.out.println("day_of_year to update: " + day_of_year);        System.out.println();        // Here, this method updates day-of-year        // with the given value in this LocalDate         // l_da1        LocalDate l_date = l_da1.withDayOfYear(day_of_year);        // Display l_date        System.out.println("l_da1.withDayOfYear(day_of_year): " + l_date);        // Here, this method updates day-of-year        // with the given value in this         // LocalDate l_da2        l_date = l_da2.withDayOfYear(day_of_year);        // Display l_date        System.out.println("l_da2.withDayOfYear(day_of_year): " + l_date);    }}

Output

输出量

LocalDate l_da1,l_da2 : l_da1: 2007-04-04l_da2: 2008-02-06day_of_year to update: 50l_da1.withDayOfYear(day_of_year): 2007-02-19l_da2.withDayOfYear(day_of_year): 2008-02-19

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