LocalDateTime类getDayOfYear()方法 (LocalDateTime Class getDayOfYear() method)

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

  getDayOfYear()方法在java.time包中可用。

• getDayOfYear() method is used to get the field value day-of-year from this date-time object.

  getDayOfYear()方法用于从该日期时间对象获取年月日的字段值。

• getDayOfYear() 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.

  getDayOfYear()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。

• getDayOfYear() method does not throw an exception at the time of getting the day of the year.

  getDayOfYear()方法在获取一年中的某天时不会引发异常。

Syntax:

句法：

    public int getDayOfYear();

Parameter(s):

参数：

• None

  没有

Return value:

返回值：

The return type of this method is int, it returns the value day-of-year field and the number of days in a year starts from 1 to 365 (i.e. for Non-Leap Year) or from 1 to 366 (i.e. for Leap Year).

此方法的返回类型为int ，它返回值“年的年”字段，并且一年中的天数从1到365(即非-年)或1到366(即Le年)开始)。

Example:

例：

// Java program to demonstrate the example
// of getDayOfYear() method of LocalDateTime
import java.time.*;
public class GetDayOfWeekOfLocalDateTime {public static void main(String args[]) {// Instantiates two LocalDateTime
LocalDateTime da_ti1 = LocalDateTime.parse("2005-10-05T10:10:10");
LocalDateTime da_ti2 = LocalDateTime.now();
// Display da_ti1, da_ti2
System.out.println("LocalDateTime da_ti1 and da_ti2: ");
System.out.println("da_ti1: " + da_ti1);
System.out.println("da_ti2: " + da_ti2);
System.out.println();
// Here, this method returns the field value
// day-of-week that is an enum DayOfWeek
// from this date-time object (da_ti1)
DayOfWeek dow = da_ti1.getDayOfWeek();
// Display dow
System.out.println("da_ti1.getDayOfWeek(): " + dow);
// Here, this method returns the field value
// day-of-week that is an enum DayOfWeek
// from this date-time object (da_ti2)
dow = da_ti2.getDayOfWeek();
// Display dow
System.out.println("da_ti2.getDayOfWeek(): " + dow);
}
}

Output

输出量

LocalDateTime da_ti1 and da_ti2:
da_ti1: 2005-10-05T10:10:10
da_ti2: 2020-06-05T02:47:28.362477da_ti1.getDayOfWeek(): WEDNESDAY
da_ti2.getDayOfWeek(): FRIDAY

翻译自: https://www.includehelp.com/java/localdatetime-getdayofyear-method-with-example.aspx