Java OffsetDateTime withDayOfYear()方法及示例

Java OffsetDateTime withDayOfYear()方法及示例

Java中OffsetDateTime类的 withDayOfYear() 方法返回该OffsetDateTime的副本,并按参数中指定的年份-月份进行修改。

语法

public OffsetDateTime withDayOfYear(int dayOfYear)

参数: 该方法接受一个参数 dayOfYear ,指定要在结果中设置的年月日,范围从1到365-366。

返回值: 它返回一个基于该日期的OffsetDateTime,该日期为所要求的年月日,且不为空。

异常 :当年月日值无效或年月日对该特定年份的月份无效时,程序会抛出一个 DateTimeException

以下程序说明了withDayOfYear()方法。

程序1 :

// Java program to demonstrate the withDayOfYear() method
  
import java.time.OffsetDateTime;
import java.time.ZonedDateTime;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // Parses the date1
        OffsetDateTime date1
            = OffsetDateTime
                  .parse(
                      "2018-12-12T13:30:30+05:00");
  
        // Prints dates
        System.out.println("Date1: " + date1);
  
        // Changes the day of year
        System.out.println("Date1 after altering day-of-year: "
                           + date1.withDayOfYear(32));
    }
}

输出。

Date1: 2018-12-12T13:30:30+05:00
Date1 after altering day-of-year: 2018-02-01T13:30:30+05:00

程序2

// Java program to demonstrate the withDayOfYear() method
  
import java.time.OffsetDateTime;
  
public class GFG {
    public static void main(String[] args)
    {
        try {
            // Parses the date1
            OffsetDateTime date1
                = OffsetDateTime
                      .parse(
                          "2018-12-12T13:30:30+05:00");
  
            // Prints dates
            System.out.println("Date1: " + date1);
  
            // Changes the day of year
            System.out.println("Date1 after altering day-of-year: "
                               + date1.withDayOfYear(367));
        }
        catch (Exception e) {
            System.out.println("Exception: " + e);
        }
    }
}

输出。

Date1: 2018-12-12T13:30:30+05:00
Exception: java.time.DateTimeException:
           Invalid value for DayOfYear
           (valid values 1 - 365/366): 367

参考资料 : https://docs.oracle.com/javase/10/docs/api/java/time/OffsetDateTime.html#withDayOfYear(int)

Python教程

Java教程

Web教程

数据库教程

图形图像教程

大数据教程

开发工具教程

计算机教程

Java OffsetDateTime