Java 中带有 DayOfYear()方法的 LocalDateTime，示例

原文:https://www . geesforgeks . org/local datetime-with dayof year-in-Java-method-with-examples/

Java 中 LocalDateTime 类的 withDayOfYear() 方法用于获取该 LocalDateTime 的副本，DayOfYear 被更改为 dayOfYear，并作为参数传递给该方法。该本地日期时间的其余值保持不变。

语法:

public LocalDateTime withDayOfYear(int dayOfYear)

参数:该方法接受一个强制参数day fyear，该参数指定要在结果本地日期时间实例中设置的 day fyear。该日期的值可以从 1 到 366。

返回:该函数返回一个本地日期时间实例，其中 dayOfYear 被更改为 dayOfYear，并作为参数传递给该方法。该本地日期时间的其余值保持不变。

异常:如果 dayOfYear 值无效，函数抛出日期时间异常。

下面的程序说明了 LocalDateTime.withDayOfYear()方法:

程序 1:

// Program to illustrate the withDayOfYear() method

import java.util.*;
import java.time.*;

public class GfG {
    public static void main(String[] args)
    {
        // Get the LocalDateTime instance
        LocalDateTime dt = LocalDateTime.now();

        // Get the String representation of this LocalDateTime
        System.out.println("Original LocalDateTime: "
                           + dt.toString());

        // Get a new LocalDateTime with dayOfYear 1
        System.out.println("New LocalDateTime: "
                           + dt.withDayOfYear(1));
    }
}

输出:

Original LocalDateTime: 2018-11-30T12:54:35.320
New LocalDateTime: 2018-01-01T12:54:35.320

程序二:

// Program to illustrate the withDayOfYear() method

import java.util.*;
import java.time.*;

public class GfG {
    public static void main(String[] args)
    {
        // Get the LocalDateTime instance
        LocalDateTime dt
            = LocalDateTime
                  .parse("2015-04-06T10:15:30");

        // Get the String representation of this LocalDateTime
        System.out.println("Original LocalDateTime: "
                           + dt.toString());

        // Get a new LocalDateTime with dayOfYear 365
        System.out.println("New LocalDateTime: "
                           + dt.withDayOfYear(365));
    }
}

输出:

Original LocalDateTime: 2015-04-06T10:15:30
New LocalDateTime: 2015-12-31T10:15:30

参考:T2【https://docs . Oracle . com/javase/10/docs/API/Java/time/local datetime . html # withDayOfYear(int)

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