Java中的LocalDateTime类的withDayOfYear()方法用于获取此LocalDateTime的副本,并将dayOfYear更改为dayOfYear作为参数传递给此方法。此LocalDateTime的其余值保持不变。
用法:
public LocalDateTime withDayOfYear(int dayOfYear)
参数:此方法接受单个强制性参数dayOfYear,该参数指定要在结果LocalDateTime实例中设置的dayOfYear。该dayOfYear的值可以在1到366之间。
返回值:该函数返回LocalDateTime实例,其中dayOfYear更改为dayOfYear作为参数传递给此方法。此LocalDateTime的其余值保持不变。
异常:如果dayOfYear值无效,该函数将引发DateTimeException。
以下示例程序旨在说明LocalDateTime.withDayOfYear()方法:
示例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
示例2:
// 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: https://docs.oracle.com/javase/10/docs/api/java/time/LocalDateTime.html#withDayOfYear(int)
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