Java中的 LocalDateTime withDayOfYear() 方法及示例
Java中LocalDateTime 类的withDayOfYear()方法用于获取此 LocalDateTime 的副本,其中 dayOfYear 更改为 dayOfYear 作为参数传递给该方法。此 LocalDateTime 的其余值保持不变。
句法:
public LocalDateTime withDayOfYear(int dayOfYear)
参数:此方法接受一个强制参数dayOfYear ,它指定要在结果 LocalDateTime 实例中设置的 dayOfYear。这个 dayOfYear 的值可以在 1 到 366 之间。
返回:该函数返回一个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 。
下面的程序说明了 LocalDateTime.withDayOfYear() 方法:
方案一:
// 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
方案二:
// 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: https: Java/time/LocalDateTime.html#withDayOfYear(int)