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📜  Java中的 LocalDateTime withDayOfYear() 方法及示例

📅  最后修改于: 2022-05-13 01:55:25.268000             🧑  作者: Mango

Java中的 LocalDateTime withDayOfYear() 方法及示例

Java中LocalDateTime 类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)