Java LocalDateTime withDayOfMonth()用法及代码示例

Java中的LocalDateTime类的withDayOfMonth()方法用于获取此LocalDateTime的副本，并将dayOfMonth更改为dayOfMonth，并将其作为参数传递给此方法。此LocalDateTime的其余值保持不变。

用法:

public LocalDateTime withDayOfMonth(int dayOfMonth)

参数：此方法接受单个强制性参数dayOfMonth，该参数指定要在结果LocalDateTime实例中设置的dayOfMonth。该dayOfMonth的值可以在1到31之间。

返回值：该函数返回LocalDateTime实例，其中dayOfMonth更改为dayOfMonth，并作为参数传递给此方法。此LocalDateTime的其余值保持不变。

异常：如果dayOfMonth值无效，该函数将引发DateTimeException。

以下示例程序旨在说明LocalDateTime.withDayOfMonth()方法：

示例1:

// Program to illustrate the withDayOfMonth() 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 dayOfMonth 25 
        System.out.println("New LocalDateTime: "
                           + dt.withDayOfMonth(25)); 
    } 
}

输出：

Original LocalDateTime: 2018-11-30T10:38:27.429
New LocalDateTime: 2018-11-25T10:38:27.429

示例2:

// Program to illustrate the withDayOfMonth() 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 dayOfMonth 1 
        System.out.println("New LocalDateTime: "
                           + dt.withDayOfMonth(1)); 
    } 
}

输出：

Original LocalDateTime: 2015-04-06T10:15:30
New LocalDateTime: 2015-04-01T10:15:30

参考： https://docs.oracle.com/javase/10/docs/api/java/time/LocalDateTime.html#withDayOfMonth(int)

相关用法

注：本文由纯净天空筛选整理自gopaldave大神的英文原创作品 LocalDateTime withDayOfMonth() method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。