Java LocalDateTime withHour()用法及代码示例

Java中的LocalDateTime类的withHour()方法用于获取此LocalDateTime的副本，并将小时数更改为作为此方法的参数传递的小时数。此LocalDateTime的其余值保持不变。

用法:

public LocalDateTime withHour(int hours)

参数：此方法接受单个强制性参数hours，该参数指定要在结果LocalDateTime实例中设置的小时数。该小时数的范围是0到23。

返回值：该函数返回LocalDateTime实例，并将小时数更改为作为此方法的参数传递的小时数。此LocalDateTime的其余值保持不变。

异常：如果小时值无效，则该函数将引发DateTimeException。

以下示例程序旨在说明LocalDateTime.withHour()方法：

示例1:

// Program to illustrate the withHour() 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 hours 0 
        System.out.println("New LocalDateTime: "
                           + dt.withHour(0)); 
    } 
}

输出：

Original LocalDateTime: 2018-11-30T12:53:06.591
New LocalDateTime: 2018-11-30T00:53:06.591

示例2:

// Program to illustrate the withHour() 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 hours 20 
        System.out.println("New LocalDateTime: "
                           + dt.withHour(20)); 
    } 
}

输出：

Original LocalDateTime: 2015-04-06T10:15:30
New LocalDateTime: 2015-04-06T20:15:30

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

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注：本文由纯净天空筛选整理自gopaldave大神的英文原创作品 LocalDateTime withHour() 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。