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Java ZonedDateTime withHour()用法及代码示例


ZonedDateTime类的withHour()方法用于更改此ZonedDateTime中的hour-of-day,并在此操作后返回ZonedDateTime的副本。此方法在本地时间线上操作,更改本地日期时间和此操作之后的本地日期时间使用区域ID获取偏移量,将其转换回ZonedDateTime。当转换回ZonedDateTime时,如果本地日期时间重叠,则将尽可能保留偏移量,否则将使用较早的偏移量。此实例是不可变的,不受此方法调用的影响。

用法:

public ZonedDateTime withHour(int hour)

参数:此方法接受单个参数小时,该小时代表要在结果中设置的hour-of-day,范围为0到23。


返回值:此方法基于此日期时间和所请求的小时返回ZonedDateTime。

异常:如果小时值无效,则此方法引发DateTimeException。

以下示例程序旨在说明withHour()方法:
示例1:

// Java program to demonstrate 
// ZonedDateTime.withHour() method 
  
import java.time.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create a ZonedDateTime object 
        ZonedDateTime zoneddatetime 
            = ZonedDateTime.parse( 
                "2018-12-06T19:21:12.123+05:30[Asia/Calcutta]"); 
  
        // print instance 
        System.out.println("ZonedDateTime before"
                           + " alter hour: "
                           + zoneddatetime); 
  
        // alter hour to 20 
        ZonedDateTime returnvalue 
            = zoneddatetime.withHour(20); 
  
        // print result 
        System.out.println("ZonedDateTime after "
                           + "alter hour: "
                           + returnvalue); 
    } 
}
输出:

ZonedDateTime before alter hour: 2018-12-06T19:21:12.123+05:30[Asia/Calcutta]
ZonedDateTime after alter hour: 2018-12-06T20:21:12.123+05:30[Asia/Calcutta]

示例2:

// Java program to demonstrate 
// ZonedDateTime.withHour() method 
  
import java.time.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create a ZonedDateTime object 
        ZonedDateTime zoneddatetime 
            = ZonedDateTime.parse( 
                "2018-10-25T23:12:31.123+02:00[Europe/Paris]"); 
  
        // print instance 
        System.out.println("ZonedDateTime before"
                           + " alter hour: "
                           + zoneddatetime); 
  
        // alter hour to 0 
        ZonedDateTime returnvalue 
            = zoneddatetime.withHour(0); 
  
        // print result 
        System.out.println("ZonedDateTime after "
                           + "alter hour: "
                           + returnvalue); 
    } 
}
输出:

ZonedDateTime before alter hour: 2018-10-25T23:12:31.123+02:00[Europe/Paris]
ZonedDateTime after alter hour: 2018-10-25T00:12:31.123+02:00[Europe/Paris]

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



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注:本文由纯净天空筛选整理自AmanSingh2210大神的英文原创作品 ZonedDateTime 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。