Java ZonedDateTime minusNanos()用法及代码示例

ZonedDateTime类的minusNanos()方法用于从此ZonedDateTime中减去纳秒数，并在减去后返回ZonedDateTime的副本。此方法在即时时间轴上起作用，并在减去1纳秒的时间之前返回1纳秒的时间轴。请注意，此方法与几天，几个月和几年使用的方法不同。此实例是不可变的，不受此方法调用的影响。

用法:

public ZonedDateTime minusNanos(long nanoseconds)

参数：此方法接受单个参数纳秒，该参数代表要减去的纳秒，它可以为负。

返回值：此方法基于此日期时间返回一个ZonedDateTime，并减去纳秒。

异常：如果结果超出支持的日期范围，则此方法将引发DateTimeException。

以下示例程序旨在说明minusNanos()方法：
示例1:

// Java program to demonstrate 
// ZonedDateTime.minusNanos() 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"
                           + " subtracting nanoseconds: "
                           + zoneddatetime); 
  
        // subtract 30000000 nanoseconds 
        ZonedDateTime returnvalue 
            = zoneddatetime.minusNanos(30000000); 
  
        // print result 
        System.out.println("ZonedDateTime after "
                           + " subtracting 30000000 nanoseconds: "
                           + returnvalue); 
    } 
}

输出：

ZonedDateTime before subtracting nanoseconds: 2018-12-06T19:21:12.123+05:30[Asia/Calcutta]
ZonedDateTime after subtracting 30000000 nanoseconds: 2018-12-06T19:21:12.093+05:30[Asia/Calcutta]

示例2:

// Java program to demonstrate 
// ZonedDateTime.minusNanos() 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"
                           + " subtracting nanoseconds: "
                           + zoneddatetime); 
  
        // subtract 52000000 nanoseconds 
        ZonedDateTime returnvalue 
            = zoneddatetime.minusNanos(52000000); 
  
        // print result 
        System.out.println("ZonedDateTime after "
                           + " subtracting 52000000 nanoseconds: "
                           + returnvalue); 
    } 
}

输出：

ZonedDateTime before subtracting nanoseconds: 2018-10-25T23:12:31.123+02:00[Europe/Paris]
ZonedDateTime after subtracting 52000000 nanoseconds: 2018-10-25T23:12:31.071+02:00[Europe/Paris]

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

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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 minusNanos() 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。