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Java ZonedDateTime minusNanos()用法及代碼示例


ZonedDateTime類的minusNanos()方法用於從此ZonedDateTime中減去納秒數,並在減去後返回ZonedDateTime的副本。此方法在即時時間軸上起作用,並在減去1納秒的時間之前返回1納秒的時間軸。請注意,此方法與幾天,幾個月和幾年使用的方法不同。此實例是不可變的,不受此方法調用的影響。

用法:

public ZonedDateTime minusNanos(long nanoseconds)

參數:此方法接受單個參數納秒,該參數代表要減去的納秒,它可以為負。


返回值:此方法基於此日期時間返回一個ZonedDateTime,並減去納秒。

異常:如果結果超出支持的日期範圍,則此方法將引發DateTimeException。

以下示例程序旨在說明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); 
    } 
}
輸出:

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); 
    } 
}
輸出:

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]

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



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注:本文由純淨天空篩選整理自AmanSingh2210大神的英文原創作品 ZonedDateTime minusNanos() method in Java with Examples。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。