Java OffsetDateTime withNano()用法及代碼示例

Java中OffsetDateTime類的withNano()方法返回此OffsetDateTime的副本，該副本具有按參數指定更改的納秒級。

用法:

public OffsetDateTime withNano(int nanoOfSecond)

參數：此方法接受單個參數nanaOfSecond，該參數指定要在結果中設置的納秒，範圍可以從0到999、999、999。

返回值：它基於此日期返回一個OffsetDateTime，並帶有請求的納秒級且不為null。

異常：納秒值無效時，程序將引發DateTimeException。

以下示例程序旨在說明withNano()方法：

程序1:

// Java program to demonstrate the withNano() method 
  
import java.time.OffsetDateTime; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Parses the date1 
        OffsetDateTime date1 
            = OffsetDateTime 
                  .parse( 
                      "2018-12-12T13:30:30+05:00"); 
  
        // Prints dates 
        System.out.println("Date1: " + date1); 
  
        // Changes the nano-of-second 
        System.out.println("Date1 after altering nano-of-second: "
                           + date1.withNano(1000)); 
    } 
}

輸出：

Date1: 2018-12-12T13:30:30+05:00
Date1 after altering nano-of-second: 2018-12-12T13:30:30.000001+05:00

程序2:

// Java program to demonstrate the withNano() method 
  
import java.time.OffsetDateTime; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        try { 
  
            // Parses the date1 
            OffsetDateTime date1 
                = OffsetDateTime 
                      .parse( 
                          "2018-12-12T13:30:30+05:00"); 
  
            // Prints dates 
            System.out.println("Date1: " + date1); 
  
            // Changes the nano-of-second 
            System.out.println("Date1 after altering nano-of-second: "
                               + date1.withNano(1000000000)); 
        } 
        catch (Exception e) { 
            System.out.println("Exception: " + e); 
        } 
    } 
}

輸出：

Date1: 2018-12-12T13:30:30+05:00
Exception: java.time.DateTimeException: 
           Invalid value for NanoOfSecond (valid values 0 - 999999999): 1000000000

參考： https://docs.oracle.com/javase/10/docs/api/java/time/OffsetDateTime.html#withNano(int)

相關用法

注：本文由純淨天空篩選整理自gopaldave大神的英文原創作品 OffsetDateTime withNano() 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。