Java LocalDateTime withNano()用法及代碼示例

Java中的LocalDateTime類的withNano()方法用於獲取此LocalDateTime的副本，並將納秒更改為作為此方法的參數傳遞的納秒。此LocalDateTime的其餘值保持不變。

用法:

public LocalDateTime withNano(int nanoSeconds)

參數：此方法接受單個強製性參數nanoSeconds，該參數指定要在結果LocalDateTime實例中設置的納秒。此納秒的值的範圍可以從0到999999999。

返回值：該函數返回LocalDateTime實例，該實例的納秒更改為作為此方法的參數傳遞的納秒。此LocalDateTime的其餘值保持不變。

異常：如果納秒值無效，該函數將引發DateTimeException。

以下示例程序旨在說明LocalDateTime.withNano()方法：

示例1:

// Program to illustrate the withNano() 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 nano-seconds 0 
        System.out.println("New LocalDateTime: "
                           + dt.withNano(0)); 
    } 
}

輸出：

Original LocalDateTime: 2018-11-30T12:54:17.484
New LocalDateTime: 2018-11-30T12:54:17

示例2:

// Program to illustrate the withNano() 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 nano-seconds 99999 
        System.out.println("New LocalDateTime: "
                           + dt.withNano(99999)); 
    } 
}

輸出：

Original LocalDateTime: 2015-04-06T10:15:30
New LocalDateTime: 2015-04-06T10:15:30.000099999

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

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