Java Duration withNanos(long)方法及示例

java.time包中Duration类的withNanos(long)方法用于获取该持续时间的不可变副本，并将指定的纳秒数作为参数传递。

语法。

public Duration withNanos(long amountOfNanos)

参数。该方法接受一个参数 amountOfNanos，它是纳秒的数量。

返回值。该方法返回一个作为参数传递的纳秒数的持续时间。

异常。如果纳秒数无效，该方法会抛出 DateTimeException。

下面的例子说明了Duration.withNanos()方法。

例子1:

// Java code to illustrate withNanos() method
  
import java.time.Duration;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // Get the amount of nano-seconds
        int amountOfNanos = 30000;
  
        // Duration using parse() method
        Duration duration
            = Duration.parse("P2DT3H4M");
  
        // Get the duration in nano-seconds
        // using withNanos() method
        System.out.println(duration
                               .withNanos(amountOfNanos));
    }
}

输出:

PT51H4M0.00003S

例2:

// Java code to illustrate withNanos() method
  
import java.time.Duration;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // Get the amount of nano-seconds
        int amountOfNanos = 100000;
  
        // Duration using ofHours() method
        Duration duration = Duration.ofHours(5);
  
        // Get the duration in nano-seconds
        // using withNanos() method
        System.out.println(duration
                               .withNanos(amountOfNanos));
    }
}