Java TimeUnit toNanos()用法及代码示例

从1970年1月1日午夜UTC开始，使用TimeUnit类的toNanos()方法获取TimeUnit对象表示的时间(以NanoSeconds的形式表示)。

用法:

public long toNanos(long duration)

参数：此方法接受强制参数持续时间，该持续时间以毫秒为单位。

返回值：此方法将转换后的持续时间返回为NanoSeconds。

下面的程序演示了TimeUnit toNanos()方法的实现：

示例1:

// Java program to demonstrate 
// toNanos() method of TimeUnit Class 
  
import java.util.concurrent.*; 
import java.util.Date; 
  
class GFG { 
    public static void main(String args[]) 
    { 
        // Get current time in milliseconds 
        long timeInMilliSec = new Date().getTime(); 
  
        // Create a TimeUnit object 
        TimeUnit time = TimeUnit.MILLISECONDS; 
  
        // Convert milliseconds to NanoSeconds 
        // using toNanos() method 
        System.out.println("Time " + timeInMilliSec 
                           + " milliSeconds in NanoSeconds = "
                           + time.toNanos(timeInMilliSec)); 
    } 
}

输出：

Time 1539585501608 milliSeconds in NanoSeconds = 1539585501608000000

示例2:

// Java program to demonstrate 
// toNanos() method of TimeUnit Class 
  
import java.util.concurrent.*; 
import java.util.Calendar; 
  
class GFG { 
    public static void main(String args[]) 
    { 
        // Get current time in milliseconds 
        long timeInMilliSec = Calendar 
                                  .getInstance() 
                                  .getTimeInMillis(); 
  
        // Create a TimeUnit object 
        TimeUnit time = TimeUnit.MILLISECONDS; 
  
        // Convert milliseconds to NanoSeconds 
        // using toNanos() method 
        System.out.println("Time " + timeInMilliSec 
                           + " milliSeconds in NanoSeconds = "
                           + time.toNanos(timeInMilliSec)); 
    } 
}

输出：

Time 1539585503771 milliSeconds in NanoSeconds = 1539585503771000000

相关用法

注：本文由纯净天空筛选整理自RishabhPrabhu大神的英文原创作品 TimeUnit toNanos() 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。