Java中的 TimeUnit toMillis() 方法及示例

TimeUnit 类的toMillis()方法用于获取 TimeUnit 对象表示的时间，以秒数表示，自 1970 年 1 月 1 日午夜 UTC 起。

句法：

public long toMillis(long duration)

参数：此方法接受一个强制参数duration ，它是以毫秒为单位的持续时间。

返回值：此方法将转换后的持续时间返回为秒。

下面的程序说明了 TimeUnit toMillis() 方法的实现：

方案一：

// Java program to demonstrate
// toMillis() method of TimeUnit Class
  
import java.util.concurrent.*;
import java.util.Date;
  
class GFG {
    public static void main(String args[])
    {
        // Get current time in seconds
        long timeInSec = (new Date().getTime()) / 1000;
  
        // Create a TimeUnit object
        TimeUnit time = TimeUnit.SECONDS;
  
        // Convert seconds to milliSeconds
        // using toMillis() method
        System.out.println("Time " + timeInSec
                           + " Seconds in MilliSeconds = "
                           + time.toMillis(timeInSec));
    }
}

输出：

Time 1539585757 Seconds in MilliSeconds = 1539585757000

方案二：

// Java program to demonstrate
// toMillis() 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 timeInSec = (Calendar
                              .getInstance()
                              .getTimeInMillis())
                         / 1000;
  
        // Create a TimeUnit object
        TimeUnit time = TimeUnit.SECONDS;
  
        // Convert seconds to milliSeconds
        // using toMillis() method
        System.out.println("Time " + timeInSec
                           + " Seconds in MilliSeconds = "
                           + time.toMillis(timeInSec));
    }
}

输出：

Time 1539585759 Seconds in MilliSeconds = 1539585759000