Java TimeUnit toMillis()方法及示例

TimeUnit类 的 toMillis() 方法用于获取TimeUnit对象所代表的时间，作为1970年1月1日UTC午夜后的秒数。

语法

public long toMillis(long duration)

参数： 该方法接受一个强制性参数 duration ，它是以毫秒为单位的持续时间。
返回值： 该方法返回 转换后的持续时间 为Seconds。以下程序说明了TimeUnit toMillis()方法的实现：

程序1 :

// 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

程序2 。

// 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