Java 中的 TimeUnit toMillis()方法，带示例

原文:https://www . geesforgeks . org/time unit-tomi llis-method-in-Java-with-examples/

时间单位类的Tomilis()方法用于获取从 1970 年 1 月 1 日午夜协调世界时开始，由时间单位对象表示的时间，以秒为单位。

语法:

public long toMillis(long duration)

参数:该方法接受一个强制参数持续时间，即以毫秒为单位的持续时间。

返回值:该方法将转换后的时长返回为秒。

下面的程序说明了 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));
    }
}

Output:

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));
    }
}

Output:

Time 1539585759 Seconds in MilliSeconds = 1539585759000

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