Java 中的 TimeUnit convert()方法，示例

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

时间单位类的 convert() 方法用于将给定单位的给定持续时间转换为该单位。由于转换涉及从较大到较小或从较小到较大的单位，因此在使用这种方法时会出现精度损失和溢出。

语法:

public long convert(long sourceDuration, 
                        TimeUnit sourceUnit)

参数:该方法接受两个强制参数:

  • 源持续时间–给定源单位的持续时间
  • 源单位–源持续时间参数的单位

返回值:此方法返回本单位的换算时长，或龙。如果转换会负溢出，则为最小值，否则为长值。最大值，如果它肯定会溢出。

下面的程序说明了 TimeUnit convert()方法的实现:

程序 1: 将分钟转换为毫秒

// Java program to demonstrate
// convert() method of TimeUnit Class

import java.util.concurrent.*;
import java.util.Date;

class GFG {
    public static void main(String args[])
    {
        // Get time to be converted in Minutes
        long timeInMinutes = 55L;

        // Create a TimeUnit object
        TimeUnit time = TimeUnit.MILLISECONDS;

        // Convert Minutes to milliseconds
        // using convert() method
        System.out.println("Time " + timeInMinutes
                           + " minutes in milliSeconds = "
                           + time.convert(timeInMinutes,
                                          TimeUnit.MINUTES));
    }
}

Output:

Time 55 minutes in milliSeconds = 3300000

程序 2: 将秒转换为分钟

// Java program to demonstrate
// convert() method of TimeUnit Class

import java.util.concurrent.*;
import java.util.Date;

class GFG {
    public static void main(String args[])
    {
        // Get time to be converted in Seconds
        long timeInSec = 300L;

        // Create a TimeUnit object
        TimeUnit time = TimeUnit.MINUTES;

        // Convert Seconds to Minutes
        // using convert() method
        System.out.println("Time " + timeInSec
                           + " seconds in minutes = "
                           + time.convert(timeInSec,
                                          TimeUnit.SECONDS));
    }
}

Output:

Time 300 seconds in minutes = 5

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