Java TimeUnit convert()方法及示例

TimeUnit类的convert()方法用于将给定单位中的时间长度转换为该单位。由于转换涉及从大单位到小单位或从小单位到大单位，因此在使用该方法时可能会出现精度损失和溢出。

语法。

public long convert(long sourceDuration,                         TimeUnit sourceUnit)

参数。这个方法接受两个强制性参数。

返回值。这个方法返回这个单位的转换后的持续时间，如果转换会出现负溢出，则返回Long.MIN_VALUE，如果会出现正溢出，则返回Long.MAX_VALUE。

以下程序说明了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));    }}

输出:

Time 55 minutes in milliSeconds = 3300000

程序2：将秒转换为分

// 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));    }}

输出:

Time 300 seconds in minutes = 5