java.util.concurrent

## Enum TimeUnit

- java.lang.Object
- - java.lang.Enum<TimeUnit>
  - - java.util.concurrent.TimeUnit

- All Implemented Interfaces:
    Serializable, Comparable<TimeUnit>

      public enum TimeUnit
      extends Enum<TimeUnit>

  A `TimeUnit` represents time durations at a given unit of granularity and provides utility methods to convert across units, and to perform timing and delay operations in these units. A `TimeUnit` does not maintain time information, but only helps organize and use time representations that may be maintained separately across various contexts. A nanosecond is defined as one thousandth of a microsecond, a microsecond as one thousandth of a millisecond, a millisecond as one thousandth of a second, a minute as sixty seconds, an hour as sixty minutes, and a day as twenty four hours.

  A `TimeUnit` is mainly used to inform time-based methods how a given timing parameter should be interpreted. For example, the following code will timeout in 50 milliseconds if the `lock` is not available:

        Lock lock = ...;
        if ( lock.tryLock(50L, TimeUnit.MILLISECONDS) ) ...

  while this code will timeout in 50 seconds:

        Lock lock = ...;
        if ( lock.tryLock(50L, TimeUnit.SECONDS) ) ...

  Note however, that there is no guarantee that a particular timeout implementation will be able to notice the passage of time at the same granularity as the given `TimeUnit`.
  Since:
    1.5

- - ### Enum Constant Summary

    Enum Constants
    Enum Constant and Description
    `DAYS`
    `HOURS`
    `MICROSECONDS`
    `MILLISECONDS`
    `MINUTES`
    `NANOSECONDS`
    `SECONDS`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `long` | `convert(long sourceDuration, TimeUnit sourceUnit)` Convert the given time duration in the given unit to this unit.
    `void` | `sleep(long timeout)` Performs a `Thread.sleep` using this unit.
    `void` | `timedJoin(Thread thread, long timeout)` Performs a timed `Thread.join` using this time unit.
    `void` | `timedWait(Object obj, long timeout)` Performs a timed `Object.wait` using this time unit.
    `long` | `toDays(long duration)` Equivalent to `DAYS.convert(duration, this)`.
    `long` | `toHours(long duration)` Equivalent to `HOURS.convert(duration, this)`.
    `long` | `toMicros(long duration)` Equivalent to `MICROSECONDS.convert(duration, this)`.
    `long` | `toMillis(long duration)` Equivalent to `MILLISECONDS.convert(duration, this)`.
    `long` | `toMinutes(long duration)` Equivalent to `MINUTES.convert(duration, this)`.
    `long` | `toNanos(long duration)` Equivalent to `NANOSECONDS.convert(duration, this)`.
    `long` | `toSeconds(long duration)` Equivalent to `SECONDS.convert(duration, this)`.
    `static TimeUnit` | `valueOf(String name)` Returns the enum constant of this type with the specified name.
    `static TimeUnit[]` | `values()` Returns an array containing the constants of this enum type, in the order they are declared.

    - ### Methods inherited from class java.lang.Enum

      `clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf`

    - ### Methods inherited from class java.lang.Object

      `getClass, notify, notifyAll, wait, wait, wait`

- - ### Enum Constant Detail

    - #### NANOSECONDS

          public static final TimeUnit NANOSECONDS

    - #### MICROSECONDS

          public static final TimeUnit MICROSECONDS

    - #### MILLISECONDS

          public static final TimeUnit MILLISECONDS

    - #### SECONDS

          public static final TimeUnit SECONDS

    - #### MINUTES

          public static final TimeUnit MINUTES

    - #### HOURS

          public static final TimeUnit HOURS

    - #### DAYS

          public static final TimeUnit DAYS

  - ### Method Detail

    - #### values

          public static TimeUnit[] values()

      Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

          for (TimeUnit c : TimeUnit.values())
              System.out.println(c);

      Returns:
        an array containing the constants of this enum type, in the order they are declared

    - #### valueOf

          public static TimeUnit valueOf(String name)

      Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
      Parameters:
        `name` - the name of the enum constant to be returned.
      Returns:
        the enum constant with the specified name
      Throws:
        `IllegalArgumentException` - if this enum type has no constant with the specified name
        `NullPointerException` - if the argument is null

    - #### convert

          public long convert(long sourceDuration,
                     TimeUnit sourceUnit)

      Convert the given time duration in the given unit to this unit. Conversions from finer to coarser granularities truncate, so lose precision. For example converting `999` milliseconds to seconds results in `0`. Conversions from coarser to finer granularities with arguments that would numerically overflow saturate to `Long.MIN_VALUE` if negative or `Long.MAX_VALUE` if positive.

      For example, to convert 10 minutes to milliseconds, use: `TimeUnit.MILLISECONDS.convert(10L, TimeUnit.MINUTES)`

      Parameters:
        `sourceDuration` - the time duration in the given `sourceUnit`
        `sourceUnit` - the unit of the `sourceDuration` argument
      Returns:
        the converted duration in this unit, or `Long.MIN_VALUE` if conversion would negatively overflow, or `Long.MAX_VALUE` if it would positively overflow.

    - #### toNanos

          public long toNanos(long duration)

      Equivalent to `NANOSECONDS.convert(duration, this)`.
      Parameters:
        `duration` - the duration
      Returns:
        the converted duration, or `Long.MIN_VALUE` if conversion would negatively overflow, or `Long.MAX_VALUE` if it would positively overflow.
      See Also:
        `convert(long, java.util.concurrent.TimeUnit)`

    - #### toMicros

          public long toMicros(long duration)

      Equivalent to `MICROSECONDS.convert(duration, this)`.
      Parameters:
        `duration` - the duration
      Returns:
        the converted duration, or `Long.MIN_VALUE` if conversion would negatively overflow, or `Long.MAX_VALUE` if it would positively overflow.
      See Also:
        `convert(long, java.util.concurrent.TimeUnit)`

    - #### toMillis

          public long toMillis(long duration)

      Equivalent to `MILLISECONDS.convert(duration, this)`.
      Parameters:
        `duration` - the duration
      Returns:
        the converted duration, or `Long.MIN_VALUE` if conversion would negatively overflow, or `Long.MAX_VALUE` if it would positively overflow.
      See Also:
        `convert(long, java.util.concurrent.TimeUnit)`

    - #### toSeconds

          public long toSeconds(long duration)

      Equivalent to `SECONDS.convert(duration, this)`.
      Parameters:
        `duration` - the duration
      Returns:
        the converted duration, or `Long.MIN_VALUE` if conversion would negatively overflow, or `Long.MAX_VALUE` if it would positively overflow.
      See Also:
        `convert(long, java.util.concurrent.TimeUnit)`

    - #### toMinutes

          public long toMinutes(long duration)

      Equivalent to `MINUTES.convert(duration, this)`.
      Parameters:
        `duration` - the duration
      Returns:
        the converted duration, or `Long.MIN_VALUE` if conversion would negatively overflow, or `Long.MAX_VALUE` if it would positively overflow.
      Since:
        1.6
      See Also:
        `convert(long, java.util.concurrent.TimeUnit)`

    - #### toHours

          public long toHours(long duration)

      Equivalent to `HOURS.convert(duration, this)`.
      Parameters:
        `duration` - the duration
      Returns:
        the converted duration, or `Long.MIN_VALUE` if conversion would negatively overflow, or `Long.MAX_VALUE` if it would positively overflow.
      Since:
        1.6
      See Also:
        `convert(long, java.util.concurrent.TimeUnit)`

    - #### toDays

          public long toDays(long duration)

      Equivalent to `DAYS.convert(duration, this)`.
      Parameters:
        `duration` - the duration
      Returns:
        the converted duration
      Since:
        1.6
      See Also:
        `convert(long, java.util.concurrent.TimeUnit)`

    - #### timedWait

          public void timedWait(Object obj,
                       long timeout)
                         throws InterruptedException

      Performs a timed `Object.wait` using this time unit. This is a convenience method that converts timeout arguments into the form required by the `Object.wait` method.

      For example, you could implement a blocking `poll` method (see `BlockingQueue.poll`) using:

            public synchronized Object poll(long timeout, TimeUnit unit) throws InterruptedException {
              while (empty) {
                unit.timedWait(this, timeout);
                ...
              }
            }

      Parameters:
        `obj` - the object to wait on
        `timeout` - the maximum time to wait. If less than or equal to zero, do not wait at all.
      Throws:
        `InterruptedException` - if interrupted while waiting.
      See Also:
        `Object.wait(long, int)`

    - #### timedJoin

          public void timedJoin(Thread thread,
                       long timeout)
                         throws InterruptedException

      Performs a timed `Thread.join` using this time unit. This is a convenience method that converts time arguments into the form required by the `Thread.join` method.
      Parameters:
        `thread` - the thread to wait for
        `timeout` - the maximum time to wait. If less than or equal to zero, do not wait at all.
      Throws:
        `InterruptedException` - if interrupted while waiting.
      See Also:
        `Thread.join(long, int)`

    - #### sleep

          public void sleep(long timeout)
                     throws InterruptedException

      Performs a `Thread.sleep` using this unit. This is a convenience method that converts time arguments into the form required by the `Thread.sleep` method.
      Parameters:
        `timeout` - the minimum time to sleep. If less than or equal to zero, do not sleep at all.
      Throws:
        `InterruptedException` - if interrupted while sleeping.
      See Also:
        `Thread.sleep(long)`

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