java.util.concurrent
enum TimeUnit

java.lang.Object java.lang.Enum java.util.concurrent.TimeUnit

All Implemented Interfaces:

Serializable, Comparable

public enum TimeUnit
extends Enum

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 {@link java.util.concurrent.locks.Lock lock} is not available:

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

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

DAYS

public static final TimeUnit DAYS

HOURS

public static final TimeUnit HOURS

MICROSECONDS

public static final TimeUnit MICROSECONDS

MILLISECONDS

public static final TimeUnit MILLISECONDS

MINUTES

public static final TimeUnit MINUTES

NANOSECONDS

public static final TimeUnit NANOSECONDS

SECONDS

public static final TimeUnit SECONDS

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.

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.

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.

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 {@link BlockingQueue#poll 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.

toDays

public long toDays(long duration)

Equivalent to DAYS.convert(duration, this).

Parameters:

duration - the duration

Returns:

the converted duration

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.

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.

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.

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.

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.

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.

valueOf

public static TimeUnit valueOf(String name)

Parameters:

name

values

public static TimeUnit[] values()