TimeUnit

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

所有已实现的接口:

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.
从以下版本开始:

1.5

枚举常量概要

枚举常量
枚举常量	说明
`DAYS`	Time unit representing twenty four hours
`HOURS`	Time unit representing sixty minutes
`MICROSECONDS`	Time unit representing one thousandth of a millisecond
`MILLISECONDS`	Time unit representing one thousandth of a second
`MINUTES`	Time unit representing sixty seconds
`NANOSECONDS`	Time unit representing one thousandth of a microsecond
`SECONDS`	Time unit representing one second

方法概要

所有方法静态方法实例方法具体方法
限定符和类型	方法	说明
`long`	`convert(long sourceDuration, TimeUnit sourceUnit)`	Converts the given time duration in the given unit to this unit.
`void`	`sleep(long timeout)`	Performs a `Thread#sleep(long, int)` using this time unit.
`void`	`timedJoin(Thread thread, long timeout)`	Performs a timed `Thread#join(long, int)` using this time unit.
`void`	`timedWait(Object obj, long timeout)`	Performs a timed `Object#wait(long, int)` 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)`	返回带有指定名称的该类型的枚举常量。字符串必须与用于声明该类型的枚举常量的标识符完全匹配。(不允许有多余的空格字符。)
`static TimeUnit[]`	`values()`	按照声明该枚举类型的常量的顺序, 返回包含这些常量的数组。该方法可用于迭代常量, 如下所示: for (TimeUnit c : TimeUnit.values()) System.out.println(c);

从类继承的方法 java.lang.Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

从类继承的方法 java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

- 枚举常量详细资料
  - NANOSECONDS
```
public static final TimeUnit NANOSECONDS
```
    Time unit representing one thousandth of a microsecond
  - MICROSECONDS
```
public static final TimeUnit MICROSECONDS
```
    Time unit representing one thousandth of a millisecond
  - MILLISECONDS
```
public static final TimeUnit MILLISECONDS
```
    Time unit representing one thousandth of a second
  - SECONDS
```
public static final TimeUnit SECONDS
```
    Time unit representing one second
  - MINUTES
```
public static final TimeUnit MINUTES
```
    Time unit representing sixty seconds
  - HOURS
```
public static final TimeUnit HOURS
```
    Time unit representing sixty minutes
  - DAYS
```
public static final TimeUnit DAYS
```
    Time unit representing twenty four hours
- 方法详细资料
  - values
```
public static TimeUnit[] values()
```
    按照声明该枚举类型的常量的顺序, 返回包含这些常量的数组。该方法可用于迭代常量, 如下所示:
```
for (TimeUnit c : TimeUnit.values())
    System.out.println(c);
```
    返回:
    
    按照声明该枚举类型的常量的顺序返回的包含这些常量的数组
  - valueOf
```
public static TimeUnit valueOf(String name)
```
    返回带有指定名称的该类型的枚举常量。字符串必须与用于声明该类型的枚举常量的标识符完全匹配。(不允许有多余的空格字符。)
    
    参数:
    
    name - 要返回的枚举常量的名称。
    
    返回:
    
    返回带有指定名称的枚举常量
    
    抛出:
    
    IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量
    
    NullPointerException - 如果参数为空值
  - convert
```
public long convert(long sourceDuration,
                    TimeUnit sourceUnit)
```
    Converts 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)
    
    参数:
    
    sourceDuration - the time duration in the given sourceUnit
    
    sourceUnit - the unit of the sourceDuration argument
    
    返回:
    
    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).
    
    参数:
    
    duration - the duration
    
    返回:
    
    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).
    
    参数:
    
    duration - the duration
    
    返回:
    
    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).
    
    参数:
    
    duration - the duration
    
    返回:
    
    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).
    
    参数:
    
    duration - the duration
    
    返回:
    
    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).
    
    参数:
    
    duration - the duration
    
    返回:
    
    the converted duration, or Long.MIN_VALUE if conversion would negatively overflow, or Long.MAX_VALUE if it would positively overflow.
    
    从以下版本开始:
    
    1.6
  - toHours
```
public long toHours(long duration)
```
    Equivalent to HOURS.convert(duration, this).
    
    参数:
    
    duration - the duration
    
    返回:
    
    the converted duration, or Long.MIN_VALUE if conversion would negatively overflow, or Long.MAX_VALUE if it would positively overflow.
    
    从以下版本开始:
    
    1.6
  - toDays
```
public long toDays(long duration)
```
    Equivalent to DAYS.convert(duration, this).
    
    参数:
    
    duration - the duration
    
    返回:
    
    the converted duration
    
    从以下版本开始:
    
    1.6
  - timedWait
```
public void timedWait(Object obj,
                      long timeout)
               throws InterruptedException
```
    Performs a timed Object#wait(long, int) 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);
     ...
   }
 }
```
    参数:
    
    obj - the object to wait on
    
    timeout - the maximum time to wait. If less than or equal to zero, do not wait at all.
    
    抛出:
    
    InterruptedException - if interrupted while waiting
  - timedJoin
```
public void timedJoin(Thread thread,
                      long timeout)
               throws InterruptedException
```
    Performs a timed Thread#join(long, int) using this time unit. This is a convenience method that converts time arguments into the form required by the Thread.join method.
    
    参数:
    
    thread - the thread to wait for
    
    timeout - the maximum time to wait. If less than or equal to zero, do not wait at all.
    
    抛出:
    
    InterruptedException - if interrupted while waiting
  - sleep
```
public void sleep(long timeout)
           throws InterruptedException
```
    Performs a Thread#sleep(long, int) using this time unit. This is a convenience method that converts time arguments into the form required by the Thread.sleep method.
    
    参数:
    
    timeout - the minimum time to sleep. If less than or equal to zero, do not sleep at all.
    
    抛出:
    
    InterruptedException - if interrupted while sleeping

枚举 TimeUnit

枚举常量概要

方法概要

从类继承的方法 java.lang.Enum

从类继承的方法 java.lang.Object

枚举常量详细资料

NANOSECONDS

MICROSECONDS

MILLISECONDS

SECONDS

MINUTES

HOURS

DAYS

方法详细资料

values

valueOf

convert

toNanos

toMicros

toMillis

toSeconds

toMinutes

toHours

toDays

timedWait

timedJoin

sleep