ThreadLocalRandom (Netty 4.1.109.Final API文档

java.lang.Object
- java.util.Random
- - io.netty.util.internal.ThreadLocalRandom

所有已实现的接口:

java.io.Serializable
```
public final class ThreadLocalRandom
extends java.util.Random
```
A random number generator isolated to the current thread. Like the global Random generator used by the Math class, a ThreadLocalRandom is initialized with an internally generated seed that may not otherwise be modified. When applicable, use of ThreadLocalRandom rather than shared Random objects in concurrent programs will typically encounter much less overhead and contention. Use of ThreadLocalRandom is particularly appropriate when multiple tasks (for example, each a io.netty.util.internal.chmv8.ForkJoinTask) use random numbers in parallel in thread pools.
Usages of this class should typically be of the form: ThreadLocalRandom.current().nextX(...) (where X is Int, Long, etc). When all usages are of this form, it is never possible to accidently share a ThreadLocalRandom across multiple threads.
This class also provides additional commonly used bounded random generation methods. //since 1.7 //author Doug Lea

另请参阅:

序列化表格

方法概要

All Methods Static Methods Instance Methods Concrete Methods
限定符和类型	方法和说明
`static ThreadLocalRandom`	`current()` Returns the current thread's `ThreadLocalRandom`.
`static long`	`getInitialSeedUniquifier()`
`protected int`	`next(int bits)`
`double`	`nextDouble(double n)` Returns a pseudorandom, uniformly distributed `double` value between 0 (inclusive) and the specified value (exclusive).
`double`	`nextDouble(double least, double bound)` Returns a pseudorandom, uniformly distributed value between the given least value (inclusive) and bound (exclusive).
`int`	`nextInt(int least, int bound)` Returns a pseudorandom, uniformly distributed value between the given least value (inclusive) and bound (exclusive).
`long`	`nextLong(long n)` Returns a pseudorandom, uniformly distributed value between 0 (inclusive) and the specified value (exclusive).
`long`	`nextLong(long least, long bound)` Returns a pseudorandom, uniformly distributed value between the given least value (inclusive) and bound (exclusive).
`static void`	`setInitialSeedUniquifier(long initialSeedUniquifier)`
`void`	`setSeed(long seed)` Throws `UnsupportedOperationException`.

从类继承的方法 java.util.Random
doubles, doubles, doubles, doubles, ints, ints, ints, ints, longs, longs, longs, longs, nextBoolean, nextBytes, nextDouble, nextFloat, nextGaussian, nextInt, nextInt, nextLong

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 方法详细资料
  - setInitialSeedUniquifier
```
public static void setInitialSeedUniquifier(long initialSeedUniquifier)
```
  - getInitialSeedUniquifier
```
public static long getInitialSeedUniquifier()
```
  - current
```
public static ThreadLocalRandom current()
```
    Returns the current thread's ThreadLocalRandom.
    
    返回:
    
    the current thread's ThreadLocalRandom
  - setSeed
```
public void setSeed(long seed)
```
    Throws UnsupportedOperationException. Setting seeds in this generator is not supported.
    
    覆盖:
    
    setSeed 在类中 java.util.Random
    
    抛出:
    
    java.lang.UnsupportedOperationException - always
  - next
```
protected int next(int bits)
```
    覆盖:
    
    next 在类中 java.util.Random
  - nextInt
```
public int nextInt(int least,
                   int bound)
```
    Returns a pseudorandom, uniformly distributed value between the given least value (inclusive) and bound (exclusive).
    
    参数:
    
    least - the least value returned
    
    bound - the upper bound (exclusive)
    
    返回:
    
    the next value
    
    抛出:
    
    java.lang.IllegalArgumentException - if least greater than or equal to bound
  - nextLong
```
public long nextLong(long n)
```
    Returns a pseudorandom, uniformly distributed value between 0 (inclusive) and the specified value (exclusive).
    
    参数:
    
    n - the bound on the random number to be returned. Must be positive.
    
    返回:
    
    the next value
    
    抛出:
    
    java.lang.IllegalArgumentException - if n is not positive
  - nextLong
```
public long nextLong(long least,
                     long bound)
```
    Returns a pseudorandom, uniformly distributed value between the given least value (inclusive) and bound (exclusive).
    
    参数:
    
    least - the least value returned
    
    bound - the upper bound (exclusive)
    
    返回:
    
    the next value
    
    抛出:
    
    java.lang.IllegalArgumentException - if least greater than or equal to bound
  - nextDouble
```
public double nextDouble(double n)
```
    Returns a pseudorandom, uniformly distributed double value between 0 (inclusive) and the specified value (exclusive).
    
    参数:
    
    n - the bound on the random number to be returned. Must be positive.
    
    返回:
    
    the next value
    
    抛出:
    
    java.lang.IllegalArgumentException - if n is not positive
  - nextDouble
```
public double nextDouble(double least,
                         double bound)
```
    Returns a pseudorandom, uniformly distributed value between the given least value (inclusive) and bound (exclusive).
    
    参数:
    
    least - the least value returned
    
    bound - the upper bound (exclusive)
    
    返回:
    
    the next value
    
    抛出:
    
    java.lang.IllegalArgumentException - if least greater than or equal to bound

类 ThreadLocalRandom

方法概要

从类继承的方法 java.util.Random

从类继承的方法 java.lang.Object

方法详细资料

setInitialSeedUniquifier

getInitialSeedUniquifier

current

setSeed

next

nextInt

nextLong

nextLong

nextDouble

nextDouble