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

All Implemented Interfaces:

java.io.Serializable
```
@Deprecated
public final class ThreadLocalRandom
extends java.util.Random
```
Deprecated.

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 accidentally share a ThreadLocalRandom across multiple threads.
This class also provides additional commonly used bounded random generation methods. //since 1.7 //author Doug Lea

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field	Description
`private static long`	`addend`	Deprecated.
`(package private) boolean`	`initialized`	Deprecated. Initialization flag to permit calls to setSeed to succeed only while executing the Random constructor.
`private static long`	`initialSeedUniquifier`	Deprecated.
`private static InternalLogger`	`logger`	Deprecated.
`private static long`	`mask`	Deprecated.
`private static long`	`multiplier`	Deprecated.
`private long`	`pad0`	Deprecated.
`private long`	`pad1`	Deprecated.
`private long`	`pad2`	Deprecated.
`private long`	`pad3`	Deprecated.
`private long`	`pad4`	Deprecated.
`private long`	`pad5`	Deprecated.
`private long`	`pad6`	Deprecated.
`private long`	`pad7`	Deprecated.
`private long`	`rnd`	Deprecated. The random seed.
`private static long`	`seedGeneratorEndTime`	Deprecated.
`private static long`	`seedGeneratorStartTime`	Deprecated.
`private static java.lang.Thread`	`seedGeneratorThread`	Deprecated.
`private static java.util.concurrent.BlockingQueue<java.lang.Long>`	`seedQueue`	Deprecated.
`private static java.util.concurrent.atomic.AtomicLong`	`seedUniquifier`	Deprecated.
`private static long`	`serialVersionUID`	Deprecated.

Constructor Summary

Constructors
Constructor Description

ThreadLocalRandom()
Deprecated.

Constructor called only by localRandom.initialValue.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method	Description
`static ThreadLocalRandom`	`current()`	Deprecated. Returns the current thread's `ThreadLocalRandom`.
`static long`	`getInitialSeedUniquifier()`	Deprecated.
`private static long`	`mix64(long z)`	Deprecated.
`private static long`	`newSeed()`	Deprecated.
`protected int`	`next(int bits)`	Deprecated.
`double`	`nextDouble(double n)`	Deprecated. Returns a pseudorandom, uniformly distributed `double` value between 0 (inclusive) and the specified value (exclusive).
`double`	`nextDouble(double least, double bound)`	Deprecated. Returns a pseudorandom, uniformly distributed value between the given least value (inclusive) and bound (exclusive).
`int`	`nextInt(int least, int bound)`	Deprecated. Returns a pseudorandom, uniformly distributed value between the given least value (inclusive) and bound (exclusive).
`long`	`nextLong(long n)`	Deprecated. Returns a pseudorandom, uniformly distributed value between 0 (inclusive) and the specified value (exclusive).
`long`	`nextLong(long least, long bound)`	Deprecated. Returns a pseudorandom, uniformly distributed value between the given least value (inclusive) and bound (exclusive).
`static void`	`setInitialSeedUniquifier(long initialSeedUniquifier)`	Deprecated.
`void`	`setSeed(long seed)`	Deprecated. Throws `UnsupportedOperationException`.

Methods inherited from class java.util.Random
doubles, doubles, doubles, doubles, ints, ints, ints, ints, longs, longs, longs, longs, nextBoolean, nextBytes, nextDouble, nextFloat, nextGaussian, nextInt, nextInt, nextLong

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - logger
```
private static final InternalLogger logger
```
    Deprecated.
  - seedUniquifier
```
private static final java.util.concurrent.atomic.AtomicLong seedUniquifier
```
    Deprecated.
  - initialSeedUniquifier
```
private static volatile long initialSeedUniquifier
```
    Deprecated.
  - seedGeneratorThread
```
private static final java.lang.Thread seedGeneratorThread
```
    Deprecated.
  - seedQueue
```
private static final java.util.concurrent.BlockingQueue<java.lang.Long> seedQueue
```
    Deprecated.
  - seedGeneratorStartTime
```
private static final long seedGeneratorStartTime
```
    Deprecated.
  - seedGeneratorEndTime
```
private static volatile long seedGeneratorEndTime
```
    Deprecated.
  - multiplier
```
private static final long multiplier
```
    Deprecated.
    
    See Also:
    
    Constant Field Values
  - addend
```
private static final long addend
```
    Deprecated.
    
    See Also:
    
    Constant Field Values
  - mask
```
private static final long mask
```
    Deprecated.
    
    See Also:
    
    Constant Field Values
  - rnd
```
private long rnd
```
    Deprecated.
    
    The random seed. We can't use super.seed.
  - initialized
```
boolean initialized
```
    Deprecated.
    
    Initialization flag to permit calls to setSeed to succeed only while executing the Random constructor. We can't allow others since it would cause setting seed in one part of a program to unintentionally impact other usages by the thread.
  - pad0
```
private long pad0
```
    Deprecated.
  - pad1
```
private long pad1
```
    Deprecated.
  - pad2
```
private long pad2
```
    Deprecated.
  - pad3
```
private long pad3
```
    Deprecated.
  - pad4
```
private long pad4
```
    Deprecated.
  - pad5
```
private long pad5
```
    Deprecated.
  - pad6
```
private long pad6
```
    Deprecated.
  - pad7
```
private long pad7
```
    Deprecated.
  - serialVersionUID
```
private static final long serialVersionUID
```
    Deprecated.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - ThreadLocalRandom
```
ThreadLocalRandom()
```
    Deprecated.
    
    Constructor called only by localRandom.initialValue.
- Method Detail
  - setInitialSeedUniquifier
```
public static void setInitialSeedUniquifier(long initialSeedUniquifier)
```
    Deprecated.
  - getInitialSeedUniquifier
```
public static long getInitialSeedUniquifier()
```
    Deprecated.
  - newSeed
```
private static long newSeed()
```
    Deprecated.
  - mix64
```
private static long mix64(long z)
```
    Deprecated.
  - current
```
public static ThreadLocalRandom current()
```
    Deprecated.
    
    Returns the current thread's ThreadLocalRandom.
    
    Returns:
    
    the current thread's ThreadLocalRandom
  - setSeed
```
public void setSeed(long seed)
```
    Deprecated.
    
    Throws UnsupportedOperationException. Setting seeds in this generator is not supported.
    
    Overrides:
    
    setSeed in class java.util.Random
    
    Throws:
    
    java.lang.UnsupportedOperationException - always
  - next
```
protected int next(int bits)
```
    Deprecated.
    
    Overrides:
    
    next in class java.util.Random
  - nextInt
```
public int nextInt(int least,
                   int bound)
```
    Deprecated.
    
    Returns a pseudorandom, uniformly distributed value between the given least value (inclusive) and bound (exclusive).
    
    Parameters:
    
    least - the least value returned
    
    bound - the upper bound (exclusive)
    
    Returns:
    
    the next value
    
    Throws:
    
    java.lang.IllegalArgumentException - if least greater than or equal to bound
  - nextLong
```
public long nextLong(long n)
```
    Deprecated.
    
    Returns a pseudorandom, uniformly distributed value between 0 (inclusive) and the specified value (exclusive).
    
    Parameters:
    
    n - the bound on the random number to be returned. Must be positive.
    
    Returns:
    
    the next value
    
    Throws:
    
    java.lang.IllegalArgumentException - if n is not positive
  - nextLong
```
public long nextLong(long least,
                     long bound)
```
    Deprecated.
    
    Returns a pseudorandom, uniformly distributed value between the given least value (inclusive) and bound (exclusive).
    
    Parameters:
    
    least - the least value returned
    
    bound - the upper bound (exclusive)
    
    Returns:
    
    the next value
    
    Throws:
    
    java.lang.IllegalArgumentException - if least greater than or equal to bound
  - nextDouble
```
public double nextDouble(double n)
```
    Deprecated.
    
    Returns a pseudorandom, uniformly distributed double value between 0 (inclusive) and the specified value (exclusive).
    
    Parameters:
    
    n - the bound on the random number to be returned. Must be positive.
    
    Returns:
    
    the next value
    
    Throws:
    
    java.lang.IllegalArgumentException - if n is not positive
  - nextDouble
```
public double nextDouble(double least,
                         double bound)
```
    Deprecated.
    
    Returns a pseudorandom, uniformly distributed value between the given least value (inclusive) and bound (exclusive).
    
    Parameters:
    
    least - the least value returned
    
    bound - the upper bound (exclusive)
    
    Returns:
    
    the next value
    
    Throws:
    
    java.lang.IllegalArgumentException - if least greater than or equal to bound

Class ThreadLocalRandom

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.util.Random

Methods inherited from class java.lang.Object

Field Detail

logger

seedUniquifier

initialSeedUniquifier

seedGeneratorThread

seedQueue

seedGeneratorStartTime

seedGeneratorEndTime

multiplier

addend

mask

rnd

initialized

pad0

pad1

pad2

pad3

pad4

pad5

pad6

pad7

serialVersionUID

Constructor Detail

ThreadLocalRandom

Method Detail

setInitialSeedUniquifier

getInitialSeedUniquifier

newSeed

mix64

current

setSeed

next

nextInt

nextLong

nextLong

nextDouble

nextDouble