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| java.lang.Object | ||
| ↳ | java.util.Random | |
| ↳ | java.util.concurrent.ThreadLocalRandom | |
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 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.
| Public Methods | |||||||||||
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Returns the current thread's
ThreadLocalRandom.
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Returns a pseudorandom, uniformly distributed
double value
between 0 (inclusive) and the specified value (exclusive).
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Returns a pseudorandom, uniformly distributed value between the
given least value (inclusive) and bound (exclusive).
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Returns a pseudorandom, uniformly distributed value between the
given least value (inclusive) and bound (exclusive).
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Returns a pseudorandom, uniformly distributed value
between 0 (inclusive) and the specified value (exclusive).
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Returns a pseudorandom, uniformly distributed value between the
given least value (inclusive) and bound (exclusive).
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Throws
UnsupportedOperationException.
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| Protected Methods | |||||||||||
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Returns a pseudo-random uniformly distributed
int value of
the number of bits specified by the argument bits as
described by Donald E.
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[Expand]
Inherited Methods | |||||||||||
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From class
java.util.Random
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From class
java.lang.Object
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Returns the current thread's ThreadLocalRandom.
ThreadLocalRandom
Returns a pseudorandom, uniformly distributed double value
between 0 (inclusive) and the specified value (exclusive).
| n | the bound on the random number to be returned. Must be positive. |
|---|
| IllegalArgumentException | if n is not positive |
|---|
Returns a pseudorandom, uniformly distributed value between the given least value (inclusive) and bound (exclusive).
| least | the least value returned |
|---|---|
| bound | the upper bound (exclusive) |
| IllegalArgumentException | if least greater than or equal to bound |
|---|
Returns a pseudorandom, uniformly distributed value between the given least value (inclusive) and bound (exclusive).
| least | the least value returned |
|---|---|
| bound | the upper bound (exclusive) |
| IllegalArgumentException | if least greater than or equal to bound |
|---|
Returns a pseudorandom, uniformly distributed value between 0 (inclusive) and the specified value (exclusive).
| n | the bound on the random number to be returned. Must be positive. |
|---|
| IllegalArgumentException | if n is not positive |
|---|
Returns a pseudorandom, uniformly distributed value between the given least value (inclusive) and bound (exclusive).
| least | the least value returned |
|---|---|
| bound | the upper bound (exclusive) |
| IllegalArgumentException | if least greater than or equal to bound |
|---|
Throws UnsupportedOperationException. Setting seeds in
this generator is not supported.
| UnsupportedOperationException | always |
|---|
Returns a pseudo-random uniformly distributed int value of
the number of bits specified by the argument bits as
described by Donald E. Knuth in The Art of Computer Programming,
Volume 2: Seminumerical Algorithms, section 3.2.1.
Most applications will want to use one of this class' convenience methods instead.
Subclasses only need to override this method to alter the behavior of all the public methods.