SplittableRandom

public final class SplittableRandom
extends Object

一个统一的伪随机值生成器，适用于（在其他上下文中）用于隔离的并行计算，这些计算可能会生成子任务。 类SplittableRandom支持方法用于生产类型的伪随机数int ， long和double具有类似用途作为类Random但在以下方面不同：

• Series of generated values pass the DieHarder suite testing independence and uniformity properties of random number generators. (Most recently validated with version 3.31.1.) These tests validate only the methods for certain types and ranges, but similar properties are expected to hold, at least approximately, for others as well. The period (length of any series of generated values before it repeats) is at least 2⁶⁴.
• Method split() constructs and returns a new SplittableRandom instance that shares no mutable state with the current instance. However, with very high probability, the values collectively generated by the two objects have the same statistical properties as if the same quantity of values were generated by a single thread using a single SplittableRandom object.
• Instances of SplittableRandom are not thread-safe. They are designed to be split, not shared, across threads. For example, a fork/join-style computation using random numbers might include a construction of the form new Subtask(aSplittableRandom.split()).fork().
• This class provides additional methods for generating random streams, that employ the above techniques when used in stream.parallel() mode.

SplittableRandom实例不具有密码安全性。 请考虑在安全敏感的应用程序中使用SecureRandom 。 此外，除非system property java.util.secureRandomSeed设置为true否则默认构建的实例不使用加密随机种子。

Summary

Inherited methods

From class java.lang.Object Object clone() 创建并返回此对象的副本。 boolean equals(Object obj) 指示其他某个对象是否“等于”这一个。 void finalize() 当垃圾收集确定没有更多对该对象的引用时，由对象上的垃圾回收器调用。 final Class<?> getClass() 返回此 Object的运行时类。 int hashCode() 返回对象的哈希码值。 final void notify() 唤醒正在等待该对象监视器的单个线程。 final void notifyAll() 唤醒在该对象监视器上等待的所有线程。 String toString() 返回对象的字符串表示形式。 final void wait(long millis, int nanos) 导致当前线程等待，直到另一个线程为此对象调用 notify()方法或 notifyAll()方法，或者某个其他线程中断当前线程或经过一定的实时时间。 final void wait(long millis) 导致当前线程等待，直到另一个线程调用此对象的 notify()方法或 notifyAll()方法或经过指定的时间量。 final void wait() 导致当前线程等待，直到另一个线程调用此对象的 notify()方法或 notifyAll()方法。

Public constructors

SplittableRandom (long seed)

SplittableRandom ()

Public methods

DoubleStream doubles (long streamSize)

DoubleStream doubles ()

DoubleStream doubles (double randomNumberOrigin, 
                double randomNumberBound)

DoubleStream doubles (long streamSize, 
                double randomNumberOrigin, 
                double randomNumberBound)

IntStream ints (long streamSize)

IntStream ints (long streamSize, 
                int randomNumberOrigin, 
                int randomNumberBound)

IntStream ints (int randomNumberOrigin, 
                int randomNumberBound)

IntStream ints ()

LongStream longs ()

LongStream longs (long streamSize)

LongStream longs (long randomNumberOrigin, 
                long randomNumberBound)

LongStream longs (long streamSize, 
                long randomNumberOrigin, 
                long randomNumberBound)

boolean nextBoolean ()

double nextDouble ()

double nextDouble (double bound)

double nextDouble (double origin, 
                double bound)

int nextInt ()

int nextInt (int origin, 
                int bound)

int nextInt (int bound)

long nextLong (long bound)

long nextLong ()

long nextLong (long origin, 
                long bound)

SplittableRandom split ()