| Package | Description | 
|---|---|
| java.math | Provides classes for performing arbitrary-precision integer
 arithmetic ( BigInteger) and arbitrary-precision decimal
 arithmetic (BigDecimal). | 
| java.security | Provides the classes and interfaces for the security framework. | 
| java.util | Contains the collections framework, legacy collection classes, event model,
date and time facilities, internationalization, and miscellaneous utility
classes (a string tokenizer, a random-number generator, and a bit array). | 
| java.util.concurrent | Utility classes commonly useful in concurrent programming. | 
| Modifier and Type | Method and Description | 
|---|---|
| static BigInteger | BigInteger. probablePrime(int bitLength,
             Random rnd)Returns a positive BigInteger that is probably prime, with the
 specified bitLength. | 
| Constructor and Description | 
|---|
| BigInteger(int bitLength,
          int certainty,
          Random rnd)Constructs a randomly generated positive BigInteger that is probably
 prime, with the specified bitLength. | 
| BigInteger(int numBits,
          Random rnd)Constructs a randomly generated BigInteger, uniformly distributed over
 the range 0 to (2 numBits- 1), inclusive. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | SecureRandomThis class provides a cryptographically strong random number
 generator (RNG). | 
| Modifier and Type | Method and Description | 
|---|---|
| static void | Collections. shuffle(List<?> list,
       Random rnd)Randomly permute the specified list using the specified source of
 randomness. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | ThreadLocalRandomA random number generator isolated to the current thread. | 
 Submit a bug or feature 
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
 Copyright © 1993, 2017, Oracle and/or its affiliates.  All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.