| 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  | 
SecureRandom
This 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  | 
ThreadLocalRandom
A random number generator isolated to the current thread. 
 | 
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