11 Pseudorandom Number Generators
Random number generators included in Java SE are more accurately called pseudorandom number generators (PRNGs). They create a series of numbers based on a deterministic algorithm.
The most important interfaces and classes are RandomGenerator, which enables you to generate random numbers of various primitive types given a PRNG algorithm, and RandomGeneratorFactory, which enables you to create PRNGs based on characteristics other than the algorithm's name.
See the java.util.random package for more detailed information about the PRNGs implemented in Java SE.