//Creates a Random instance with a seed of 12345.
Random random = new Random(12345L);
//Gets a ThreadLocalRandom instance
ThreadLocalRandom tlr = ThreadLocalRandom.current();
//Set the instance's seed.
tlr.setSeed(12345L);
Using the same seed to generate random numbers will return the same numbers every time, so setting a different seed for every Random
instance is a good idea if you don’t want to end up with duplicate numbers.
A good method to get a Long
that is different for every call is [System.currentTimeMillis()](<https://docs.oracle.com/javase/7/docs/api/java/lang/System.html#currentTimeMillis()>)
:
Random random = new Random(System.currentTimeMillis());
ThreadLocalRandom.current().setSeed(System.currentTimeMillis());