Setting a seed to shuffle ArrayList in Java deterministically

Question

I have a list of integers (currently using cern.colt.list.IntArrayList). I can call \"shuffle()\" and randomly shuffle them. I would like to be able to reproduce a shuffle.

Answer 1

This is possible by using the shuffle method that allows you to provide the backing Random instance: Collections.shuffle(List list, Random rnd):

Example:

Collections.shuffle(yourList, new Random(somePredefinedSeed));