Randomizer

A Randomizer, initialized with the specified seed value.

Since Randomizer is only pseudo-random, and is actually deterministic based on the seed, this lets you re-create a set of "random" values. If you use the same seed over and over, you will get the same values.

This is particularly useful during testing and debugging. If you save the seed that is used to generate your initial data, you can then re-run the test using that seed to reliably re-create your "random" events.

If you want to create an adequate seed to feed into here, the value of System.currentTimeMillis() is reasonable (and is used in Randomizer.default). It's a somewhat weak seed, but decent for most purposes.

Creates a new Randomizer, whose seed is initialized based on the current time.

This should not be considered a strong source of randomness -- in cases where high entropy really matters, it's a bit mediocre -- but for general purposes it's typically good enough.

Randomizes the order of the provided List.

This takes a pre-created Randomizer, that you pass in. This means that, if you re-create a Randomizer with the same seed over and over, you will get the same shuffled order.

This takes O(n) time.