UUID to unique integer id?

Question

I was wondering what the easiest way to convert a UUID to a unique integer would be? I have tried using the hash code but people tell me that it is not going to always be un

Answer 1

Answering the How can I have a unique application wide Integer:

If it needs to be unique even after restarts or if you application is clustered you may use a Database sequence.

If it just needs to be unique during the runtime use a static AtomicInteger.

EDIT (example added):

public class Sequence {

  private static final AtomicInteger counter = new AtomicInteger();

  public static int nextValue() {
    return counter.getAndIncrement();
  }
}

Usage:

int nextValue = Sequence.nextValue();

This is thread safe (different threads will always receive distinct values, and no values will be "lost")