Using java.util.concurrent.AtomicLong: A numerical id, start at zero and increment by one. : UUID « Development « Java Tutorial

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import java.util.concurrent.atomic.AtomicLong;

public class Main {
  public static void main(String[] argv) {
    AtomicLong nextId = new AtomicLong();

    System.out.println(nextId.getAndIncrement());
  }
}