Java by API/java.util.concurrent.atomic/AtomicLong

AtomicLong: getAndIncrement()

 

import java.util.concurrent.atomic.AtomicLong;
public class Main {
  public static void main(String[] argv) {
    AtomicLong nextId = new AtomicLong();
    System.out.println(nextId.getAndIncrement());
  }
}