### Question:
IdUtil { public static UUID fastUUID() { ThreadLocalRandom random = ThreadLocalRandom.current(); return new UUID(random.nextLong(), random.nextLong()); }  static UUID fastUUID();  }### Answer:
@Test public void normal() { UUID id1 = IdUtil.fastUUID(); UUID id2 = IdUtil.fastUUID(); System.out.println("UUID1:" + id1); System.out.println("UUID2:" + id2); }