1. EzyWrap cũng giống <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicReference.html" rel="nofollow ugc">AtomicReference</a> nó chuyên dùng để wrap lại giá trị thực tế ở bên trong.
2. Khi nào dùng nó?

String roomGroupThreadName;
doAnswer(invocation -> {
  roomGroupThreadName = Thread.currentThread().getName();
  return null;
})

doAnswer(new Answer() {
  final String roomGroupThreadNameFinal = roomGroupThreadName;
  @Override
  public Object answer(InvocationOnMock invocation) throws Throwable {
    roomGroupThreadNameFinal = Thread.currentThread().getName();
    return null;
  }
})

public void doSomething(AtomicReference output) {
    output.set("Hello World");
}