... at least not "official".
You can easily google two or three "WeakList" example implementation and for "WeakSet" one very good can be found in NetBeans Platform API fuentes.
Leí pregunta similar placed here asking for WeakSet. Answers were "there is no usecase for WeakSet". If it will be like this why these unofficial implementations exist?
preguntado el 27 de agosto de 11 a las 22:08
Perhaps you can get one by using
Collections.newSetFromMap(new WeakHashMap()). Many collections don't exist as public classes (if they are not-so-important), but can be obtained by the
Collections factory methods.