Collections.emptyList() instead of null check?

Question

If I have a rarely used collection in some class which may be instantiated many times, I may sometimes resort to the following \"idiom\" in order to save unnecessary object crea

Answer 1

If you only use the list for iterations, you could just use: for (Object object : list) which wouldn't do anything for empty lists, i.e. not a single iteration.

Otherwise just check list.isEmpty().