Answer by Akila for Initialization of an ArrayList in one line

Using Arrays.asList("Buenos Aires", "Córdoba", "La Plata"); is correct. but Any calls to Arrays.asList() with zero arguments or only one argument could be replaced with either a call to Collections.singletonList() or Collections.emptyList() which will save some memory.

Note: the list returned by Collections.singletonList() is immutable, while the list returned Arrays.asList() allows calling the set() method. This may break the code in rare cases.