void (String[] args) { List list = new ArrayList(); list = Collections.emptyList(); Set set = new HashSet(); set = Collections.emptySet(); Map map = new HashMap(); map = Collections.emptyMap(); Collection unmodifiableCollection = list; List unmodifiableList = list; Set unmodifiableSet = set; Map unmodifiableMap = map; SortedSet unmodifiableSortedSet = set; SortedMap unmodifiableSortedMap = map; NavigableSet unmodifiableNavigableSet = set; NavigableMap unmodifiableNavigableMap = map; }