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 = Collections.unmodifiableCollecti<caret>on(list); List unmodifiableList = Collections.unmodifiableList(list); Set unmodifiableSet = Collections.unmodifiableSet(set); Map unmodifiableMap = Collections.unmodifiableMap(map); SortedSet unmodifiableSortedSet = Collections.unmodifiableSortedSet(set); SortedMap unmodifiableSortedMap = Collections.unmodifiableSortedMap(map); NavigableSet unmodifiableNavigableSet = Collections.unmodifiableNavigableSet(set); NavigableMap unmodifiableNavigableMap = Collections.unmodifiableNavigableMap(map); }