void (String[] args) { Collections unmodifiableCollection = Collections.unmodifiableCollecti<caret>on(Collections.EMPTY_LIST); List unmodifiableList = Collections.unmodifiableList(Collections.EMPTY_LIST); Set unmodifiableSet = Collections.unmodifiableSet(Collections.EMPTY_SET); Map unmodifiableMap = Collections.unmodifiableMap(Collections.EMPTY_MAP); SortedSet unmodifiableSortedSet = Collections.unmodifiableSortedSet(Collections.EMPTY_SET); SortedMap unmodifiableSortedMap = Collections.unmodifiableSortedMap(Collections.EMPTY_MAP); NavigableSet unmodifiableNavigableSet = Collections.unmodifiableNavigableSet(Collections.EMPTY_SET); NavigableMap unmodifiableNavigableMap = Collections.unmodifiableNavigableMap(Collections.EMPTY_MAP); }