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