Class java.util.stream.Collectors

Added Methods
(Collector<T, ?, R>filtering(Predicate<?, super, T>, Collector<?, super, T, A, R>)  
(Collector<T, ?, R>flatMapping(Function<?, super, T, Stream<?, extends, U>>, Collector<?, super, U, A, R>)  
(Collector<T, ?, List<T>>toUnmodifiableList()  
(Collector<T, ?, Map<K, U>>toUnmodifiableMap(Function<?, super, T, ?, extends, K>, Function<?, super, T, ?, extends, U>)  
(Collector<T, ?, Map<K, U>>toUnmodifiableMap(Function<?, super, T, ?, extends, K>, Function<?, super, T, ?, extends, U>, BinaryOperator<U>)  
(Collector<T, ?, Set<T>>toUnmodifiableSet()