shohaku.core.collections.decorator
クラス 
DecoratedCollection
DecoratedIterator
DecoratedList
DecoratedListIterator
DecoratedMap
DecoratedMapEntry
DecoratedMapEntrySet
DecoratedRandomAccessList
DecoratedSet
DecoratedSortedMap
DecoratedSortedSet
UnmodifiableIterator
UnmodifiableListIterator