org.apache.commons.collections
インタフェース 
Closure
Predicate
PriorityQueue
Transformer
クラス 
ArrayEnumeration
ArrayIterator
ArrayStack
BeanMap
BinaryHeap
CollectionUtils
CursorableLinkedList
DefaultMapEntry
EnumerationIterator
ExtendedProperties
FastArrayList
FastHashMap
FastTreeMap
FilterIterator
IteratorEnumeration
LRUMap
MapUtils
ProxyIterator
SoftRefHashMap
SynchronizedPriorityQueue
TransformIterator