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# Package java.util

## Classes

AbstractCollection | Abstract base class for collection implementations.
AbstractList | Abstract base class for list implementations.
AbstractMap | See Sun's JDK 1.4 Javadoc for documentation.
AbstractSet | Abstract base class for set implementations.
ArrayList | See Sun's JDK 1.4 documentation for documentation.
Arrays | Utility methods related to native arrays.
Collections | Utility methods that operate on collections.
ConcurrentModificationException | See the official Java API doc for details.
Date | Represents a date and time.
EmptyStackException | See the official Java API doc for details.
EventObject | Available as a superclass of event objects.
HashMap | See Sun's JDK 1.4 documentation for documentation on the `HashMap` API.
HashSet | Implements a set in terms of a hash table.
MissingResourceException | See the official Java API doc for details.
NoSuchElementException | See the official Java API doc for details.
Stack | Maintains a last-in, first-out collection of objects.
TooManyListenersException | Thrown when the subject of an observer cannot support additional observers.
Vector | To keep performance characteristics in line with Java community expectations, `Vector` is a wrapper around `ArrayList`.

## Interfaces

Collection | General-purpose interface for storing collections of objects.
Comparator | An interface used a basis for implementing custom ordering.
EventListener | A tag interface that other "listener" interfaces can extend to indicate their adherence to the observer pattern.
Iterator | See the official Java API doc for details.
List | Represents a sequence of objects.
ListIterator | Uses Java 1.4 ListIterator for documentation.
Map | Abstract interface for maps.
RandomAccess | Indicates that a data structure supports constant-time random access to its contained objects.
Set | Represents a set of unique objects.