java.util

Interface Summary
Interface	Description
Collection<E>	The root interface in the collection hierarchy.
Comparator<T>	A comparison function, which imposes a total ordering on some collection of objects.
Enumeration<E>	An object that implements the Enumeration interface generates a series of elements, one at a time.
EventListener	A tagging interface that all event listener interfaces must extend.
Iterator<E>	An iterator over a collection.
List<E>	An ordered collection (also known as a sequence).
ListIterator<E>	An iterator for lists that allows the programmer to traverse the list in either direction, modify the list during iteration, and obtain the iterator's current position in the list.
Map<K,V>	An object that maps keys to values.
Map.Entry<K,V>	A map entry (key-value pair).
Observer	A class can implement the `Observer` interface when it wants to be informed of changes in observable objects.
RandomAccess	Marker interface used by `List` implementations to indicate that they support fast (generally constant time) random access.
Set<E>	A collection that contains no duplicate elements.

Class Summary
Class	Description
AbstractCollection<E>	This class provides a skeletal implementation of the `Collection` interface, to minimize the effort required to implement this interface.
AbstractList<E>	This class provides a skeletal implementation of the `List` interface to minimize the effort required to implement this interface backed by a "random access" data store (such as an array).
AbstractMap<K,V>	This class provides a skeletal implementation of the `Map` interface, to minimize the effort required to implement this interface.
AbstractMap.SimpleEntry<K,V>	An Entry maintaining a key and a value.
AbstractMap.SimpleImmutableEntry<K,V>	An Entry maintaining an immutable key and value.
AbstractSet<E>	This class provides a skeletal implementation of the `Set` interface to minimize the effort required to implement this interface.
ArrayList<E>	Resizable-array implementation of the `List` interface.
Calendar	The `Calendar` class is an abstract class that provides methods for converting between a specific instant in time and a set of `calendar fields` such as `YEAR` , `MONTH` , `DAY_OF_MONTH`, `HOUR`, and so on, and for manipulating the calendar fields, such as getting the date of the next week.
Date	The class `Date` represents a specific instant in time, with millisecond precision.
Dictionary<K,V>	The `Dictionary` class is the abstract parent of any class, such as `Hashtable`, which maps keys to values.
EventObject	The root class from which all event state objects shall be derived.
HashMap<K,V>	Hash table based implementation of the `Map` interface.
Hashtable<K,V>	This class implements a hash table, which maps keys to values.
Observable	This class represents an observable object, or "data" in the model-view paradigm.
PropertyPermission	This class is for property permissions.
Random	An instance of this class is used to generate a stream of pseudorandom numbers.
Stack<E>	The `Stack` class represents a last-in-first-out (LIFO) stack of objects.
Timer	Deprecated Please consider `ej.bon.Timer from BON specification instead.`
TimerTask	Deprecated Please consider `ej.bon.TimerTask from BON specification instead.`
TimeZone	`TimeZone` represents a time zone offset, and also figures out daylight savings.
Vector<E>	The `Vector` class implements a growable array of objects.
WeakHashMap<K,V>	Hash table based implementation of the `Map` interface, with weak keys.

Exception Summary
Exception	Description
ConcurrentModificationException	This exception may be thrown by methods that have detected concurrent modification of an object when such modification is not permissible.
EmptyStackException	Thrown by methods in the `Stack` class to indicate that the stack is empty.
NoSuchElementException	Thrown by the `nextElement` method of an `Enumeration` to indicate that there are no more elements in the enumeration.

Package java.util Description

Contains utility classes including the collections framework and date manipulation.