Package java.util

Contains the collections framework, legacy collection classes, event model, date and time facilities, internationalization, and miscellaneous utility classes (a string tokenizer, a random-number generator, and a bit array).

See:
Description

Interface Summary

Collection<E>	The root interface in the collection hierarchy.
Deque<E>	A linear collection that supports element insertion and removal at both ends.
NavigableMap<K,V>	A SortedMap extended with navigation methods returning the closest matches for given search targets.
NavigableSet<E>	A SortedSet extended with navigation methods reporting closest matches for given search targets.
Queue<E>	A collection designed for holding elements prior to processing.

Class Summary

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.
AbstractQueue<E>	This class provides skeletal implementations of some Queue operations.
ArrayDeque<E>	Resizable-array implementation of the Deque interface.
ArrayList<E>	Resizable-array implementation of the List interface.
Collections	This class consists exclusively of static methods that operate on or return collections.
LinkedList<E>	Linked list implementation of the List interface.
PriorityQueue<E>	An unbounded priority queue based on a priority heap.
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.
TreeMap<K,V>	A Red-Black tree based NavigableMap implementation.
TreeSet<E>	A NavigableSet implementation based on a TreeMap.
Vector<E>	The Vector class implements a growable array of objects.

Package java.util Description

Contains the collections framework, legacy collection classes, event model, date and time facilities, internationalization, and miscellaneous utility classes (a string tokenizer, a random-number generator, and a bit array).

Package Specification

• Collections Framework Overview
• Collections Framework Annotated Outline

Related Documentation

For overviews, tutorials, examples, guides, and tool documentation, please see:

• Collections Framework Tutorial
• Collections Framework Design FAQ

Since:

JDK1.0