Uses of Package
java.util

Packages that use java.util

java.applet	Provides the classes necessary to create an applet and the classes an applet uses to communicate with its applet context.
java.awt	Contains all of the classes for creating user interfaces and for painting graphics and images.
java.awt.datatransfer	Provides interfaces and classes for transferring data between and within applications.
java.awt.dnd	Drag and Drop is a direct manipulation gesture found in many Graphical User Interface systems that provides a mechanism to transfer information between two entities logically associated with presentation elements in the GUI.
java.awt.event	Provides interfaces and classes for dealing with different types of events fired by AWT components.
java.awt.font	Provides classes and interface relating to fonts.
java.awt.im	Provides classes and interfaces for the input method framework.
java.awt.im.spi	Provides interfaces that enable the development of input methods that can be used with any Java runtime environment.
java.awt.image	Provides classes for creating and modifying images.
java.awt.image.renderable	Provides classes and interfaces for producing rendering-independent images.
java.beans	Contains classes related to developing beans -- components based on the JavaBeansTM architecture.
java.beans.beancontext	Provides classes and interfaces relating to bean context.
java.io	Provides for system input and output through data streams, serialization and the file system.
java.lang	Provides classes that are fundamental to the design of the Java programming language.
java.math	Provides classes for performing arbitrary-precision integer arithmetic (BigInteger) and arbitrary-precision decimal arithmetic (BigDecimal).
java.net	Provides the classes for implementing networking applications.
java.nio.channels	Defines channels, which represent connections to entities that are capable of performing I/O operations, such as files and sockets; defines selectors, for multiplexed, non-blocking I/O operations.
java.nio.channels.spi	Service-provider classes for the java.nio.channels package.
java.nio.charset	Defines charsets, decoders, and encoders, for translating between bytes and Unicode characters.
java.nio.charset.spi	Service-provider classes for the java.nio.charset package.
java.rmi.activation	Provides support for RMI Object Activation.
java.security	Provides the classes and interfaces for the security framework.
java.security.acl	The classes and interfaces in this package have been superseded by classes in the java.security package.
java.security.cert	Provides classes and interfaces for parsing and managing certificates, certificate revocation lists (CRLs), and certification paths.
java.sql	Provides the API for accessing and processing data stored in a data source (usually a relational database) using the JavaTM programming language.
java.text	Provides classes and interfaces for handling text, dates, numbers, and messages in a manner independent of natural languages.
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).
java.util.jar	Provides classes for reading and writing the JAR (Java ARchive) file format, which is based on the standard ZIP file format with an optional manifest file.
java.util.logging	Provides the classes and interfaces of the JavaTM 2 platform's core logging facilities.
java.util.prefs	This package allows applications to store and retrieve user and system preference and configuration data.
java.util.zip	Provides classes for reading and writing the standard ZIP and GZIP file formats.
javax.accessibility	Defines a contract between user-interface components and an assistive technology that provides access to those components.
javax.imageio	The main package of the Java Image I/O API.
javax.imageio.event	A package of the Java Image I/O API dealing with synchronous notification of events during the reading and writing of images.
javax.imageio.metadata	A package of the Java Image I/O API dealing with reading and writing metadata.
javax.imageio.plugins.jpeg	Classes supporting the built-in JPEG plug-in.
javax.imageio.spi	A package of the Java Image I/O API containing the plug-in interfaces for readers, writers, transcoders, and streams, and a runtime registry.
javax.naming	Provides the classes and interfaces for accessing naming services.
javax.naming.directory	Extends the javax.naming package to provide functionality for accessing directory services.
javax.naming.event	Provides support for event notification when accessing naming and directory services.
javax.naming.ldap	Provides support for LDAPv3 extended operations and controls.
javax.naming.spi	Provides the means for dynamically plugging in support for accessing naming and directory services through the javax.naming and related packages.
javax.net.ssl	Provides classes for the secure socket package.
javax.print.attribute	Provides classes and interfaces that describe the types of JavaTM Print Service attributes and how they can be collected into attribute sets.
javax.print.attribute.standard	Package javax.print.attribute.standard contains classes for specific printing attributes.
javax.print.event	Package javax.print.event contains event classes and listener interfaces.
javax.security.auth	This package provides a framework for authentication and authorization.
javax.security.auth.callback	This package provides the classes necessary for services to interact with applications in order to retrieve information (authentication data including usernames or passwords, for example) or to display information (error and warning messages, for example).
javax.security.auth.kerberos	This package contains utility classes related to the Kerberos network authentication protocol.
javax.security.auth.login	This package provides a pluggable authentication framework.
javax.security.auth.spi	This package provides the interface to be used for implementing pluggable authentication modules.
javax.sound.midi	Provides interfaces and classes for I/O, sequencing, and synthesis of MIDI (Musical Instrument Digital Interface) data.
javax.sound.sampled	Provides interfaces and classes for capture, processing, and playback of sampled audio data.
javax.sql	Provides the API for server side data source access and processing from the JavaTM programming language.
javax.swing	Provides a set of "lightweight" (all-Java language) components that, to the maximum degree possible, work the same on all platforms.
javax.swing.event	Provides for events fired by Swing components.
javax.swing.plaf.basic	Provides user interface objects built according to the Basic look and feel.
javax.swing.plaf.metal	Provides user interface objects built according to the Java look and feel (once codenamed Metal), which is the default look and feel.
javax.swing.plaf.multi	Provides user interface objects that combine two or more look and feels.
javax.swing.table	Provides classes and interfaces for dealing with javax.swing.JTable.
javax.swing.text	Provides classes and interfaces that deal with editable and noneditable text components.
javax.swing.text.html	Provides the class HTMLEditorKit and supporting classes for creating HTML text editors.
javax.swing.text.html.parser	Provides the default HTML parser, along with support classes.
javax.swing.tree	Provides classes and interfaces for dealing with javax.swing.JTree.
javax.swing.undo	Allows developers to provide support for undo/redo in applications such as text editors.
javax.xml.transform	This package defines the generic APIs for processing transformation instructions, and performing a transformation from source to result.
org.omg.CORBA	Provides the mapping of the OMG CORBA APIs to the JavaTM programming language, including the class ORB, which is implemented so that a programmer can use it as a fully-functional Object Request Broker (ORB).
org.xml.sax	Provides the classes and interfaces for the Simple API for XML (SAX) which is a component of the Java API for XML Processing.
org.xml.sax.helpers	Provides helper classes for the Simple API for XML (SAX) which is a component of the Java API for XML Processing.

Classes in java.util used by java.applet

Enumeration
An object that implements the Enumeration interface generates a series of elements, one at a time.

Iterator
An iterator over a collection.

Locale
A Locale object represents a specific geographical, political, or cultural region.

Classes in java.util used by java.awt

Collection
The root interface in the collection hierarchy.

EmptyStackException
Thrown by methods in the Stack class to indicate that the stack is empty.

Enumeration
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.

EventObject
The root class from which all event state objects shall be derived.

Hashtable
This class implements a hashtable, which maps keys to values.

List
An ordered collection (also known as a sequence).

Locale
A Locale object represents a specific geographical, political, or cultural region.

Map
An object that maps keys to values.

Properties
The Properties class represents a persistent set of properties.

ResourceBundle
Resource bundles contain locale-specific objects.

Set
A collection that contains no duplicate elements.

Classes in java.util used by java.awt.datatransfer

List
An ordered collection (also known as a sequence).

Map
An object that maps keys to values.

Classes in java.util used by java.awt.dnd

ArrayList
Resizable-array implementation of the List interface.

EventListener
A tagging interface that all event listener interfaces must extend.

EventObject
The root class from which all event state objects shall be derived.

Iterator
An iterator over a collection.

List
An ordered collection (also known as a sequence).

TooManyListenersException
The TooManyListenersException Exception is used as part of the Java Event model to annotate and implement a unicast special case of a multicast Event Source.

Classes in java.util used by java.awt.event

EventListener
A tagging interface that all event listener interfaces must extend.

EventListenerProxy
An abstract wrapper class for an EventListener class which associates a set of additional parameters with the listener.

EventObject
The root class from which all event state objects shall be derived.

Classes in java.util used by java.awt.font

Map
An object that maps keys to values.

Classes in java.util used by java.awt.im

Locale
A Locale object represents a specific geographical, political, or cultural region.

Map
An object that maps keys to values.

Classes in java.util used by java.awt.im.spi

Locale
A Locale object represents a specific geographical, political, or cultural region.

Classes in java.util used by java.awt.image

Hashtable
This class implements a hashtable, which maps keys to values.

Vector
The Vector class implements a growable array of objects.

Classes in java.util used by java.awt.image.renderable

Vector
The Vector class implements a growable array of objects.

Classes in java.util used by java.beans

Enumeration
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.

EventListenerProxy
An abstract wrapper class for an EventListener class which associates a set of additional parameters with the listener.

EventObject
The root class from which all event state objects shall be derived.

Classes in java.util used by java.beans.beancontext

ArrayList
Resizable-array implementation of the List interface.

Collection
The root interface in the collection hierarchy.

EventListener
A tagging interface that all event listener interfaces must extend.

EventObject
The root class from which all event state objects shall be derived.

HashMap
Hash table based implementation of the Map interface.

Iterator
An iterator over a collection.

Locale
A Locale object represents a specific geographical, political, or cultural region.

TooManyListenersException
The TooManyListenersException Exception is used as part of the Java Event model to annotate and implement a unicast special case of a multicast Event Source.

Classes in java.util used by java.io

Enumeration
An object that implements the Enumeration interface generates a series of elements, one at a time.

Classes in java.util used by java.lang

Comparator
A comparison function, which imposes a total ordering on some collection of objects.

Enumeration
An object that implements the Enumeration interface generates a series of elements, one at a time.

Locale
A Locale object represents a specific geographical, political, or cultural region.

Properties
The Properties class represents a persistent set of properties.

Classes in java.util used by java.math

Random
An instance of this class is used to generate a stream of pseudorandom numbers.

Classes in java.util used by java.net

Enumeration
An object that implements the Enumeration interface generates a series of elements, one at a time.

Map
An object that maps keys to values.

Classes in java.util used by java.nio.channels

Set
A collection that contains no duplicate elements.

Classes in java.util used by java.nio.channels.spi

Set
A collection that contains no duplicate elements.

Classes in java.util used by java.nio.charset

Locale
A Locale object represents a specific geographical, political, or cultural region.

Set
A collection that contains no duplicate elements.

SortedMap
A map that further guarantees that it will be in ascending key order, sorted according to the natural ordering of its keys (see the Comparable interface), or by a comparator provided at sorted map creation time.

Classes in java.util used by java.nio.charset.spi

Iterator
An iterator over a collection.

Classes in java.util used by java.rmi.activation

Properties
The Properties class represents a persistent set of properties.

Classes in java.util used by java.security

Collection
The root interface in the collection hierarchy.

Date
The class Date represents a specific instant in time, with millisecond precision.

Dictionary
The Dictionary class is the abstract parent of any class, such as Hashtable, which maps keys to values.

Enumeration
An object that implements the Enumeration interface generates a series of elements, one at a time.

Hashtable
This class implements a hashtable, which maps keys to values.

Map
An object that maps keys to values.

Properties
The Properties class represents a persistent set of properties.

Random
An instance of this class is used to generate a stream of pseudorandom numbers.

Set
A collection that contains no duplicate elements.

Classes in java.util used by java.security.acl

Enumeration
An object that implements the Enumeration interface generates a series of elements, one at a time.

Classes in java.util used by java.security.cert

Collection
The root interface in the collection hierarchy.

Date
The class Date represents a specific instant in time, with millisecond precision.

Iterator
An iterator over a collection.

List
An ordered collection (also known as a sequence).

Set
A collection that contains no duplicate elements.

Classes in java.util used by java.sql

Calendar
Calendar is an abstract base class for converting between a Date object and a set of integer fields such as YEAR, MONTH, DAY, HOUR, and so on.

Date
The class Date represents a specific instant in time, with millisecond precision.

Enumeration
An object that implements the Enumeration interface generates a series of elements, one at a time.

Map
An object that maps keys to values.

Properties
The Properties class represents a persistent set of properties.

Classes in java.util used by java.text

Calendar
Calendar is an abstract base class for converting between a Date object and a set of integer fields such as YEAR, MONTH, DAY, HOUR, and so on.

Comparator
A comparison function, which imposes a total ordering on some collection of objects.

Currency
Represents a currency.

Date
The class Date represents a specific instant in time, with millisecond precision.

Locale
A Locale object represents a specific geographical, political, or cultural region.

Map
An object that maps keys to values.

Set
A collection that contains no duplicate elements.

TimeZone
TimeZone represents a time zone offset, and also figures out daylight savings.

Classes in java.util used by java.util

AbstractCollection
This class provides a skeletal implementation of the Collection interface, to minimize the effort required to implement this interface.

AbstractList
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
This class provides a skeletal implementation of the Map interface, to minimize the effort required to implement this interface.

AbstractSequentialList
This class provides a skeletal implementation of the List interface to minimize the effort required to implement this interface backed by a "sequential access" data store (such as a linked list).

AbstractSet
This class provides a skeletal implementation of the Set interface to minimize the effort required to implement this interface.

ArrayList
Resizable-array implementation of the List interface.

BitSet
This class implements a vector of bits that grows as needed.

Calendar
Calendar is an abstract base class for converting between a Date object and a set of integer fields such as YEAR, MONTH, DAY, HOUR, and so on.

Collection
The root interface in the collection hierarchy.

Comparator
A comparison function, which imposes a total ordering on some collection of objects.

Currency
Represents a currency.

Date
The class Date represents a specific instant in time, with millisecond precision.

Dictionary
The Dictionary class is the abstract parent of any class, such as Hashtable, which maps keys to values.

Enumeration
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.

HashMap
Hash table based implementation of the Map interface.

HashSet
This class implements the Set interface, backed by a hash table (actually a HashMap instance).

Hashtable
This class implements a hashtable, which maps keys to values.

Iterator
An iterator over a collection.

List
An ordered collection (also known as a sequence).

ListIterator
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.

Locale
A Locale object represents a specific geographical, political, or cultural region.

Map
An object that maps keys to values.

Map.Entry
A map entry (key-value pair).

MissingResourceException
Signals that a resource is missing.

Observable
This class represents an observable object, or "data" in the model-view paradigm.

Observer
A class can implement the Observer interface when it wants to be informed of changes in observable objects.

Properties
The Properties class represents a persistent set of properties.

Random
An instance of this class is used to generate a stream of pseudorandom numbers.

RandomAccess
Marker interface used by List implementations to indicate that they support fast (generally constant time) random access.

ResourceBundle
Resource bundles contain locale-specific objects.

Set
A collection that contains no duplicate elements.

SortedMap
A map that further guarantees that it will be in ascending key order, sorted according to the natural ordering of its keys (see the Comparable interface), or by a comparator provided at sorted map creation time.

SortedSet
A set that further guarantees that its iterator will traverse the set in ascending element order, sorted according to the natural ordering of its elements (see Comparable), or by a Comparator provided at sorted set creation time.

TimerTask
A task that can be scheduled for one-time or repeated execution by a Timer.

TimeZone
TimeZone represents a time zone offset, and also figures out daylight savings.

Vector
The Vector class implements a growable array of objects.

Classes in java.util used by java.util.jar

Collection
The root interface in the collection hierarchy.

Enumeration
An object that implements the Enumeration interface generates a series of elements, one at a time.

Map
An object that maps keys to values.

Set
A collection that contains no duplicate elements.

Classes in java.util used by java.util.logging

Enumeration
An object that implements the Enumeration interface generates a series of elements, one at a time.

ResourceBundle
Resource bundles contain locale-specific objects.

Classes in java.util used by java.util.prefs

EventListener
A tagging interface that all event listener interfaces must extend.

EventObject
The root class from which all event state objects shall be derived.

Classes in java.util used by java.util.zip

Enumeration
An object that implements the Enumeration interface generates a series of elements, one at a time.

Classes in java.util used by javax.accessibility

ListResourceBundle
ListResourceBundle is an abstract subclass of ResourceBundle that manages resources for a locale in a convenient and easy to use list.

Locale
A Locale object represents a specific geographical, political, or cultural region.

ResourceBundle
Resource bundles contain locale-specific objects.

Vector
The Vector class implements a growable array of objects.

Classes in java.util used by javax.imageio

Iterator
An iterator over a collection.

List
An ordered collection (also known as a sequence).

Locale
A Locale object represents a specific geographical, political, or cultural region.

Set
A collection that contains no duplicate elements.

Classes in java.util used by javax.imageio.event

EventListener
A tagging interface that all event listener interfaces must extend.

Classes in java.util used by javax.imageio.metadata

List
An ordered collection (also known as a sequence).

Locale
A Locale object represents a specific geographical, political, or cultural region.

Classes in java.util used by javax.imageio.plugins.jpeg

Locale
A Locale object represents a specific geographical, political, or cultural region.

Classes in java.util used by javax.imageio.spi

Iterator
An iterator over a collection.

Locale
A Locale object represents a specific geographical, political, or cultural region.

Classes in java.util used by javax.naming

Enumeration
An object that implements the Enumeration interface generates a series of elements, one at a time.

Hashtable
This class implements a hashtable, which maps keys to values.

Properties
The Properties class represents a persistent set of properties.

Vector
The Vector class implements a growable array of objects.

Classes in java.util used by javax.naming.directory

Hashtable
This class implements a hashtable, which maps keys to values.

Vector
The Vector class implements a growable array of objects.

Classes in java.util used by javax.naming.event

EventListener
A tagging interface that all event listener interfaces must extend.

EventObject
The root class from which all event state objects shall be derived.

Classes in java.util used by javax.naming.ldap

EventListener
A tagging interface that all event listener interfaces must extend.

EventObject
The root class from which all event state objects shall be derived.

Hashtable
This class implements a hashtable, which maps keys to values.

Classes in java.util used by javax.naming.spi

Hashtable
This class implements a hashtable, which maps keys to values.

Classes in java.util used by javax.net.ssl

Enumeration
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.

EventObject
The root class from which all event state objects shall be derived.

Classes in java.util used by javax.print.attribute

Date
The class Date represents a specific instant in time, with millisecond precision.

Locale
A Locale object represents a specific geographical, political, or cultural region.

Classes in java.util used by javax.print.attribute.standard

AbstractCollection
This class provides a skeletal implementation of the Collection interface, to minimize the effort required to implement this interface.

AbstractMap
This class provides a skeletal implementation of the Map interface, to minimize the effort required to implement this interface.

AbstractSet
This class provides a skeletal implementation of the Set interface to minimize the effort required to implement this interface.

Collection
The root interface in the collection hierarchy.

Date
The class Date represents a specific instant in time, with millisecond precision.

HashMap
Hash table based implementation of the Map interface.

HashSet
This class implements the Set interface, backed by a hash table (actually a HashMap instance).

Locale
A Locale object represents a specific geographical, political, or cultural region.

Map
An object that maps keys to values.

Set
A collection that contains no duplicate elements.

Classes in java.util used by javax.print.event

EventObject
The root class from which all event state objects shall be derived.

Classes in java.util used by javax.security.auth

Set
A collection that contains no duplicate elements.

Classes in java.util used by javax.security.auth.callback

Locale
A Locale object represents a specific geographical, political, or cultural region.

Classes in java.util used by javax.security.auth.kerberos

Date
The class Date represents a specific instant in time, with millisecond precision.

Classes in java.util used by javax.security.auth.login

Map
An object that maps keys to values.

Classes in java.util used by javax.security.auth.spi

Map
An object that maps keys to values.

Classes in java.util used by javax.sound.midi

EventListener
A tagging interface that all event listener interfaces must extend.

Vector
The Vector class implements a growable array of objects.

Classes in java.util used by javax.sound.sampled

EventListener
A tagging interface that all event listener interfaces must extend.

EventObject
The root class from which all event state objects shall be derived.

Classes in java.util used by javax.sql

Calendar
Calendar is an abstract base class for converting between a Date object and a set of integer fields such as YEAR, MONTH, DAY, HOUR, and so on.

EventListener
A tagging interface that all event listener interfaces must extend.

EventObject
The root class from which all event state objects shall be derived.

Map
An object that maps keys to values.

Classes in java.util used by javax.swing

Comparator
A comparison function, which imposes a total ordering on some collection of objects.

Date
The class Date represents a specific instant in time, with millisecond precision.

Dictionary
The Dictionary class is the abstract parent of any class, such as Hashtable, which maps keys to values.

Enumeration
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.

EventObject
The root class from which all event state objects shall be derived.

Hashtable
This class implements a hashtable, which maps keys to values.

List
An ordered collection (also known as a sequence).

Locale
A Locale object represents a specific geographical, political, or cultural region.

Map
An object that maps keys to values.

Vector
The Vector class implements a growable array of objects.

Classes in java.util used by javax.swing.event

EventListener
A tagging interface that all event listener interfaces must extend.

EventObject
The root class from which all event state objects shall be derived.

Classes in java.util used by javax.swing.plaf.basic

EventListener
A tagging interface that all event listener interfaces must extend.

Hashtable
This class implements a hashtable, which maps keys to values.

Vector
The Vector class implements a growable array of objects.

Classes in java.util used by javax.swing.plaf.metal

EventListener
A tagging interface that all event listener interfaces must extend.

Classes in java.util used by javax.swing.plaf.multi

Vector
The Vector class implements a growable array of objects.

Classes in java.util used by javax.swing.table

Enumeration
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.

Locale
A Locale object represents a specific geographical, political, or cultural region.

Vector
The Vector class implements a growable array of objects.

Classes in java.util used by javax.swing.text

Dictionary
The Dictionary class is the abstract parent of any class, such as Hashtable, which maps keys to values.

Enumeration
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.

Vector
The Vector class implements a growable array of objects.

Classes in java.util used by javax.swing.text.html

Enumeration
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.

EventObject
The root class from which all event state objects shall be derived.

Vector
The Vector class implements a growable array of objects.

Classes in java.util used by javax.swing.text.html.parser

BitSet
This class implements a vector of bits that grows as needed.

Enumeration
An object that implements the Enumeration interface generates a series of elements, one at a time.

Hashtable
This class implements a hashtable, which maps keys to values.

Vector
The Vector class implements a growable array of objects.

Classes in java.util used by javax.swing.tree

Enumeration
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.

EventObject
The root class from which all event state objects shall be derived.

Vector
The Vector class implements a growable array of objects.

Classes in java.util used by javax.swing.undo

EventListener
A tagging interface that all event listener interfaces must extend.

Hashtable
This class implements a hashtable, which maps keys to values.

Vector
The Vector class implements a growable array of objects.

Classes in java.util used by javax.xml.transform

Properties
The Properties class represents a persistent set of properties.

Classes in java.util used by org.omg.CORBA

Properties
The Properties class represents a persistent set of properties.

Classes in java.util used by org.xml.sax

Locale
A Locale object represents a specific geographical, political, or cultural region.

Classes in java.util used by org.xml.sax.helpers

Enumeration
An object that implements the Enumeration interface generates a series of elements, one at a time.

Locale
A Locale object represents a specific geographical, political, or cultural region.