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 an interface for the input method framework.
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 Java Beans development.
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.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java.security.acl	The classes and interfaces in this package have been superseded by classes in the java.security package.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.
java.sql	Provides the JDBC package.
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.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.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 ``metal'' look-and-feel.
javax.swing.plaf.multi	The multiplexing look and feel allows users to combine auxiliary look and feels with the default look and feel.
javax.swing.table	Provides classes and interfaces for dealing with java.awt.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
javax.swing.tree	Provides classes and interfaces for dealing with java.awt.swing.JTree.
javax.swing.undo	Provides support for undo/redo capabilities in an application such as a text editor.
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).

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.

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 Event class is the abstract root class from which all event state objects shall be derived.

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

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

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 Event class is the abstract 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

EventObject
The Event class is the abstract 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.

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

EventObject
The Event class is the abstract 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 Event class is the abstract 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.

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.

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.

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.

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.

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.

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 and modify the list during iteration.

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

Map
An object that maps keys to values.

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.

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.

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.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 a 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.swing

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 Event class is the abstract root class from which all event state objects shall be derived.

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

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 Event class is the abstract 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 Event class is the abstract 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 Event class is the abstract 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 org.omg.CORBA

Properties
The Properties class represents a persistent set of properties.