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Uses of Package
java.util

Packages that use java.util

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.security	Provides the classes and interfaces for the security framework.
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.

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.security

Collection
The root interface in the collection hierarchy.

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.

Set
A collection that contains no duplicate elements.

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.

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.

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.

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.

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.