Uses of Package
java.util

Packages that use java.util

Package	Description
java.lang	Provides classes that are fundamental to the design of the Java programming language.
java.nio.channels	Defines channels, which represent connections to entities that are capable of performing I/O operations, such as files.
java.nio.file	Defines interfaces and classes for the Java virtual machine to access files, file attributes, and file systems.
java.security	Provides the classes and interfaces for the security framework.
java.util	Contains the collections framework, legacy collection classes, event model, date and time facilities, random-number generator, and miscellaneous utility classes.
java.util.logging	Provides the classes and interfaces of the CLDC platform's core logging facilities.

Classes in java.util used by java.lang

Class and Description
Iterator An iterator over a collection.

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

Class and Description
Set A collection that contains no duplicate elements.

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

Class and Description
ConcurrentModificationException This exception may be thrown by methods that have detected concurrent modification of an object when such modification is not permissible.
Iterator An iterator over a collection.
Set A collection that contains no duplicate elements.

Classes in java.util used by java.security

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

Classes in java.util used by java.util

Class and Description
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.
ArrayDeque Resizable-array implementation of the Deque interface.
ArrayList 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.
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.
Deque A linear collection that supports element insertion and removal at both ends.
Enumeration An object that implements the Enumeration interface generates a series of elements, one at a time.
Formatter An interpreter for printf-style format strings.
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.
Map An object that maps keys to values.
Map.Entry A map entry (key-value pair).
Properties The Properties class represents a persistent set of properties.
Queue A collection designed for holding elements prior to processing.
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.
ServiceLoader A simple service-provider loading facility.
Set A collection that contains no duplicate elements.
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.logging

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