Uses of Package
java.util

Packages that use java.util

Package	Description
java.lang	Contains core language classes.
java.util	Contains utility classes including the collections framework and date manipulation.

Classes in java.util used by java.lang

Class and Description
Comparator A comparison function, which imposes a total ordering on some collection of objects.
Iterator An iterator over a collection.
Map An object that maps keys to values.

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.
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.
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.
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).
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.
RandomAccess Marker interface used by List implementations to indicate that they support fast (generally constant time) random access.
Set A collection that contains no duplicate elements.
TimerTask Deprecated. Please consider ej.bon.TimerTask from BON specification instead.
TimeZone TimeZone represents a time zone offset, and also figures out daylight savings.
Vector The Vector class implements a growable array of objects.