@NonNullByDefault

Package java.util

Contains utility classes including the collections framework and date manipulation.

Interface Summary

Interface	Description
Collection<E>
Comparator<T>
Enumeration<E>	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.
Iterator<E>	An iterator over a collection.
List<E>	An ordered collection (also known as a sequence).
ListIterator<E>	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<K,V>	An object that maps keys to values.
Map.Entry<K,V>	A map entry (key-value pair).
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<E>

Class Summary

Class	Description
AbstractCollection<E>
AbstractList<E>
AbstractMap<K,V>	This class provides a skeletal implementation of the Map interface, to minimize the effort required to implement this interface.
AbstractMap.SimpleEntry<K,V>	An Entry maintaining a key and a value.
AbstractMap.SimpleImmutableEntry<K,V>	An Entry maintaining an immutable key and value.
AbstractSet<E>
ArrayList<E>
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.
Date	The class Date represents a specific instant in time, with millisecond precision.
Dictionary<K,V>	The Dictionary class is the abstract parent of any class, such as Hashtable, which maps keys to values.
EventObject	The root class from which all event state objects shall be derived.
HashMap<K,V>	Hash table based implementation of the Map interface.
Hashtable<K,V>	This class implements a hash table, which maps keys to values.
Observable	This class represents an observable object, or "data" in the model-view paradigm.
PropertyPermission
Random	An instance of this class is used to generate a stream of pseudorandom numbers.
Stack<E>	The Stack class represents a last-in-first-out (LIFO) stack of objects.
Timer	Deprecated. Please consider ej.bon.Timer from BON specification instead.
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<E>	The Vector class implements a growable array of objects.
WeakHashMap<K,V>	Hash table based implementation of the Map interface, with weak keys.

Exception Summary

Exception	Description
ConcurrentModificationException	This exception may be thrown by methods that have detected concurrent modification of an object when such modification is not permissible.
EmptyStackException	Thrown by methods in the Stack class to indicate that the stack is empty.
NoSuchElementException	Thrown by the nextElement method of an Enumeration to indicate that there are no more elements in the enumeration.