java.util (JDK 1.6)

Package: java.util

Author(s)

Since

JDK1.0

Version

Serial

Description

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).

See also: com.sun.javadoc.MemberDoc com.sun.javadoc.MemberDoc com.sun.javadoc.ClassDoc Collections java.util.concurrent ArrayList HashMap

AbstractCollection View Source	This class provides a skeletal implementation of the `Collection` interface, to minimize the effort required to implement this interface.
AbstractList View Source	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 View Source	This class provides a skeletal implementation of the `Map` interface, to minimize the effort required to implement this interface.
AbstractMap.SimpleEntry View Source	An Entry maintaining a key and a value.
AbstractMap.SimpleImmutableEntry View Source	An Entry maintaining an immutable key and value.
AbstractQueue View Source	This class provides skeletal implementations of some `Queue` operations.
AbstractSequentialList View Source	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 View Source	This class provides a skeletal implementation of the `Set` interface to minimize the effort required to implement this interface.
ArrayDeque View Source	Resizable-array implementation of the `Deque` interface.
ArrayList View Source	Resizable-array implementation of the `List` interface.
Arrays View Source	This class contains various methods for manipulating arrays (such as sorting and searching).
BitSet View Source	This class implements a vector of bits that grows as needed.
Calendar View Source	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 View Source	The root interface in the collection hierarchy.
Collections View Source	This class consists exclusively of static methods that operate on or return collections.
Comparator View Source	A comparison function, which imposes a total ordering on some collection of objects.
ConcurrentModificationException View Source	This exception may be thrown by methods that have detected concurrent modification of an object when such modification is not permissible.
Currency View Source	Represents a currency.
Date View Source	The class `Date` represents a specific instant in time, with millisecond precision.
Deque View Source	A linear collection that supports element insertion and removal at both ends.
Dictionary View Source	The `Dictionary` class is the abstract parent of any class, such as `Hashtable`, which maps keys to values.
DuplicateFormatFlagsException View Source	Unchecked exception thrown when duplicate flags are provided in the format specifier.
EmptyStackException View Source	Thrown by methods in the `Stack` class to indicate that the stack is empty.
Enumeration View Source	An object that implements the Enumeration interface generates a series of elements, one at a time.
EnumMap View Source	A specialized `Map` implementation for use with enum type keys.
EnumSet View Source	A specialized `Set` implementation for use with enum types.
EventListener View Source	A tagging interface that all event listener interfaces must extend.
EventListenerProxy View Source	An abstract wrapper class for an EventListener class which associates a set of additional parameters with the listener.
EventObject View Source	The root class from which all event state objects shall be derived.
FormatFlagsConversionMismatchException View Source	Unchecked exception thrown when a conversion and flag are incompatible.
Formattable View Source	The `Formattable` interface must be implemented by any class that needs to perform custom formatting using the `'s'` conversion specifier of `Formatter`.
FormattableFlags View Source	FomattableFlags are passed to the `Formattable.formatTo()` method and modify the output format for Formattables.
Formatter View Source	An interpreter for printf-style format strings.
Formatter.BigDecimalLayoutForm View Source
FormatterClosedException View Source	Unchecked exception thrown when the formatter has been closed.
GregorianCalendar View Source	`GregorianCalendar` is a concrete subclass of `Calendar` and provides the standard calendar system used by most of the world.
HashMap View Source	Hash table based implementation of the `Map` interface.
HashSet View Source	This class implements the `Set` interface, backed by a hash table (actually a `HashMap` instance).
Hashtable View Source	This class implements a hashtable, which maps keys to values.
IdentityHashMap View Source	This class implements the `Map` interface with a hash table, using reference-equality in place of object-equality when comparing keys (and values).
IllegalFormatCodePointException View Source	Unchecked exception thrown when a character with an invalid Unicode code point as defined by `Character.isValidCodePoint(int)` is passed to the `Formatter`.
IllegalFormatConversionException View Source	Unchecked exception thrown when the argument corresponding to the format specifier is of an incompatible type.
IllegalFormatException View Source	Unchecked exception thrown when a format string contains an illegal syntax or a format specifier that is incompatible with the given arguments.
IllegalFormatFlagsException View Source	Unchecked exception thrown when an illegal combination flags is given.
IllegalFormatPrecisionException View Source	Unchecked exception thrown when the precision is a negative value other than `-1`, the conversion does not support a precision, or the value is otherwise unsupported.
IllegalFormatWidthException View Source	Unchecked exception thrown when the format width is a negative value other than `-1` or is otherwise unsupported.
InputMismatchException View Source	Thrown by a `Scanner` to indicate that the token retrieved does not match the pattern for the expected type, or that the token is out of range for the expected type.
InvalidPropertiesFormatException View Source	Thrown to indicate that an operation could not complete because the input did not conform to the appropriate XML document type for a collection of properties, as per the `Properties` specification.
Iterator View Source	An iterator over a collection.
LinkedHashMap View Source	Hash table and linked list implementation of the `Map` interface, with predictable iteration order.
LinkedHashSet View Source	Hash table and linked list implementation of the `Set` interface, with predictable iteration order.
LinkedList View Source	Linked list implementation of the `List` interface.
List View Source	An ordered collection (also known as a sequence).
ListIterator View Source	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.
ListResourceBundle View Source	`ListResourceBundle` is an abstract subclass of `ResourceBundle` that manages resources for a locale in a convenient and easy to use list.
Locale View Source	A `Locale` object represents a specific geographical, political, or cultural region.
Map View Source	An object that maps keys to values.
Map.Entry View Source	A map entry (key-value pair).
MissingFormatArgumentException View Source	Unchecked exception thrown when there is a format specifier which does not have a corresponding argument or if an argument index refers to an argument that does not exist.
MissingFormatWidthException View Source	Unchecked exception thrown when the format width is required.
MissingResourceException View Source	Signals that a resource is missing.
NavigableMap View Source	A `SortedMap` extended with navigation methods returning the closest matches for given search targets.
NavigableSet View Source	A `SortedSet` extended with navigation methods reporting closest matches for given search targets.
NoSuchElementException View Source	Thrown by the `nextElement` method of an `Enumeration` to indicate that there are no more elements in the enumeration.
Observable View Source	This class represents an observable object, or "data" in the model-view paradigm.
Observer View Source	A class can implement the `Observer` interface when it wants to be informed of changes in observable objects.
PriorityQueue View Source	An unbounded priority queue based on a priority heap.
Properties View Source	The `Properties` class represents a persistent set of properties.
PropertyPermission View Source	This class is for property permissions.
PropertyResourceBundle View Source	`PropertyResourceBundle` is a concrete subclass of `ResourceBundle` that manages resources for a locale using a set of static strings from a property file.
Queue View Source	A collection designed for holding elements prior to processing.
Random View Source	An instance of this class is used to generate a stream of pseudorandom numbers.
RandomAccess View Source	Marker interface used by `List` implementations to indicate that they support fast (generally constant time) random access.
ResourceBundle View Source	Resource bundles contain locale-specific objects.
ResourceBundle.Control View Source	`ResourceBundle.Control` defines a set of callback methods that are invoked by the `ResourceBundle.getBundle` factory methods during the bundle loading process.
Scanner View Source	A simple text scanner which can parse primitive types and strings using regular expressions.
ServiceConfigurationError View Source	Error thrown when something goes wrong while loading a service provider.
ServiceLoader View Source	A simple service-provider loading facility.
Set View Source	A collection that contains no duplicate elements.
SimpleTimeZone View Source	`SimpleTimeZone` is a concrete subclass of `TimeZone` that represents a time zone for use with a Gregorian calendar.
SortedMap View Source	A `Map` that further provides a total ordering on its keys.
SortedSet View Source	A `Set` that further provides a total ordering on its elements.
Stack View Source	The `Stack` class represents a last-in-first-out (LIFO) stack of objects.
StringTokenizer View Source	The string tokenizer class allows an application to break a string into tokens.
Timer View Source	A facility for threads to schedule tasks for future execution in a background thread.
TimerTask View Source	A task that can be scheduled for one-time or repeated execution by a Timer.
TimeZone View Source	`TimeZone` represents a time zone offset, and also figures out daylight savings.
TooManyListenersException View Source	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.
TreeMap View Source	A Red-Black tree based `NavigableMap` implementation.
TreeSet View Source	A `NavigableSet` implementation based on a `TreeMap`.
UnknownFormatConversionException View Source	Unchecked exception thrown when an unknown conversion is given.
UnknownFormatFlagsException View Source	Unchecked exception thrown when an unknown flag is given.
UUID View Source	A class that represents an immutable universally unique identifier (UUID).
Vector View Source	The `Vector` class implements a growable array of objects.
WeakHashMap View Source	A hashtable-based `Map` implementation with weak keys.

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