Android 2.3 Gingerbread

Package java.util

Interface Summary
Collection<E> Collection is the root of the collection hierarchy.
Comparator<T> A Comparator is used to compare two objects to determine their ordering with respect to each other.
Deque<E> A kind of collection that can insert or remove element at both ends("double ended queue").
Enumeration<E> A legacy iteration interface.
EventListener EventListener is the superclass of all event listener interfaces.
Formattable Classes that handle custom formatting for the 's' specifier of Formatter should implement the Formattable interface.
Iterator<E> An iterator over a sequence of objects, such as a collection.
List<E> A List is a collection which maintains an ordering for its elements.
ListIterator<E> An ListIterator is used to sequence over a List of objects.
Map<K,V> A Map is a data structure consisting of a set of keys and values in which each key is mapped to a single value.
Map.Entry<K,V> Map.Entry is a key/value mapping contained in a Map.
NavigableMap<K,V> NavigableMap is a SortedMap with navigation methods answering the closest matches for specified item.
NavigableSet<E> NavigableSet is a SortedSet with navigation methods answering the closest matches for specified item.
Observer Observer is the interface to be implemented by objects that receive notification of updates on an Observable object.
Queue<E> This kind of collection provides advanced operations compared to basic collections, such as insertion, extraction, and inspection.
RandomAccess RandomAccess is implemented by List implementations that support fast (usually constant time) random access.
Set<E> A Set is a data structure which does not allow duplicate elements.
SortedMap<K,V> A map that has its keys ordered.
SortedSet<E> SortedSet is a Set which iterates over its elements in a sorted order.

Class Summary
AbstractCollection<E> Class AbstractCollection is an abstract implementation of the Collection interface.
AbstractList<E> AbstractList is an abstract implementation of the List interface, optimized for a backing store which supports random access.
AbstractMap<K,V> A base class for Map implementations.
AbstractMap.SimpleEntry<K,V> A key-value mapping with mutable values.
AbstractMap.SimpleImmutableEntry<K,V> An immutable key-value mapping.
AbstractQueue<E> AbstractQueue is an abstract class which implements some of the methods in Queue.
AbstractSequentialList<E> AbstractSequentialList is an abstract implementation of the List interface.
AbstractSet<E> An AbstractSet is an abstract implementation of the Set interface.
ArrayDeque<E> An implementation of Deque, backed by an array.
ArrayList<E> ArrayList is an implementation of List, backed by an array.
Arrays Arrays contains static methods which operate on arrays.
BitSet The BitSet class implements a bit field.
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.
Collections Collections contains static methods which operate on Collection classes.
ComparableTimSort This is a near duplicate of TimSort, modified for use with arrays of objects that implement Comparable, instead of using explicit comparators.
Currency This class represents a currency as identified in the ISO 4217 currency codes.
Date Date represents a specific moment in time, to the millisecond.
Dictionary<K,V> Note: Do not use this class since it is obsolete.
DualPivotQuicksort This class implements the Dual-Pivot Quicksort algorithm by Vladimir Yaroslavskiy, Jon Bentley, and Joshua Bloch.
EnumMap<K extends Enum<K>,V> An Map specialized for use with Enum types as keys.
EnumSet<E extends Enum<E>> An EnumSet is a specialized Set to be used with enums as keys.
EventListenerProxy This abstract class provides a simple wrapper for objects of type EventListener.
EventObject EventObjects represent events.
FormattableFlags FormattableFlags are used as a parameter to Formattable.formatTo(Formatter, int, int, int) and change the output format in Formattables.
Formatter Formats arguments according to a format string (like printf in C).
Grego A utility class providing proleptic Gregorian calendar functions used by time zone and calendar code.
GregorianCalendar GregorianCalendar is a concrete subclass of Calendar and provides the standard calendar used by most of the world.
HashMap<K,V> HashMap is an implementation of Map.
HashSet<E> HashSet is an implementation of a Set.
Hashtable<K,V> Hashtable is a synchronized implementation of Map.
HugeEnumSet<E extends Enum<E>> A concrete EnumSet for enums with more than 64 elements.
IdentityHashMap<K,V> IdentityHashMap is a variant on HashMap which tests equality by reference instead of equality by value.
LinkedHashMap<K,V> LinkedHashMap is an implementation of Map that guarantees iteration order.
LinkedHashMap.LinkedEntry<K,V> LinkedEntry adds nxt/prv double-links to plain HashMapEntry.
LinkedHashSet<E> LinkedHashSet is a variant of HashSet.
LinkedList<E> LinkedList is an implementation of List, backed by a doubly-linked list.
ListResourceBundle ListResourceBundle is the abstract superclass of classes which provide resources by implementing the getContents() method to return the list of resources.
Locale Locale represents a language/country/variant combination.
MapEntry<K,V> MapEntry is an internal class which provides an implementation of Map.Entry.
MiniEnumSet<E extends Enum<E>> A concrete EnumSet for enums with 64 or fewer elements.
Observable Observable is used to notify a group of Observer objects when a change occurs.
PriorityQueue<E> A PriorityQueue holds elements on a priority heap, which orders the elements according to their natural order or according to the comparator specified at construction time.
Properties A Properties object is a Hashtable where the keys and values must be Strings.
PropertyPermission PropertyPermission objects represent a permission to access system properties.
PropertyPermissionCollection A PermissionCollection for holding PropertyPermissions.
PropertyResourceBundle PropertyResourceBundle loads resources from an InputStream.
Random This class provides methods that generates pseudo-random numbers of different types, such as int, long, double, and float.
ResourceBundle ResourceBundle is an abstract class which is the superclass of classes which provide Locale-specific resources.
Scanner A parser that parses a text string of primitive types and strings with the help of regular expressions.
ServiceLoader<S> A service-provider loader.
SimpleTimeZone SimpleTimeZone is a concrete subclass of TimeZone that represents a time zone for use with a Gregorian calendar.
SpecialAccess Holder for special cross-package access objects.
Stack<E> Stack is a Last-In/First-Out(LIFO) data structure which represents a stack of objects.
StringTokenizer The StringTokenizer class allows an application to break a string into tokens by performing code point comparison.
Timer Timers schedule one-shot or recurring tasks for execution.
TimerTask The TimerTask class represents a task to run at a specified time.
TimeZone TimeZone represents a time zone, primarily used for configuring a Calendar or SimpleDateFormat instance.
TimSort<T> A stable, adaptive, iterative mergesort that requires far fewer than n lg(n) comparisons when running on partially sorted arrays, while offering performance comparable to a traditional mergesort when run on random arrays.
TreeMap<K,V> A map whose entries are sorted by their keys.
TreeSet<E> TreeSet is an implementation of SortedSet.
UUID UUID is an immutable representation of a 128-bit universally unique identifier (UUID).
Vector<E> Vector is an implementation of List, backed by an array and synchronized.
WeakHashMap<K,V> WeakHashMap is an implementation of Map with keys which are WeakReferences.

Enum Summary
Formatter.BigDecimalLayoutForm The enumeration giving the available styles for formatting very large decimal numbers.

Exception Summary
ConcurrentModificationException An ConcurrentModificationException is thrown when a Collection is modified and an existing iterator on the Collection is used to modify the Collection as well.
DuplicateFormatFlagsException The unchecked exception will be thrown out if there are duplicate flags given out in the format specifier.
EmptyStackException An EmptyStackException is thrown if the pop/peek method of a stack is executed on an empty stack.
FormatFlagsConversionMismatchException A FormatFlagsConversionMismatchException will be thrown if a conversion and the flags are incompatible.
FormatterClosedException A FormatterClosedException will be thrown if the formatter has been closed.
IllegalFormatCodePointException An IllegalFormatCodePointException will be thrown if an invalid Unicode code point (defined by Character.isValidCodePoint(int)) is passed as a parameter to a Formatter.
IllegalFormatConversionException An IllegalFormatConversionException will be thrown when the parameter is incompatible with the corresponding format specifier.
IllegalFormatException An IllegalFormatException is thrown when a format string that contains either an illegal syntax or format specifier is transferred as a parameter.
IllegalFormatFlagsException An IllegalFormatFlagsException will be thrown if the combination of the format flags is illegal.
IllegalFormatPrecisionException An IllegalFormatPrecisionException will be thrown if the precision is a negative other than -1 or in other cases where precision is not supported.
IllegalFormatWidthException An IllegalFormatWidthException will be thrown if the width is a negative value other than -1 or in other cases where a width is not supported.
InputMismatchException An InputMismatchException is thrown by a scanner to indicate that the next token does not match or is out of range for the type specified in the pattern.
InvalidPropertiesFormatException An InvalidPropertiesFormatException is thrown if loading the XML document defining the properties does not follow the Properties specification.
MissingFormatArgumentException A MissingFormatArgumentException will be thrown if there is no corresponding argument with the specified conversion or an argument index that refers to a missing argument.
MissingFormatWidthException A MissingFormatWidthException will be thrown if the format width is missing but is required.
MissingResourceException A MissingResourceException is thrown by ResourceBundle when a resource bundle cannot be found or a resource is missing from a resource bundle.
NoSuchElementException A NoSuchElementException is thrown when trying to retrieve an element past the end of an Enumeration, or the first or last element from an empty Vector.
TooManyListenersException A TooManyListenersException is thrown when an attempt is made to add more than one listener to an event source which only supports a single listener.
UnknownFormatConversionException An UnknownFormatConversionException will be thrown if the format conversion is unknown.
UnknownFormatFlagsException An UnknownFormatFlagsException will be thrown if there is an unknown flag.

Error Summary
ServiceConfigurationError Thrown when a service provider can't be loaded by ServiceLoader.