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java.util Part 1:
The Collections Framework
T
his chapter begins our examination of java.util. This important package contains a large
assortment of classes and interfaces that support a broad range of functionality. For
example, java.util has classes that generate pseudorandom numbers, manage date and
time, observe events, manipulate sets of bits, tokenize strings, and handle formatted data.
The java.util package also contains one of Java's most powerful subsystems: The Collections
Framework. The Collections Framework is a sophisticated hierarchy of interfaces and classes
that provide state-of-the-art technology for managing groups of objects. It merits close attention
by all programmers.
Because java.util contains a wide array of functionality, it is quite large. Here is a list of
its classes:
AbstractCollection
EventObject
Random
AbstractList
FormattableFlags
ResourceBundle
AbstractMap
Formatter
Scanner
AbstractQueue
GregorianCalendar
Ser viceLoader (Added by Java SE 6.)
AbstractSequentialList
HashMap
SimpleTimeZone
AbstractSet
HashSet
Stack
ArrayDeque (Added by Java SE 6.)
Hashtable
StringTokenizer
ArrayList
IdentityHashMap
Timer
Arrays
LinkedHashMap
TimerTask
BitSet
LinkedHashSet
TimeZone
Calendar
LinkedList
TreeMap
Collections
ListResourceBundle
TreeSet
Currency
Locale
UUID
Date
Obser vable
Vector
Dictionar y
PriorityQueue
WeakHashMap
EnumMap
Proper ties
EnumSet
Proper tyPermission
EventListenerProxy
Proper tyResourceBundle
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