visual basic 6 barcode generator javautil Part 1: The Collections Framework in Java

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javautil Part 1: The Collections Framework
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his chapter begins our examination of javautil This important package contains a large assortment of classes and interfaces that support a broad range of functionality For example, javautil has classes that generate pseudorandom numbers, manage date and time, observe events, manipulate sets of bits, tokenize strings, and handle formatted data The javautil 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 javautil contains a wide array of functionality, it is quite large Here is a list of its classes:
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AbstractCollection AbstractList AbstractMap AbstractQueue AbstractSequentialList AbstractSet ArrayDeque (Added by Java SE 6) ArrayList Arrays BitSet Calendar Collections Currency Date Dictionary EnumMap EnumSet EventListenerProxy EventObject FormattableFlags Formatter GregorianCalendar HashMap HashSet Hashtable IdentityHashMap LinkedHashMap LinkedHashSet LinkedList ListResourceBundle Locale Observable PriorityQueue Properties PropertyPermission PropertyResourceBundle Random ResourceBundle Scanner ServiceLoader (Added by Java SE 6) SimpleTimeZone Stack StringTokenizer Timer TimerTask TimeZone TreeMap TreeSet UUID Vector WeakHashMap
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Part II:
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The interfaces defined by javautil are shown next:
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Collection Comparator Enumeration EventListener Formattable Iterator List ListIterator MapEntry NavigableSet (Added by Java SE 6) Observer Queue RandomAccess Set SortedMap
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Deque (Added by Java SE 6) Map
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NavigableMap (Added by Java SE 6) SortedSet
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Because of its size, the description of javautil is broken into two chapters This chapter examines those members of javautil that are part of the Collections Framework 18 discusses its other classes and interfaces
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Collections Overview
The Java Collections Framework standardizes the way in which groups of objects are handled by your programs Collections were not part of the original Java release, but were added by J2SE 12 Prior to the Collections Framework, Java provided ad hoc classes such as Dictionary, Vector, Stack, and Properties to store and manipulate groups of objects Although these classes were quite useful, they lacked a central, unifying theme The way that you used Vector was different from the way that you used Properties, for example Also, this early, ad hoc approach was not designed to be easily extended or adapted Collections are an answer to these (and other) problems The Collections Framework was designed to meet several goals First, the framework had to be high-performance The implementations for the fundamental collections (dynamic arrays, linked lists, trees, and hash tables) are highly efficient You seldom, if ever, need to code one of these data engines manually Second, the framework had to allow different types of collections to work in a similar manner and with a high degree of interoperability Third, extending and/or adapting a collection had to be easy Toward this end, the entire Collections Framework is built upon a set of standard interfaces Several standard implementations (such as LinkedList, HashSet, and TreeSet) of these interfaces are provided that you may use as-is You may also implement your own collection, if you choose Various special-purpose implementations are created for your convenience, and some partial implementations are provided that make creating your own collection class easier Finally, mechanisms were added that allow the integration of standard arrays into the Collections Framework Algorithms are another important part of the collection mechanism Algorithms operate on collections and are defined as static methods within the Collections class Thus, they are available for all collections Each collection class need not implement its own versions The algorithms provide a standard means of manipulating collections Another item closely associated with the Collections Framework is the Iterator interface An iterator offers a general-purpose, standardized way of accessing the elements within a collection, one at a time Thus, an iterator provides a means of enumerating the contents of a collection Because each collection implements Iterator, the elements of any collection class can be accessed through the methods defined by Iterator Thus, with only small changes, the code that cycles through a set can also be used to cycle through a list, for example
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