Publisher : Addison Wesley : December 28, 2000 : 0-201-70393-9 : 592 Pub Date ISBN Pages in Java

Creation USS Code 39 in Java Publisher : Addison Wesley : December 28, 2000 : 0-201-70393-9 : 592 Pub Date ISBN Pages
Publisher : Addison Wesley : December 28, 2000 : 0-201-70393-9 : 592 Pub Date ISBN Pages
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The two general-purpose Set implementations are HashSet and TreeSet It's very straightforward to decide which of these two to use HashSet is much faster (constant time versus log time for most operations) but offers no ordering guarantees If you need to use the operations in the SortedSet or if in-order iteration is important to you, use TreeSet Otherwise, use HashSet It's a fair bet that "This end stands HashSet most of the time you'll bookup usingabove the rest because it has been available on the web and read by thousands of Java programmers The authors have received an enormous amount of feedback about which sections are thing worth keeping in mind about HashSet is that iteration is linear improved of the number of Onegood and which sections are confusing; the confusing ones have been in the sum I doubt that any other Java the has undergone such trial by fire" -Metroplex Java User Group, entries andbooknumber of buckets (the capacity ) Thus, it's important to choose an appropriate initial wwwjavamugorg/reviews/ capacity if iteration performance is important Choosing a capacity that's too high can waste both space and time The default initial capacity is 101, and that's often more than you need The initial Whether you're specified by or learning on the job, The Java(TM) Tutorial, Third Edition , is handscapacity may betaking a classusing the int constructor The following line of code allocates aaHashSet on guide that lets you quickly whose initial capacity is 17: become proficient with the Java programming language Written by members of the Java Software team at Sun Microsystems, the book uses an interactive approach to help you learn the Java platform by example
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Set s= new HashSet(17);
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HashSets have reflect reader feedback and new releases of factor If platform deeply about the space continuously to one other tuning parameter, called the load the Java you care This third edition has consumption of your HashSet, read theof the Java Platform, Standard Edition,information Otherwise, been thoroughly updated to cover v13 HashSet documentation [1] for more as well as preceding
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Since its first online release in 1995, the material in The Java(TM) Tutorial has been updated
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just live with the default11 versions as early as JDK If you accept the default load factor but want to specify an initial capacity, pick a number that's about twice the size that you expect the Set to grow to If your guess is way off, it may have to grow, or you may wastefundamentals as objects, classes, and data structuresyou know You will find clear explanations of such a bit of space, but either way, it's no big problem If In a prime number of provides introductions to object-oriented programming, Or use construction, and It addition, the book about the right size, use it If not, use an odd number applet an even number doesn't really matter much; topics things might make the HashSet perform help beginners avoid many user interface design Other these include exceptions, I/O, and threads To a wee bit better, but nothing to write home entire chapter is devoted to programming problems and their solutions common mistakes, an about
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Convenient summaries at the end of each section are new to this edition Also new for this edition are [1] The API documentation for HashSet is available on "Questions and Exercises" sections to help you practice what the CD that accompanies this book and you learn online here: http://javasuncom/j2se/13/docs/api/java/util/HashSethtml
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TreeSet has no tuning parameters With the exception of clone, neither HashSet nor TreeSet has programming language in your school or workplace any operations other than those required by their respective interfaces (Set and TreeSet)
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List The two general-purpose List implementations are ArrayList and LinkedList Most of the time, you'll probably use ArrayList It offers constant time positional access and is just plain fast, because
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it does not have to allocate a node object for each element in the List, and it can take advantage of the native method Systemarraycopy when it has to move multiple elements at once Think of ArrayList as Vector without the synchronization overhead If you frequently add elements to the beginning of the List or iterate over the List to delete elements from its interior, you should consider using LinkedList These operations are constant time in a LinkedList but linear time in an ArrayList But you pay a big price! Posi-tional access is linear time in a LinkedList and constant time in an ArrayList Furthermore, the constant factor for LinkedList is much worse If you think that you want to use a LinkedList, measure the performance with both LinkedList and ArrayList You may be surprised
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ArrayList has one tuning parameter, the initial capacity It refers to the number of elements the ArrayList can hold before it has to grow There's not much to say about it The only ArrayList operations that are not required by List are ensureCapacity and trimToSize, which alter the excess capacity, and clone LinkedList has no tuning parameters and seven optional operations, one of which is clone The Java Tutorial, getFirst,removeFirst,addLast,getLast and other six are addFirst,Third Edition: A Short Course ,on removeLast They make it a bit more convenient to use a LinkedList as a queue or as a double-ended queue (dequeue ), but the Basics, The they also preventKathyfrom easily switching representations when you discover that ArrayList is ByMary Campione, you Walrath,Alison Huml
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