metsker apos s design patterns java workbook addison wesley

... in Java , Second Edition: Design Principles and Patterns Design Patterns Design Patterns for Object-Oriented Software Development Pattern Hatching: Design Patterns Applied SanFranciso™ Design Patterns ... units, such as inches and pounds 19 Chapter Adapter Figure 3.3 Oozinoz models units as instances of the Measure class, whose subclasses represent particular physical dimensions A unit is a standard ... corpsales@pearsoned.com Visit Addison- Wesley on the Web: www.aw.com/cseng/ Library of Congress Cataloging-in-Publication Data Metsker, Steven John Design patterns Java workbook / Steven John Metsker...

Ngày tải lên: 16/01/2014, 20:20

... Praise for Design Patterns in Ruby Design Patterns in Ruby documents smart ways to resolve many problems that Ruby developers commonly encounter Russ Olsen has done a great job of selecting classic ... Here 26 But Sometimes There Is No Object 27 Truth, Lies, and nil 28 Decisions, Decisions 30 Loops 32 More about Strings 34 Symbols 37 Arrays 38 Hashes 40 Regular Expressions 40 A Class of Your ... including those that implement patterns • Ruby has code closures It allows us to pass around chunks of code and associated scope without having to laboriously construct entire classes and objects that...

Ngày tải lên: 29/04/2014, 14:42

... this program on the example CD-ROM as singleSpooler .java Static Classes as Singleton Patterns There already is a kind of Singleton class in the standard Java class libraries: the Math class This ... FirstFirst class, we assume that everything before the last space is part of the first name: class FirstFirst extends Namer { //split first last public FirstFirst(String s) { int i = s. lastIndexOf(" ... Visiting Several Classes 214 Bosses are Employees, too 215 Double Dispatching 216 Traversing a Series of Classes 216 Consequence of the Visitor Pattern 210 216 10 SOME BACKGROUND ON DESIGN PATTERNS...

Ngày tải lên: 16/01/2014, 20:20

... this program on the example CD-ROM as singleSpooler .java Static Classes as Singleton Patterns There already is a kind of Singleton class in the standard Java class libraries: the Math class This ... FirstFirst class, we assume that everything before the last space is part of the first name: class FirstFirst extends Namer { //split first last public FirstFirst(String s) { int i = s. lastIndexOf(" ... Visiting Several Classes 214 Bosses are Employees, too 215 Double Dispatching 216 Traversing a Series of Classes 216 Consequence of the Visitor Pattern 210 216 10 SOME BACKGROUND ON DESIGN PATTERNS...

Ngày tải lên: 13/07/2014, 07:20

... makes many design patterns so important Design patterns can exist at many levels, from very low-level specific solutions to broadly generalized system issues There are now hundreds of patterns ... getLast methods We'll store the split first and last names in the Strings first and last, and, since the subclasses will need access to these variables, we'll make them protected The Two Subclasses ... subtle extension of this idea, where no single class makes the decision as to which subclass to instantiate Instead, the superclass defers the decision to each subclass This pattern does not actually...

Ngày tải lên: 25/02/2015, 15:15

... in Java , Second Edition: Design Principles and Patterns Design Patterns Design Patterns for Object-Oriented Software Development Pattern Hatching: Design Patterns Applied SanFranciso™ Design Patterns ... units, such as inches and pounds 19 Chapter Adapter Figure 3.3 Oozinoz models units as instances of the Measure class, whose subclasses represent particular physical dimensions A unit is a standard ... corpsales@pearsoned.com Visit Addison- Wesley on the Web: www.aw.com/cseng/ Library of Congress Cataloging-in-Publication Data Metsker, Steven John Design patterns Java workbook / Steven John Metsker...

Ngày tải lên: 20/03/2014, 15:39

... Java design patterns 101 Page of 22 Presented by developerWorks, your source for great tutorials ibm.com/developerWorks Section Design patterns overview A brief history of design patterns Design ... in several well-known catalogs * Be able to use design patterns as a vocabulary for understanding and discussing object-oriented software design * Understand a few of the most common design patterns ... details to consider, language-specific issues * Sample code: Sample code in Smalltalk and C++ * Known uses: Examples from the real world * Related patterns: Comparison and discussion of related patterns...

Ngày tải lên: 12/08/2014, 19:21

... + ((Sensor) o).getReading()); } public static void main(String []ac) { Sensor sensor = new Sensor(); Display display = new Display(); // register observer with observable class sensor.addObserver(display); ... as an abstract class and it is often used to provide a blueprint or an outline for concrete subclasses Sometimes this is used to implement hooks in a system, such as an application framework Java ... displays The Java API uses this pattern in the event model of its AWT/Swing classes It also provides direct support so this pattern can be implemented for other purposes The Java API provides...

Ngày tải lên: 12/08/2014, 19:21

... Defining Design Patterns 14 The Learning Process 15 Studying Design Patterns 16 Notes on Object-Oriented Approaches 16 The Java Foundation Classes .17 Java ... Classes .225 Visiting Several Classes .226 Bosses Are Employees, Too 227 Catch-All Operations Using Visitors .228 Double Dispatching .229 Traversing a Series ... Traversing a Series of Classes .229 Consequences of the Visitor Pattern 229 Programs on the CD-ROM 230 Section 5: Design Patterns and the Java Foundation Classes 231 Chapter...

Ngày tải lên: 12/08/2014, 19:21

... pattern is a clever but subtle extension of this idea, where no single class makes the decision as to which subclass to instantiate Instead, the superclass defers the decision to each subclass This ... other design patterns (such as the Builder pattern, discussed in Chapter 7) In these cases, a single class acts as a traffic cop and decides which subclass of a single hierarchy will be instantiated ... subclasses That is, you don't know whether you can call a class method unless you know whether the subclass is one that allows those methods This problem has the same two solutions as does any similar...

Ngày tải lên: 12/08/2014, 19:21

... prototype is two subclasses away from the base class; the first subclass selects a single sex, and the second subclass creates a histogram In other words, the Prototype pattern effectively hides the ... JclassAwtList extends Jlist implements ListSelectionListener, awtList { private JListData listContents; public JclassAwtList (int rows) { listContents = new JListData(); setModel(listContents); setPrototypeCellValue("Abcdefg ... \Adapter\TwoLists\Twolist .java Description An AWT version of two lists An object adapter version \Adapter\JTwoLists\JTwoList .java A class adapter version \Adapter\JtwoClassList\ JTwoClassList .java Illustrates...

Ngày tải lên: 12/08/2014, 19:21

... the base classes Note that FilterInputStream contains an instance of InputStream Decorators, Adapters, and Composites 105 As noted in Design Patterns, an essential similarity exists among these ... responsibilities to selected instances of the class It also allows customizing a class without creating subclasses high in the inheritance hierarchy Design Patterns points out two disadvantages of ... public resultSet Execute(String sql); } Following is the Results class: class Results { public Results(ResultSet rset); //constructor public String[] getMetaData(); public boolean hasMoreElements();...

Ngày tải lên: 12/08/2014, 19:21

... class, and finally to the RestList class Note that FileList is a subclass of RestList and implements the Chain interface because the parent RestList class does Programming a Help System As we ... capabilities of the other classes It provides a loose coupling between these classes; the only common link is the request that is passed between them The request is passed along until one of the classes ... number of instances that are allocated must be decided as the class instances are needed; usually aFlyweightFactory class does this This factory class usually is a Singleton, sinceit needs to keep...

Ngày tải lên: 12/08/2014, 19:21

... shown as a series of simple if statements If you have many more than that, Design Patterns suggests that you create a class for each This makes language extension easier, but it has the disadvantage ... classes until one of them recognizes that configuration and acts on it You can decide whether a successful stack reduction should end that pass; it is perfectly possible to have several successive ... easily add new verbs or variables once the foundation is constructed In the simple parsing scheme, shown in the previous Parser class, there are only six cases to consider and they are shown as...

Ngày tải lên: 12/08/2014, 19:21

... relationship of a subclass that inherits from a superclass The class diagram in Figure 2.6 shows the abstract class Product as the superclass of the ConcreteProduct class You can tell that it is abstract ... Patterns in Java The first volume focused exclusively on general-purpose design patterns The second volume moved away from design patterns to include a variety of patterns used to assign responsibilities ... class There is another use for ellipsis in a class diagram Some class diagrams need to show that a class has a large or open-ended set of subclasses FIGURE 2.11 Aggregation Manages ▲ MessageManager...

Ngày tải lên: 14/08/2014, 02:20

... class StateSavingClass1, StateSavingClass2, Classes in this role are responsible for saving and restoring the state of TransactionParticipant objects These classes are usually specific to a single ... ensure the consistency of a transaction is testing The Unit Testing and System Testing patterns described in Patterns in Java, Volume are useful in designing appropriate tests Using the Assertion ... The Stub, CallDispatcher, and Skeleton roles constitute a message layer Stub classes turn a call into a message, which is interpreted by CallDispatcher and Skeleton classes Skeleton classes are...

Ngày tải lên: 14/08/2014, 02:20

... to ensure that no single failure can make a system unavailable Since this is a book about software design, this pattern ignores the hardware issues It describes how to ensure that a single software ... it is shared between programs or databases CONTEXT Suppose you’re designing a computer system for a business that operates a barter clearinghouse for the exchange of goods and services The same ... mission-critical computing components on space flights Software used by stock exchanges to process stock trades use redundant software components The software used to manage telephone networks...

Ngày tải lên: 14/08/2014, 02:20

... messages, it includes a set of topics of interest That results in messages associated with only those topics being sent to the recipient object KNOWN USES Sybase s SQL Anywhere uses publish-subscribe ... class s instances ⁄ Malicious classes can call the private methods of other classes and access the private variables of other classes However, malicious classes cannot access the local variables ... initiated a message is :MessageSource r: Recipient 2B.1: deliver(message) 2A*: publish(message) 1: subscribe(r) 1.1: subscribe (s) s: Subscriber 2B*: deliver(message) FIGURE 6.8 Publish-Subscribe collaboration...

Ngày tải lên: 14/08/2014, 02:20

... ArrayList getMessages() { ArrayList temp = (ArrayList)messages.clone(); messages.clear(); return temp; } // getMessages() } // class Mailbox RELATED PATTERNS Publish-Subscribe The Publish-Subscribe pattern ... superclass s constructor It passes it twice This is because RMI allows you to use a separate object for a Socket factory and a ServerSocket factory Since the subclass of Socket and ServerSocket ... class extends the ServerSocket class so that the Socket object it creates when it accepts a connection sends heartbeat messages to the client public class HeartbeatServerSocket extends ServerSocket...

Ngày tải lên: 14/08/2014, 02:20

... includes the session object Another aspect of this is that the server does not use any session specific resources, such as files or locks, unless it is processing a call from a session s client ... that shares the file system that the session object is stored on In many cases, the session is associated with a user rather than a computer or file system In such cases, it is usually desirable ... process each session Instance variables are shared by all threads Session objects must be visible only to the thread that is processing the corresponding session One way to make the session object...

Ngày tải lên: 14/08/2014, 02:20