book

Java™ Design Patterns: A Tutorial

Name: Java™ Design Patterns: A Tutorial
Author: James W. Cooper
ISBN: 9780201485394

by James W. Cooper

February 2000

Intermediate to advanced

352 pages

6h 31m

English

Addison-Wesley Professional

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Copyright
Preface
About the Author
Acknowledgments
1. What Are Design Patterns?
1. Introduction
Defining Design PatternsThe Learning ProcessStudying Design PatternsNotes on Object-Oriented ApproachesThe Java Foundation ClassesJava Design Patterns
2. UML Diagrams
InheritanceInterfacesCompositionAnnotationJVISION UML DiagramsVisual SlickEdit Project Files
2. Creational Patterns
3. The Factory Pattern
How a Factory WorksSample CodeThe Two SubclassesBuilding the Simple FactoryUsing the FactoryFactory Patterns in Math ComputationThought QuestionsPrograms on the CD-ROM
4. The Factory Method
The Swimmer ClassThe Event ClassesStraight SeedingCircle SeedingOur Seeding ProgramOther FactoriesWhen to Use a Factory MethodThought QuestionPrograms on the CD-ROM

5. The Abstract Factory Pattern
A GardenMaker FactoryHow the User Interface WorksAdding More ClassesConsequences of the Abstract Factory PatternThought QuestionPrograms on the CD-ROM
6. The Singleton pattern
Creating a Singleton Using a Static MethodExceptions and InstancesThrowing an ExceptionCreating an Instance of the ClassProviding a Global Point of Access to a Singleton PatternThe javax.comm Package as a SingletonBuilding a CommPortManagerOther Consequences of the Singleton PatternThought QuestionPrograms on the CD-ROM
7. The Builder Pattern
An Investment TrackerCalling the BuildersThe List Box BuilderThe Check Box BuilderConsequences of the Builder PatternThought QuestionsPrograms on the CD-ROM
8. The Prototype Pattern
Cloning in JavaUsing the PrototypeUsing the Prototype PatternPrototype ManagersCloning Using SerializationConsequences of the Prototype PatternThought QuestionPrograms on the CD-ROMSummary of Creational Patterns
3. Structural Patterns
9. The Adapter Pattern
Moving Data between ListsUsing the JFC JList ClassThe Object AdapterThe Class AdapterTwo-Way AdaptersPluggable AdaptersAdapters in JavaThought QuestionPrograms on the CD-ROM
10. The Bridge Pattern
The Class DiagramExtending the BridgeJava Beans as BridgesConsequences of the Bridge PatternThought QuestionPrograms on the CD-ROM
11. The Composite Pattern
An Implementation of a CompositeComputing SalariesThe Employee ClassesThe Boss ClassBuilding the Employee TreeSelf-PromotionDoubly Linked ListConsequences of the Composite PatternA Simple CompositeComposites in JavaOther Implementation IssuesThought QuestionsPrograms on the CD-ROM
12. The Decorator Pattern
Decorating a CoolButtonUsing a DecoratorThe Class DiagramDecorating Borders in JavaNonvisual DecoratorsDecorators, Adapters, and CompositesConsequences of the Decorator PatternThought QuestionsPrograms on the CD-ROM
13. The Façade Pattern
Building the Façade ClassesConsequences of the Façade PatternNotes on Installing and Running the dbFrame ProgramThought QuestionPrograms on the CD-ROM
14. The Flyweight Pattern
DiscussionExample CodeThe Class DiagramSelecting a FolderFlyweight Uses in JavaSharable ObjectsCopy-on-Write ObjectsThought QuestionsPrograms on the CD-ROM
15. The Proxy Pattern
Sample CodeCopy-on-WriteEnterprise Java BeansComparison with Related PatternsThought QuestionPrograms on the CD-ROMSummary of Structural Patterns
4. Behavioral Patterns
16. Chain of Responsibility Pattern
ApplicabilitySample CodeThe List BoxesProgramming a Help SystemReceiving the Help CommandA Chain or a Tree?Kinds of RequestsExamples in JavaConsequences of the Chain of ResponsibilityThought QuestionsPrograms on the CD-ROM
17. The Command Pattern
MotivationCommand ObjectsBuilding Command ObjectsThe Command PatternThe Command Pattern in the Java LanguageConsequences of the Command PatternAnonymous Inner ClassesProviding UndoThought QuestionsPrograms on the CD-ROM
18. The Interpreter Pattern
MotivationApplicabilitySimple Report ExampleInterpreting the LanguageObjects Used in ParsingReducing the Parsed StackImplementing the Interpreter PatternThe Syntax TreeConsequences of the Interpreter PatternThought QuestionPrograms on the CD-ROM
19. The Iterator Pattern
MotivationEnumerations in JavaSample CodeFiltered IteratorsThe Filtered EnumerationConsequences of the Iterator PatternComposites and IteratorsIterators in Java 1.2Thought QuestionPrograms on the CD-ROM
20. The Mediator Pattern
An Example SystemInteractions between ControlsSample CodeInitialization of the SystemMediators and Command ObjectsConsequences of the Mediator PatternSingle Interface MediatorsImplementation IssuesPrograms on the CD-ROM
21. The Memento Pattern
MotivationImplementationSample CodeConsequences of the Memento PatternThought QuestionPrograms on the CD-ROM
22. The Observer Pattern
Watching Colors ChangeThe Message to the MediaThe JList as an ObserverThe MVC Architecture as an ObserverThe Observer Interface and Observable ClassConsequences of the Observer PatternThought QuestionsPrograms on the CD-ROM
23. The State Pattern
Sample CodeSwitching between StatesHow the Mediator Interacts with the StateManagerState TransitionsMediators and the God ClassConsequences of the State PatternThought QuestionsPrograms on the CD-ROM
24. The Strategy Pattern
MotivationSample CodeThe Context ClassThe Program CommandsThe Line and Bar Graph StrategiesDrawing Plots in JavaConsequences of the Strategy PatternThought QuestionPrograms on the CD-ROM
25. The Template Pattern
MotivationKinds of Methods in a Template ClassTemplate Method Patterns in JavaAbstractTableModelAbstractBorderAbstractListModelSample CodeDrawing a Standard TriangleDrawing an Isoceles TriangleThe Triangle Drawing ProgramTemplates and CallbacksConsequences of the Template PatternThought QuestionPrograms on the CD-ROM
26. The Visitor Pattern
MotivationWhen to Use the Visitor PatternSample CodeVisiting the ClassesVisiting Several ClassesBosses Are Employees, TooCatch-All Operations Using VisitorsDouble DispatchingTraversing a Series of ClassesConsequences of the Visitor PatternThought QuestionPrograms on the CD-ROM
5. Design Patterns and the Java Foundation Classes
27. The JFC, or Swing
Installing and Using SwingIdeas behind SwingThe Swing Class Hierarchy
28. Writing a Simple JFC Program
Setting the Look and FeelSetting the Window Close BoxMaking a JxFrame ClassA Simple Two-Button ProgramMore on JButtonPrograms on the CD-ROM
29. Radio Buttons and Toolbars
Radio ButtonsThe JToolBarJToggleButtonA Sample Button ProgramPrograms on the CD-ROM
30. Menus and Actions
Action ObjectsDesign Patterns in the Action ObjectPrograms on the CD-ROM
31. The JList Class
List Selections and EventsChanging a List Display DynamicallyA Sorted JList with a ListModelSorting More-Complicated ObjectsGetting Database KeysAdding Pictures in List BoxesPrograms on the CD-ROM
32. The JTable Class
A Simple JTable ProgramCell RenderersRendering Other Kinds of ClassesSelecting Cells in a TablePatterns Used in This Image TablePrograms on the CD-ROM
33. The JTree Class
The TreeModel InterfacePrograms on the CD-ROMSummary
6. Case Studies
34. Sandy and the Mediator
35. Herb's Text Processing Tangle
36. Mary's Dilemma
Bibliography

Content preview from Java™ Design Patterns: A Tutorial

Chapter 14. The Flyweight Pattern

In this chapter we take up the Flyweight pattern, which is used to avoid the overhead of large numbers of very similar classes.

Sometimes, you need to generate a very large number of small class instances to represent data. You can greatly reduce the number of different classes that you need to instantiate if you can determine that the instances are fundamentally the same, except for a few parameters. If you can move those variables outside of the class instance and pass them in as part of a method call, you greatly reduce the number of separate instances by sharing them.

The Flyweight pattern provides an approach for handling such classes. It refers to the instance's intrinsic data that make the instance unique ...

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Java™ Design Patterns: A Tutorial

by James W. Cooper

Chapter 14. The Flyweight Pattern

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.