Web hosting reviews - 92 Introduction to Java Applications Chapter 2 object
92 Introduction to Java Applications Chapter 2 object is an instance of class Elevator), and there may be several objects created from one class (e.g., both the first floor button object and the second floor button object are created from class FloorButton). Component diagrams, presented in Section 13.17, model the components resources (which include graphics and audio) and packages (which are groups of classes) that make up the system. Deployment diagrams model the runtime requirements of the system (such as the computer or computers on which the system will reside), memory requirements for the system, or other devices the system requires during execution. We do not present deployment diagrams in this case study, because we are not designing a hardware-specific system our simulation requires only one computer containing the Java 2 runtime environment on which to run. Statechart diagrams, which we introduce in Section 5.11, model how an object changes state (i.e., the condition of an object at a specific time). When an object changes state, that object may behave differently in the system. Activity diagrams, which we also introduce in Section 5.11, model an object s activity that object s workflow during program execution. An activity diagram is a flowchart that models the actions the object will perform and in what order. Both collaboration diagrams and sequence diagrams model the interactions among the objects in a system. Collaboration diagrams emphasize what interactions occur, whereas sequence diagrams emphasize when interactions occur. We introduce these diagrams in Section 7.10 and Section 15.12, respectively. Use-Case diagrams represent the interaction between the user and our system (i.e., all actions the user may perform on the system). We introduce use-case diagrams in Section 12.16, where we discuss user-interface issues. In Thinking About Objects Section 3.17, we continue designing our elevator system by identifying the classes in the problem statement. We accomplish this by extracting all the nouns and noun clauses from the problem statement. Using these classes, we develop a class diagram that models the structure of our elevator simulation system. Internet and World-Wide-Web Resources Listed below are URLs and books on object-oriented design with the UML you may find these references helpful as you study the remaining sections of our case-study presentation. www.omg.com/technology/uml/index.htm This is the UML resourse page from the Object Management Group, which provides specifications for various object-oriented technologies, such as the UML. www.smartdraw.com/drawing/software/indexUML.asp This site shows how to draw UML diagrams without the use of modeling tools. www.rational.com/uml/index.jsp This is the UML resource page for Rational Software Corporation the company that created the UML. microgold.com/Stage/UML_FAQ.html This site provides the UML FAQ maintained by Rational Software. www.softdocwiz.com/Dictionary.htm This site hosts the Unified Modeling Language Dictionary, which lists and defines all terms used in the UML. Copyright 1992 2002 by Deitel & Associates, Inc. All Rights Reserved. 7/2/01
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