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CS 426 /CPE 426 Senior Projects

Chapter 7: Classes and Objects &Chapter 8: Finding Analysis Classes

[Arlow and Neustadt, 2005]

February 19, 2008

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Outline

Objects UML Notation for Objects Classes UML Notation for Classes UP Activity: Analyze Use Cases Analysis Classes Finding Analysis Classes

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Objects

Object = “A discrete entity with well-defined boundary that encapsulates state and behavior, an instance of a class” [J. Rumbaugh]

Properties of objects: IdentityStateBehavior

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Objects: Encapsulation

Fig. 7.2 [Arlow & Neustadt, 2005]

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Objects: Messaging

Figure 7.3 [Arlow & Neustadt, 2005]

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Objects: UML Notation

Figure 7.4 [Arlow & Neustadt, 2005]

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Classes

Class = “The descriptor for a set of objects that share the same attributes, operations, methods, relationships, and behavior” [J. Rumbaugh]

Every object is an instance of exactly one class

Choosing the right classification scheme is a key factor in object-oriented analysis and design

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Classes: Classification of Objects

Figure 7.5 [Arlow & Neustadt, 2005]Classifying objects determining classes

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Classes: Relationship with Objects.

Figure 7.6 [Arlow & Neustadt, 2005]<<instantiate>> relationship

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Classes: .Relationship with Objects

The <<instantiate>> relationship is a stereotype of the dependency relationship

Dependency: “A relationship between two elements in which a change to one element (the supplier) may affect or supply information needed by the other element (the client)”.

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Classes: UML Notation……

Figure 7.7 [Arlow & Neustadt, 2005]

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Classes: .UML Notation…..

Figure 7.8 [Arlow & Neustadt, 2005]The attribute compartment

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Classes: ..UML Notation….

Table 7.3 [Arlow & Neustadt, 2005]. Visibility types

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Classes: …UML Notation…Table 7.4 [Arlow & Neustadt, 2005]:

Visibility semantics in UML, Java and C#

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Classes: ….UML Notation..

Figure 7.10 [Arlow & Neustadt, 2005] Operations

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Classes: …..UML Notation.

Figure 7.14 [Arlow & Neustadt, 2005]Class stereotypes

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Classes: ……UML Notation

Figure 7.16 [Arlow & Neustadt, 2005]

Constructors

Figure 7.15 [Arlow & Neustadt, 2005]

Class Scope

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Classes: Analysis Classes… Figure 8.2 [Arlow & Neustadt, 2005]

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Classes: .Analysis Classes..

Figure 8.3 [Arlow and Neustadt, 2005]

Example of Analysis Class

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Classes: ..Analysis Classes.

Figure 8.4 [Jim Arlow and Ila Neustadt, 2005] Brainstorming, part of CRC analysis technique

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Classes: …Analysis Classes

Finding analysis classes by using RUP stereotypes:

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Boundary Classes

Used to model interactions between system and its actors and collect requirements on system’s boundaries

Often represent windows, screens, APIs[Kendall V. Scott]

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Control Classes

Used to encapsulate control related to a specific use case

Represent coordination, sequencing, transactions, and control of other objects

[Kendall V. Scott]

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Entity Classes

Used to model long-lived/persistent information

[Kendall V. Scott]