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Introduction

Conceptual Analysis v Design

Notation

Adding Methods

Type information

Associations

Example

Reading: chapter 16, Applying UML and Patterns (3/e), Craig Larman

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In contrast with the conceptual domain model, a design

class diagram shows definitions forsoftware entities

rather thanreal world concepts.

Also referred to in UML simply as a class diagram

The Notation is basically the same as for the

Domain (Conceptual) Model.

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Class diagrams contain software definitions

Classes can be identified from the domain model, Use Cases

(fully dressed), and/or interaction diagrams

Including the methods

Some concepts will not be present in the design

Actors, may be included in later cycles

Design Class Diagrams are usually created in parallel with

interaction diagrams (e.g. Sequence Diagrams,

Collaboration Diagrams)

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Analyze use cases (fully dressed) and/or interaction diagrams for

classes

Draw them in a class diagram

Duplicate the attributes from the associated concepts in the domainmodel.

Attributes are usually assumed private if no visibility is given

Add method names by cross-referencing to interaction diagrams

Add type information to attributes & methods

Add directional associations between classes to support attributevisibility

Add dependency relationship lines

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ClassNameattributeattribute: typeATTRIBUTE : type = initial value

/derivedAttribute- privateAttribute+ publicAttribute# protectedAttributeclass attribute

method1()method2(parameter list ) : return typeabstractMethod()+ publicMethod()- privateMethod()# protectedMethod()

class method()

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The methods of each class are identified from the use cases or

from the collaboration diagrams Can be automatically generated by CASE tool

Some methods can be omitted

Create methods, e.g. constructor methods in Java or C++

Attribute accessor & mutator functions

Methods on multiobjects (i.e. a collection class)

Interpret as a message to the container

Containers add noise with little new information so

usually excluded

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If using a CASE tool with code generation

All type details are required but not necessarilyshown

For Software Developers

Exhaustive detail may affect noise-to-value ratio

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Associations on a Design Class Diagram are derived from theDomain Model and/or collaboration diagrams

Use arrowheads to indicate navigability

Navigability indicates attribute visibilityfrom a source to a target objectclass

Rolename only at the target end implies the attribute name inimplementation

Example:

Domain Model conceptual perspective show association name & multiplicity but avoid navigation arrow &

role name

Project

code : StringAllocated-to1 1

Student

id : int

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Design Model software perspective

show navigation arrow & role name often exclude the association name

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myProject

Student

id : int

Project

code : String

To be clear, the Student has twoattributes:

Using the navigabilityarrow to indicate

Student has a referenceto one Project instance

public class Student {private int id;private Project myProject;

public void setProject(Project p) {myProject = p;

}

}

Student

id : intmyProject : Project

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A dependency relationship indicates

that one element has knowledge of

another element.

In class diagrams this means

Parameter visibility

Global visibility

Locally declared visibility

Student

- id : int

+ notePresentation(Presentation)

Project

- code : String

myProject

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Presentation- time : DateTime- venue : Room

speaker1

Room

- number : String

+ getNumber() : String

venue1

Example: the Student has parametervisibility to Presentation, the methodnoteP invokes getNumber on a Room

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public class Student {private int id;private Project myProject;

public void setProject(Project p) {myProject = p;

}

public void notePresentation( Presentation p) {Room r = p.getRoom() ; //r is a local variableSystem.out.println(Room: + r.getNumber() );System.out.println(Time: + p.getTime() );

}

}

Student

- id : int- myProject : Project

+ setProject(Project p)+ notePresentation(Presentation p)

Objects communicatevia sending messages