Introduction to Class Diagrams
Class diagrams shown a set of classes interfaces collaborations and their relationships .
Class diagrams are specifically used to model the static design view of a system.
As we know that a class is a collection of objects with common structure, common behaviour and common relationships . it depicts the foundation blocks of objects oriented system methodology showings the static view of the model including attributes operations and their relationship. A class diagram shows the existence of classes and their relationships in the logical view of a system. Usually a class diagram is shown by a rectangle having three compartments ( already discussed in chapter 7 ) comprising of the name of class attributes and the operations respectively as shown in fig 8.12,below:
Diagram visibility of Attributes and Operations
Visibility rules define the concept of encapsulation . there are four visibility levels defined in UML namely public private protected and package ( package starts with .........)
Example 1 . in NFS ( a popular car racing game ) car is an object having different attributes like model colour point and owner where owner is public points is protected and rest of two attributes are private. The function operations of class car are public create car private draw car and protected run car. Then the class is represented in UML as shown below in fig 8.13, these properties like protected, private and public are called visibility.
Key points about the class diagram are:
1. The class name is mentioned at the top it is a compulsory field and rest are optional fields.
2. The attributes are mentioned next. The public attributes start with + sign , protected with # sign and the private attributes with a sign.
3. The operations are also represented in a similar way. Like the sign +, # and - are used for public protected and private operations or functions.
Lastly there is an optional field for writing comments.
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