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  Class Diagrams

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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