Project Report of Electricity Billing System Page 1



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Interaction diagrams
: shows how several objects collaborate in single use case. 
Package diagram
: show group of classes and dependencies among them. 
State diagram
: show how single object behaves across many use cases. 
Activity diagram
: shows behavior with control structure. Can show many objects over 
many uses, many object in single use case, or implementations methods encourage 
parallel behavior, etc. 


Project Report of Electricity Billing System 
 
Page - 24 
The end-product of this project is a comprehensive tool that can parse any vb.net 
program and extract most of the object oriented features inherent in the program such 
as polymorphism, inheritance, encapsulation and abstraction. 
What is UML? 
UML stands for Unified Modeling Language is the successor to the wave of 
Object Oriented Analysis and Design (OOA&D) methods that appeared in the late 80’s. 
It most directly unifies the methods of Booch, Rumbaugh (OMT) and Jacobson. The 
UML is called a modeling language, not a method. Most methods consist at least in 
principle, of both a modeling language and a process. The Modeling language is that 
notation that methods used to express design. 
Notations and meta-models

The notation is the graphical stuff; it is the syntax of the modeling language. For 
instance, class diagram notation defines how items are concepts such as class, 
association, and multiplicity is represented. These are: 
Class Diagram
: The class diagram technique has become truly central within object-
oriented methods. Virtually every method has included some variation on this technique.
Class diagram is also subject to the greatest range of modeling concept. Although the 
basic elements are needed by everyone, advanced concepts are used less often. A 
class diagram describes the types of objects in the system and the various kinds of 
static relationship that exist among them. There are two principal kinds of static 
relationship: 

Association 

Subtype 
Class diagram also show the attributes and operations of a class and the constraints 
that apply to the way objects are connected. 

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