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ACM/JETT Workshop - August 4-5, 2005

UML Modeling using

MagicDraw

UML for Java Programmers


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UML Modeling using MagicDraw

Topics?

What is UML

How UML is used

What is MagicDraw

What UML and MagicDraw provides for Java

programmers?

o we go through features supported in MagicDraw

Demo


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What is UML?

The UML (Unified Modeling Language) was designedwith two objectives in mind:

To reflect the best practices of the industry

To demystify the process of software system

modeling.(refer toAppendix A. for more details) UML is a graphical notation for drawing diagrams of

software concepts, which allows your development teamto quickly grasp the functionality contained within theapplication.

UML is a language and a process with neutral notation,which means that you may use it to design your entireOO system in any programming language and anysoftware development process and modeling.


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How UML is used?In recent years, the tools for OO software modeling have

emerged, followed by the development of the visual

modeling approach. Visual modeling means that you first

design your system by drawing diagrams (blueprints)

and then employ tools to convert those diagrams into

code.

What is visual model tools?Today, visual modeling tools provide many features thatreplace some of the more tedious tasks for the designer,

programmer, and documentation writer.


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What is MagicDraw?MagicDraw is a visual UML modeling and CASE toolwith

teamwork support. Designed for Business Analysts,

Software Analysts, Programmers, QA Engineers, and

Documentation Writers; this dynamic and versatile

development tool facilitates analysis and design of Object

Oriented (OO) systems and databases.

MagicDraw Java version Provides Code engineering for

Java, Java bytecode. Integration with Java IDEs.

The detailed list of MagicDraw features find at:http://www.magicdraw.com/files/brochures/a4/MagicDrawDataSheet.pdf


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UML Diagrams ?

In software development, the diagram is the equivalent of

a blueprint. To meet the various needs of many parties,

we often need several different blueprints of the same

system.

UML has three main kinds of diagrams:

Static Diagrams: Classes, Objects, data structure

Dynamic Diagrams: show flow of executions and changeof states

Physical Diagrams: source file,libraries, data filesMagicDraw supports the following diagrams defined in

UML1.4:Class diagram, Object diagram, Use case diagram, Statechart diagram,Activity diagram, Collaboration diagram, Sequence diagram, Component diagram,Deployment diagram


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Class Diagram ?

A class diagram is a graphic representation of the static

structural model. It shows classes and interfaces, along

with their internal structure and relationships. Classes

represent types of objects that are handled in a

system.The instances of those types (objects) are

instantiated only on the runtime and are represented by an

object and interaction diagrams.

Classescan be related to each other in a number of ways:

Associated (connected to each other)

Dependent (one class depends/uses another class)

Specialized (one class is a subtype of another class)

Packaged (grouped together as a unit package).


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Class Diagram continue?

A class diagram does not express anything specific about

the relationships of a given object, but it does abstractly

describe the potential relationships of one object to other

objects.A class diagram is the logical map of your existing or

future source code. FIG 1.0 BankAccount Class Diagram

public class BankAccount {

}

BankAccount

-acctId: String-balance: double

+deposit(): void

+withdraw(): double

-calcInterest(): double


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Class Diagram continue?class Bank {

private String city;

private int currentIndex=0;

Privat BankAccount [ ] accounts;

public void add() { }publicBankAccountgetAccount() { }

}

BankAccount


+withdraw(): void

+deposit(): double


Bank

-city: String

-currentIndex:int

-accounts: BankAccount

+add(): void

+getaccount(): BankAccount


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Class Diagram continue?Createa class diagram

All options associated with a class can be set in the Class

Specification dialog box.


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Object Diagram ?Classes represent types ofobjects that are handled in a

system.The instances of those types (objects) are

instantiated only on the runtime.

BankAccount


+deposit(): void

+withdraw(): double


myAccount

-acctId: String

-balance: 30.00

+deposit(): void

+withdraw(): double


Class Object


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State Diagram?Objects change their state as a request in executing amethod.. In general, The behavior of objects of a class

can be described in terms of states and events, using a

state machine connected to the class under construction.A State Machine is a specification of the sequence of

states through which an object or an interaction goes in

response to events during its life

A State Diagram is a graph that represents a state machine

.


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Interface ?An interface is a specifier for the externally-visible

operations of a class, component, or other classifier

(including subsystems) without specification of internal

structure. Each interface often specifies only a limited partof the behavior of an actual class.

interface Creditchecker

{

}

public class BankAccount implements CreditChecker

{

}

interface

Creditchecker

BankAccount


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Abstract classes ?In UML there are two ways to denote that a class or

method is abstract. You can write the name in italics, or

you can use the {abstract} property, both options are

shown below:

public abstract class Accounts

{

private String name;

}

Accounts

name

Accounts{abstract}

name


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Properties?Properties, like {abstract} can be added to any class, they

represent extra information for the class, such as

CustomerAccounts{author=ellie,

Date=20050804,

File=account.java,

Private}


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Association ?An Association between classes often represent instance

variables that hold references to other objects.

public class Bank

{

private BankAccount CustomersAccounts[100];

}

Bank BankAccount

100

CustomersAccounts


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Inheritance ?An inheritance between classes often represent instance

variables that hold references to other objects.

public class BankAccount

{

}

public class SavingAccount extends BankAccount

{

}

public class CheckingAccount extends BankAccount

{}

BankAccount

SavingAccount CheckingAccount


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Override Operations ?Overriding Operation When you inherit classes from the

base class, which has abstract functions, you have to

redefine them in the inherited classes. The implement and

override operations tool will help you generate operations

that are defined as abstract in the base class.

The command Implement/Override Operations command

can be invoked in 2 cases:

When one classifier inherits operations from the base

classifier (Generalization relationship).

When some classifier implements Interface (Realizationrelationship).


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Override Operation continue ?To start the Implement/Override Operations toolFrom the shortcut menu of the selected class,

choose Tools. Then, choose Implement/Override

Operations. The Select Operations to Implement,

Override dialog box appears.


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MagicDrawTools?MagicDrawprovides the following tools and wizards to help

you perform the design tasks in your job quickly and easily: Reports prepares HTML, PDF, or RTF report documents describing the model.

Class Diagram Wizard helps to create and customize new class diagrams.

Package Overview Diagram Wizard generates the package dependency

diagram for packages in your project.

Tools for Analysis prepares diagrams and report documents of the

relationships between classes in the UML model.

Hierarchy Diagram Wizard

Content Diagram Wizard- generates content of diagrams that are used in the project.

Creating Setters / Getters creates getting and setting operators for attributes

defined in the class. Helps in analyzing the class.

Implementing or Overriding Operations creates defined operations down the

inheritance tree. And more


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MagicDrawDemo?MagicDraw Basics demo : MD_viewlets_Basics.exeThis demo introduces the very basics of working with

MagicDraw: shows how to create project and diagrams,

outlines the main working environments, navigates through

elements drawing and presentation options.

Code Generation : MD90_viewlets_Codegeneration.exe

This demo will show you how to perform codegeneration in the MagicDraw UML. You will get acquainted

with source code generation from model and see how model

changes are reflected in the code.


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Information on MagicDraw?http://www.magicdraw.com


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Appendix A.Process of software system modeling:Without UML:

Define problem

Go to whiteboard

Draw high level boxes

Draw flowcharts(show: behaviors and state diagram)

Write High level Specification.

Write functional specification(function name,parameters,..)

Code

Analyze

Build Test

With UML and UML tools such as MagicDraw:

Define problem

..And use UML concept and tools such as MagicDraw to do the rest

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