java-uml-steps.pdf

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Visual Paradigm for UMLGenerate Java source from UML class diagram Eclipse

Tutorial

http://www.visual-paradigm.com/product/vpuml/tutorials/sdeeccodegen.jsp Page 1 of 7

Generate Java source from UML class diagram EclipseWritten Date : January 18, 2010

You can perform round-trip engineering in Eclipse, to keep Java source code and class model in

sync. In this tutorial, we will see how to create a class model and eventually generating source codefrom model.

1. Create a Java project Phone Bookin Eclipse.

2. Right click on the project node in Package Explorer and select Open VP-UML from the popup

menu.
http://www.eclipse.org/


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3. In Diagram Navigator, right click on Class Diagram and select New Class Diagram from the

popup menu.

4. A new diagram is created. You are asked to enter a package header on top of the diagram.

Enter myappand press Enter.

5. You are asked to provide the diagram name. Enter Domain Modeland press Enter.

6. Select Class from the diagram toolbar. Click on the diagram to create a class and name it as

PhoneBook.


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7. We need to create a new class Categorywith association to PhoneBook. Move the mouse

cursor of the class PhoneBook. Press on the resource icon Aggregation->Class.

8. Drag to the right of the class PhoneBookand release the mouse button. Name the new class

Category.

9. Follow the previous steps to create class Contact, associated by class Category.

10. There are two kinds of contact: friend and relative. Create two subclasses from class Contact

through the resource icon Generalization->Class, and name them as Friendand Relative.

The diagram should look like this:


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11. It is time to add attributes to classes. Right click on class PhoneBookand select Add >

Attribute from the popup menu.

12. Enter owner : Stringto name the attribute as owner, and set the type as String.

13. Press Enter to proceed to the next attribute. Enter createDate : java.util.Dateas attribute name

and type. Click on diagram to confirm editing.

Note that the package of type Date, which isjava.util, will not be shown by default. If you want

to show fully qualified name you can right click on diagram background and select Presentation

Options > Type > Fully Qualified from the popup menu.

14. Let's continue with creating operation. Right click on the class PhoneBookand select Add >

Operation from the popup menu.

15. Enter createPhoneBook(owner : String) : PhoneBookto create a public operation

createPhoneBookwith parameter owner, and return an object in type PhoneBook.

16. Follow the previous steps create attribute and operations in the remaining classes as listed

below:

Class Attributes Operations

Category title : String

desc : String

createCategory(title : String, desc : String) : Category

Contact name : String

address : String

age : int

createContact(name : String) : Contact

createContact(name : String, age : int) : Contact


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gender : char

Friend firstMet : String

Relative relationship : String

The diagram should look like this:

17. We almost complete modeling. Let's set the role names. Double click on the Categoryend of

the connector between class PhoneBookand Category. Name the role cats. Set multiplicity

as 0..*. These changes will affect the attribute of category that will be generated in the class

PhoneBook.


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18. Similarly edit the connector between Categoryand Contactby setting the role names of the

two ends to cat and contacts, and multiplicities to 1 and 0..*respectively. This is the completed

diagram.

19. Press Ctrl-S to save.

20. Now comes the code generation. Click on the Update Code button on toolbar.

21. Check the Package Explorer. You should see a list of generated file. You can open them to fill

in the code body.


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22. This is the end of the tutorial. Instead of closing Eclipse now, you may try something more by

editing the code like to add, rename or delete class, attributes and operations, and click the

Update UML Model button, which is the one next to the Update Code button, and observe the

changes that will make in the class model. Enjoy!

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java-uml-steps.pdf