1. UML Diagramming with Astah*
Java UML Development Environment
UML Diagramming with Astah*
Using Astah
September 19, 2018

2. Astah – First Opened
Using Astah
September 19, 2018

3. Create a New Project
Using Astah
September 19, 2018

4. Add a Diagram
Choose Class Diagram
Using Astah
September 19, 2018

5. New Class Diagram
Using Astah
September 19, 2018

6. Give Diagram a Name New Name New Name New Name Type new name here
Using Astah
September 19, 2018

7. Add a Class to the Diagram
New class diagram added. Give it an appropriate name.
Click this button to add a class
New class
Then click here to place it
Using Astah
September 19, 2018

8. Click to work with attributes
Add Attributes
Click to work with attributes
Using Astah
September 19, 2018

9. Add New Attribute
Fill in the Name, Type, and Visibility of the Attribute
Click Add to add an attribute
Using Astah
September 19, 2018

10. If the desired type is not in this list, just type it here.
New Attribute
If the desired type is not in this list, just type it here.
Using Astah
September 19, 2018

11. Editing Attribute To edit the selected attribute’s features
Change these characteristics as needed
Using Astah
September 19, 2018

12. Add Methods to the Class
Methods are called Operations in Astah
Add, Edit, or Delete Methods as Desired
Using Astah
September 19, 2018

13. Adding and Editing Parameters
To add or edit parameters
Using Astah
September 19, 2018

14. After adding the methods
Using Astah
September 19, 2018

15. Add a second class After renaming new class and adding the main method
Add a class in same way as first
Using Astah
September 19, 2018

16. Showing Dependency Relationship
Use this button to draw a dependency relationship – also called instantiation relationship
Using Astah
September 19, 2018

17. Showing Dependency Relationship
Driver and Drag to Circle
Result shows that CircleDriver creates and uses one or more Circle objects
Using Astah
September 19, 2018

18. Labeling the Dependency Line
Line is now labeled
Click on the Dependency Line to Select it. Then choose the Stereotype tab and type the label you want
Using Astah
September 19, 2018

19. Save the diagram – extension will be .asta
Resulting Diagram
May print the diagram
Save the diagram – extension will be .asta
Using Astah
September 19, 2018

20. Class Diagram Background Color
Change background color for a selected class diagram by clicking this button and then choosing the desired color
Using Astah
September 19, 2018

21. Zooming Zoomed In Fit in Window Zoom In Zoom Out Using Astah
September 19, 2018

22. Adjusting Alignment and Spacing
Using Astah
September 19, 2018

23. Class Relationships and UML Connectors
Instantiation, Aggregation, and Composition
Using Astah
September 19, 2018

24. Class Relationships
An object of one class may use an object of another class to do some part of its work
A Student object may use a Computer object to complete some Assignment objects
A Hand object has 5 Finger objects
A Ship object has one or more Propeller objects
A MovieCollection may consist of many Movie objects
A Doctor object has Patient objects
A HumanBody has a Head
A Mechanic may use a Wrench object to loosen a Nut
Using Astah
September 19, 2018

25. Several Types of Relationships
Instantiation – a method of an object may instantiate and use an object of another class to do a specific task but the object being used is not a fundamental part of the object using it
A Carpenter uses a Nail to fasten 2 boards together
A Seamstress uses a Needle and Thread
A Dog gnaws on a Bone
Typically, a method of one class (say A) instantiates and uses an object of another class (say B) but the object of B is not a part (attribute) of A
Using Astah
September 19, 2018

26. Implementing the Instantiation Relationship
Typically, this relationship is implemented in Java code with a client method in the user class, say class A, instantiating an object of the other class, say class B, and then calling one or more methods of B on that object. In UML:
Instantiates and Uses Connector
Class Relationships
September 19, 2018

27. Sample Code Skeleton
A method in class Carpenter instantiates an object of class Hammer and then uses it.
Instantiation/Uses can also be implemented by passing an object of class Hammer to a method of class Carpenter and using it.
Class Relationships
September 19, 2018

28. Has-A Relationships
If an object of one class (say A) has a component (attribute) that is an object of another class (say B), we say Class A has a “Has-A” relationship with Class B.
Also called a Part-Whole Relationship
A HumanBody has-a Head
A Student has-a Computer
A DeckOfCards has-a collection of Card objects
A Car has-a Motor
A ClassRoom has-a set of Chair objects
A Student has-a Advisor
The key point is that the object of B is an attribute of A.
Using Astah
September 19, 2018

29. Two Types of Has-A Relationships
In some Has-A relationships, the relationship is essential and the constructor of one class instantiates an object of the other class
A Hand has Fingers
A Person has a Head
A Car has a Motor
The Person is not a Person without its Head and the Car is not a complete Car without its Motor
This type of Has-a (Part-Whole) relationship is called Composition
Using Astah
September 19, 2018

30. Indicates a House object has exactly one Roof object, named roof
Composition
One class is partially or fully composed of objects of other classes
In the diagram, class House has (or contains) one object roof of type Roof
The class acting as the whole (House) maintains a reference (or references) to an object(s) of the class that is acting as the part (Roof)
The difference between this and aggregation is that the part is instantiated when the whole is instantiated. The house and the roof come into existence together (in the constructor for the House)
Indicates a House object has exactly one Roof object, named roof
This type of arrow indicates that the roof is an integral component of the house
Class Relationships
September 19, 2018

31. Drag it FROM House TO Roof …
Composition in UML
Select the Composition Arrow in Astah* and Drag FROM the whole (House) TO the part (Roof)
Drag it FROM House TO Roof …
Select this symbol
… to get this
Class Relationships
September 19, 2018

32. The “part” is always created when the “whole” is created
Composition
The “part” is always created when the “whole” is created
Because the Roof/House cannot exist without the other, the House constructor creates its own Roof – and the Roof object exists as long as the House object does
Class Relationships
September 19, 2018

33. Aggregation
Aggregation is a type of a Has-a relationship in which one object Has-a object of another class as an attribute, but that object is not essential to the existence of the other, and it is not instantiated by the constructor of the other
A Student is still a Student without a Computer
A ClassRoom is still a ClassRoom even if one removes its Chairs
A Person is still a Person even if he/she loses his/her Coat
Using Astah
September 19, 2018

34. Aggregation
In the aggregate relationship, one class aggregates objects of the other class
In the diagram, class Room has (or contains) zero or one objects of type Chair
The class Room, acting as the whole, maintains a reference (or references) to an object(s) of the class Chair that act as the part
There are usually one or more methods (that may or may not ever be invoked) that instantiate one or more instances of the part
Reference name
This type arrow indicates the aggregation relationship
Between 0 and 1 instances of a Chair
Class Relationships
September 19, 2018

35. Aggregation in UML
In Astah*, the aggregation relationship is indicated as shown here:
Select the Aggregation Symbol
Use this dropdown …
Tooltip helps one select the proper symbol
… to get this list
Class Relationships
September 19, 2018

36. Arrow is the result of dragging FROM the Room class TO the Chair class
Aggregation in astah*
Drag the selected arrow FROM the “whole” (Room) TO the “part” (Chair)
The PART
The WHOLE
Arrow is the result of dragging FROM the Room class TO the Chair class
Class Relationships
September 19, 2018

37. Aggregation: code skeleton
The Room has an attribute reference to a Chair object
Room instantiates a reference to an object of type Chair – initially null
Some method in Room associates the Room object with an actual Chair with the reference named chair
Note that the Room object exists (and is initialized by the Room constructor – not shown) and the Chair object that is passed to the setChair method exists separately. The Chair becomes a real part of this Room only when this method is invoked
Class Relationships
September 19, 2018

38. Use this connector to an enumerated data type
Enums in UML - Example
Use this connector to an enumerated data type
Using Astah
September 19, 2018