In this lab you will practice using a UML diagram tool to create class and sequence diagrams.

The tool, called Violet, is written by Cay Horstmann, our textbook author.

Here is a link to Horstmann's Violet information page: http://horstmann.com/violet/

• Violet comes as an executable Java archive file which you can download here: violet.jar
• You must have Java installed on your machine.
• On some operating systems you can launch Violet by double-clicking its icon. If that doesn't work for you, open a command window, change to the folder where your violet.jar file is located, and run the command:

      java -jar violet.jar
            

  You should see a screen that looks like:

  

This section describes basic operations for class diagrams in Violet, such as creating a new diagram and manipulating its parts.

This short overview is not a complete description of Violet; it is just intended to get you started.

Select File > New > Class Diagram to create a new drawing area laid out in a grid. Note the diagram tools arrayed to the right of the drawing area window:

Click to select the "Class" tool. Any time a tool is selected, that is the type of diagram component (whether it is a class, relationship arrow, etc.) that will be created when you click again.

Locate a place in the window where you want to put a node (class icon), and click there. An empty rectangle will appear. You can move the node around by dragging it with the mouse. If you right-click in the rectangle you get a Properties dialog that will allow you to enter a class name, attributes, and methods.

Experiment until you get two nodes that look like this:

Since a team is an aggregate of players, select the "Is an aggregate of" tool, click anywhere in the Team class, and drag to anywhere in the Player class. If the classes occupy the same horizontal strip within the diagram, you will get an edge (connecting line) like:

Click the Select tool and drag the Player class icon down an inch or two:

All edges have a bentStyle property that defines the style of the edge.

The bentStyle of our edge is currently HVH (horizontal-vertical-horizontal).

You can control the bentStyle of an edge by right-clicking on it to get the edge's property editor:

Here the edge's bentStyle property has been changed to VH (vertical-horizontal; the vertical emanates from the origin class icon, which is Team):

Violet will attempt to maintain the bentStyle properties of an edge as you move associated nodes around:

You can use an edge's property editor to indicate the class multiplicities for the nodes that it connects:

You can add notes to a diagram by selecting the Note tool and clicking anywhere in the diagram.

Then, right-click on the note icon to get the note's property editor.

Finally, select the Note connector tool to connect the note to some aspect of the diagram:

Your job is to create a class diagram and sequence diagram as described in this section.

Create a class diagram that looks exactly like the one below, except that <YOUR NAME HERE> is replaced by your name.

Save your diagram as CS2511_Lab_3. Violet will actually create the file CS2511_Lab_3.class.violet. (Do not export the diagram to an image file.)

Submit your CS2511_Lab_3.class.violet and CS2511_Lab_3.sequence.violet files in a folder zipped with the name your-login-LEX3.zip.

Email the zip file to your TA. Note that the grader will open your diagram in Violet.

• Class Diagram: 5 points
• Sequence Diagram: 5 points