To provide integration with UML we will use the plugin Omondo EclipseUML, which is a visual modeling tool that supports the creation of UML diagrams, reverse engineering and other functions. If you don't have it you can download the free version from the site www.omondo.com.

Once installed, follow these steps:

1) Using the EclipseUML tool, create a Class Diagram for the classes you created in the last laboratory assignment (Complex and Fraction) and the interface BasicOps. Include the classes Number and Object in the appropriate places.

2) Compile and run the generated classes. Did you prefer using UML for creating the files or the code editor? Why?

3) Now, select the project where the code for the classes Fraction and Complex is. Generate automatically a Class Diagram for the two classes and for the interface BasicOps.

4) Define a new interface called FourOps:

    public interface FourOps {

        // Add a number to this number
        public void add(Number a);

        // Subtract a number from this number
        public void sub(Number b);

        // Multiply a number to this number
        public void mult(Number a);

        // Divide this number by
        public void div(Number b);

    }

Declare that Complex and Fraction implement the FourOps interface using the EclipseUML tool. After this, generate the code and finish the coding using the editor.

5) Which interface is better? BasicOps or FourOps? Why?

6) Which was easier to implement? Why?

Hand in all material you created.