How to extract class diagram from use case description from a system? [closed]

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http://www.iraqup.com/up/20120410/0iBvE-M60l_102420431.GIF

Here is an image for a system used in X company and the use case for it is (List Department’s Employees). The administrator identifies the department ID number. The system displays all employees in that department.

For this question you should use a scenario based on a single department represented by an object department7 which has a number of employees represented by the objects employee3, employee6, and employee11) and we need to draw object diagram and a sequence diagram.

I used UML use case diagrams and what should I do to understand this from scenario

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The object diagram

Answer 1

It looks like a class diagram. What is there to extract?

The tool which allowed you to create the diagram should have source code generator. I used Enterprise Architect some time back--it was good.