Java程序辅导

COMP5028 Object Oriented Analysis and Design  Semester 2, 2004 
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Laboratory session Eight  
Storie Dixson 432 A,B 
Wednesday Sep 22, 2004 
School of Information Technologies 
The University of Sydney 
SOLUTION 
Objective 
• Practice the Test-driven development 
• In Week 7 and week 8 lecture, we introduced a payroll case study. Seven major use cases 
have been identified as the goal of the deliverable in this iteration. We have done initial 
analysis and realized a few use cases in the lecture. Several Java code fragments have 
been given as well. Your objective this week is to realize two more use cases, and to 
refine the design object model accordingly.  
Tasks 
A. Draw a static and dynamic model for Delete Employee use case. List detailed 
attribute and operations in the concrete transaction class. 
 
Name: Delete an Employee 
Actor: Clerk 
Basic flow of event 
1. Clerk input the employee ID he(she) wants to delete 
2. System find the employee and delete it 
Alternative flow 
     2a. if the employee ID is not a valid one, system prompt an error message 
Postcondition: the appropriate employee record is deleted 
COMP5028 Object Oriented Analysis and Design  Semester 2, 2004 
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Figure 1. Static and dynamic model for delete employee use case 
 
B. Draw a static and dynamic model for “Post Time Card” use case. List detailed 
attributes and operations in the concrete transaction class. 
 
Name: Post Time cards 
Actor: Employee (Clerk) 
Basic flow of event 
1. Clerk input the employee ID, date and number of hour the employee worked  
2. System find the employee  
3. System creats a TimeCard class and associate with the employee object 
Alternative flow 
     2a. if the employee ID is not a valid one, system prompt an error message 
     2b. if the employee is not hourly employee, system prompt an error message 
Postcondition: the timecard is created and associated with the employee 
COMP5028 Object Oriented Analysis and Design  Semester 2, 2004 
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COMP5028 Object Oriented Analysis and Design  Semester 2, 2004 
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C. Refine the object model in week 8 lecture Figure 8.12 by adding all known attributes 
and operations to those entity classes, you need to add a few more entity class as well