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The State of Status
Copyright © 1999 Patrick McDermott
UC BerkeleyExtension
pmcdermott@msn.com
Etymology
• State• Status
• Mode
State vs. Value
• State same as value?• Bank account with $123,456 different
STATE than $123,457?
State
• Coke Machine• Not for each amount: price changes, so does
state diagram; Yen dif from $ • 2do: Graphix
Course
• Tentative• Under-enrolled• Open• Closed• Cancelled
Order
• Placed• Pending• Filled• Closed
Employee
• Prospect• Applicant• Candidate• Employee• Retiree
2, not 1
• Paid• Fulfilled
Task
• Created• Assigned• Closed
– no more hours
Assumed Serial State
• Order of an Order• DMV
• See Note Page
Questions
• Can they be separate classes?– Different Enough?
• Can you swim upstream?• Can you Re-Open?
– Re-start– Different then?
Employee
• Prospect• Applicant
Separate Class
PROSPECT
APPLICANT
EMPLOYEE
RETIREE
Generalization
PROSPECT APPLICANT CURRENT RETIREE
EMPLOYEE
Status Attribute
EMPLOYEE
StatusCode: char
Status CodesP – ProspectA – ApplicantE – EmployeeR – Retiree
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