18 Questions
In a Point of Sale (POS) system, what step follows the cashier entering the item identifier?
System records sale line item
What is the purpose of the 'makeNewSale' operation in the POS domain model?
To initialize a new sale instance
Which entity in the POS domain model is associated with the 'enterItem' operation?
Sale
What triggers the system to present the total with taxes calculated in a POS system?
Customer indicates they are done
Which operation in the POS domain model involves 'currentDate(), currentTime(), and nextSaleNum()'?
makeNewSale()
What is the main purpose of the 'Logscompleted' entity in the POS domain model?
To track completed sales
What aspect of the system does an operation contract help identify?
System state changes when an operation happens
What do preconditions in an operation contract describe?
State of objects in the Domain Model before executing the operation
Which section of an operation contract is considered the most important?
Postconditions
What is NOT included in the postconditions section of an operation contract?
Actions to be performed during the operation
What does a domain model help generate when creating an operation contract?
Operation names and parameters
When creating an operation contract, what should be described regarding the system?
State before and after the action, both pre and post conditions
What happens as a postcondition of the 'enterItem' operation?
sli is associated with a ProductDescription based on itemId match
What is an outcome of the 'makePayment' operation postconditions?
's.isComplete' becomes true
What does the 'endSale' operation modify?
's.isComplete'
In the 'enterItem' operation, what is initialized to the input quantity?
'sli.quantity'
What does the 'makePayment' operation associate 'p' with?
'Store'
In the postconditions of 'enterItem', how many associations are created with 'ProductSpecification1'?
None
Test your knowledge on operation contracts in the context of applying UML and patterns based on the concepts discussed in Chapter 11 of Craig Larman's book. Learn about how operation contracts identify system state changes, the significance of system sequence diagrams, and the role of domain models in generating operation contracts.
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