东北大学需求分析Assignment2solution资源-CSDN文库

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Task 6 (3 marks)

Develop a class diagram corresponding to your sequence diagram from Task 5. Show

only operations in classes (specify names of operation’s arguments and return types).

Show constructors for classes that were instantiated in Task 5. Specify relationships

between classes (use uni-directional associations unless the interactions from Task 5

suggest both-directional communication). Show visibility of operations. Describe the

meaning of the model, including any assumptions you have made, in text under the

diagram.

Task 6 Answer:

The class model is a direct transformation of information present in sequence/collaboration model

for Task. The only additions relate to the visibility and to return types of operations. Operations

that are internally called by an object are given private visibility (as they are called within the

same class).

The login() operation in PKioskLogin returns Boolean, although the client class is in fact an actor

(Academic). In practice, login() will not return void, but it will invoke an error function if the

login’s validation() is not successful. Operations in other classes called by Academic return void,

as expected. The reason for this misalignment is strictly of educational nature.

Task 7 (3 marks)

Describe the definitions and differences between desktop clients and browser clients.

And Give a GUI design for both desktop client and browser client.

MMediator

save(form) : Boolean

PKioskLogin

login(name, psswd) : Boolean

validate(name, psswd) : Boolean

PKioskEntry

PKioskEntry(loginName)

getPayMethod() : void

PPayMethod

PPayMethod(loginName)

modify(option) : void

displayEntryForm() : void

saveChanges() : void

refreshForm() : void

EPayMethod

getExisting(loginName) : EPayMethod

CModifyPayMethod

getExisting(loginName) : EPayMethod

save(form) : Boolean

FWriter

updateDatabase(sql) : Boolean

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