Academic Year: 2014-2015
Second Semester
Software Engineering Department
Software Modeling (721222) Course
Section:2
Student Name:
Student Number:
ClassWork2
A library contains a lot of books. Each library book has many copies
Class : Library Book
.
Purpose : Book copy Lending
1.
Find out a property relevant to this class whose value is variable.
Answer:
Number-of-Available-copies
2.
Use abstraction on the possible values of this property to find out two abstract Library
Book states.
Answer:
Number-of-Available-copies >0 (Borrowable)
Number-of-Available-copies == 0 (Not borrowable)
2.
Find out two relevant events that affect the behavior of the Library Book class.
Answer:
borrowed
returned

3.
Draw the table that links the states and events found out in precedent questions.
Sates- Events Borrowable Not Borrowable borrowed returned
Borrowable | [Not last
Copy]
Not Borrowable | [Last
Copy]
Borrowable Borrowable
4. Draw the state diagram that describes the behavior of the Bank Account Class