Reviews : Java Books :
Beginning Java Objects : Chapters 2 and 3

Buy this book Title: Beginning Java Objects ISBN: 1861004176 US Price: $ 39.99 Canadian Price: C$ 59.95 UK Price: £ 28.99 Publication Date: November 2000 Pages: 800 © Wrox Press Limited, US and UK.

Data/State/Attributes

• The student's name
• His or her student ID and/or social security number
• The student's birthdate
• His or her address
• The student's designated major field of study, if the student has declared one yet
• His or her cumulative grade point average (GPA)
• Who the student's faculty advisor is
• A list of the courses that the student is currently enrolled in this semester (a.k.a. the student's
current course load)
• A history of all of the courses that the student has taken to date, the semester/year in which each
was taken, and the grade that was earned for each: in other words, the student's transcript

• The course number (for example, 'ART 101')
• The course name (for example, 'Introductory Basketweaving')
• A list of all of the courses which must have been successfully completed by a student prior to
allowing that student to register for this course (i.e. the course's prerequisites)
• The number of credit hours that the course is worth
• A list of the professors who have been approved to teach this course

An object's attribute values, when taken collectively, are said to define the state, or condition, of the object. For example, if we wanted to determine whether or not a student is 'eligible to graduate' (a state), we might look at a combination of:

• The student's transcript (an attribute), and
• The list of courses they are currently enrolled in (a second attribute)

A given attribute may be simple — for example, 'GPA', which can be represented as a simple floating point number, — or complex — for example, 'transcript', which represents a rather extensive collection of information with no simple representation.

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