Writing Classes - Java Software Solutions: Foundations of Program Design - page 161

Class Attributes Operations

Set address
Set major
Compute grade point average

Student Name

Address
Major
Grade point average

Rectangle Length

Width
Color

Set length
Set width
Set color

Aquarium Material

Length
Width
Height

Set material
Set length
Set width
Set height
Compute volume
Compute filled weight

Flight Airline

Flight number
Origin city
Destination city
Current status

Set airline
Set flight number
Determine status

Employee Name

Department
Title
Salary

Set department
Set title
Set salary
Compute wages
Compute bonus
Compute taxes

FIGURE 4.1 Examples of classes and some possible attributes and operations

SELF-REVIEW QUESTIONS (see answers in Appendix N)
SR 4.1 What is an attribute?

SR 4.2 What is an operation?

SR 4.3 List some attributes and operations that might be defined for a class

called Book that represents a book in a library.

SR 4.4 True or False? Explain.

a. We should use only classes from the Java standard class library
when writing our programs—there is no need to define or use
other classes.
b. An operation on an object can change the state of an object.
c. The current state of an object can affect the result of an operation
on that object.
d. In Java, the state of an object is represented by its methods.