An Introduction to - Chapters) (Download link at the end of this File)

An Introduction to Object-Oriented Programming with Java 5e Thomas Wu

(Solutions Manual All Chapters) (Download link at the end of this File)

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Chapter 1 Solutions

1.1 Graphically represent a Vehicle class and three Vehicle objects named car1, car2, and car3.

1.2 Graphically represent a Person class with the following components:

• Instance variables name, age, and gender.• Instance methods setName, getName, and getAge.• Class method getAverageAge.

1.3 Design a CD class where a CD object represents a single music CD. What kinds of information (artist, genre, total playing time, etc.) do you want to know about a CD? Among the information in which you are interested, which are instance variables? Are there any class variables or class constants?

State Album Name instance variable Artist instance variable Genre instance variable Total Playing Time instance variable Vehicle car3:Vehicle car2:Vehicle car1:Vehicle Person

name

age

gender

setName() getAge() age getGender() gender getAverageAge() average age 2 / 3

Maximum Playing Time class constant

Behaviors getAlbumName(), setAlbumName() instance methods getArtist(), setArtist() instance methods getGenre(), setGenre() instance methods getPlayingTime(), setPlayingTime() instance methods getMaxPlayingTime() class method

Students may also include a list of songs on the CD and methods to access them.A song itself would probably have its own class to represent it. However this concept is more advanced than is necessary at this stage.

1.4 Suppose the Vehicle class in Exercise 1 is used in a program that keeps track of vehicle registration for the Department of Motor Vehicles. What kinds of instance variables would you define for such Vehicle objects? Can you think of any useful class variables for the Vehicle class?

Instance variables owner licenseID registrationNumber make model color value

Class variables At this stage, the number of total vehicles could be thought to belong to the class. Information relating to the length of a licenseID or registrationNumber could be stored as class constants. Aside from these, there are no obviously necessary traits for which all vehicles share the same value or which the class may need to function.

1.5 Suppose the following formulas are used to compute the annual vehicle

registration fee for the vehicle registration program in Exercise 1.4:

• For cars, the annual fee is 2 percent of the value of the car.• For trucks, the annual fee is 5 percent of the loading capacity (in pounds) of the truck.Define two new classes Car and Truck as subclasses of Vehicle.

Hint: Associate class and instance variables common to both Car and Truck to

Vehicle.

Vehicle Class See Exercise 1.4

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