Problem Set 4

CMP 326: Programming Methods II
Lehman College, City University of New York
Spring 2014

This problem set covers material from Chapters 5 and 6.

It should be finished by Thurs. March 6, however you may submit it up until the end of office hours on Thurs. March 18. To submit a program, you need to demonstrate (during office hours or class) your program and explain how it works. You may submit a program multiple times.

General guidelines:

• Tell the user what any output means. Don't assume that they know what the program does.
• Practice using Java conventions (i.e. variable names look like thisIsAVariableName, etc) when writing your code
• You may use either a keyboard scanner or a GUI to ask the user for input and return the output.

Problems

1. MotorBoat Class (25 points)

   Exercise 5.7 (p 359): Implement a class MotorBoat that represents motorboats. A motorboat has attributes for:

   • The capacity of the fuel tank
   • The amount of fuel in the tank
   • The maximum speed of the boat
   • The current speed of the boat
   • The efficiency of the boat's motor
   • The distance traveled
   The class has methods to
   • Change the speed of the boat
   • Operate the boat for an amount of time at the current speed
   • Refuel the boat with some amount of fuel
   • Return the amount of fuel in the tank
   • Return the distance traveled so far
   If the boat has efficiency e, the amount of fuel used when traveling at a speed s for time t is e x s^2 x t. The distance traveled in that time is s x t.

   Include a driver program that instantiates several objects of type MotorBoat and demonstrates the class.

2. PersonAddress Class (20 points)

   Exercise 5.8 (p 330): Implement a class PersonAddress that represents an entry in an address book. Its attributes are:

   • The first name of the person
   • The last name of the person
   • The email address of the person
   • The telephone number of the person
   It will have methods to
   • Access each attribute
   • Change the email address
   • Change the telephone number
   • Test whether two instances are equal based solely on name
   Include a driver program that instantiates several objects of type PersonAddress and demonstrates the class.

Submitting Your Problem Set

You should submit all problems for grading by the deadline (see class schedule for date). To submit a program, you need to demonstrate (during office hours or lab) your program and explain how it works.