Name:_____________________________ Section:______
CIS 120-101 Fall 2007
Programming Assignment 9
Due: Week 16 (Tue 12/4/07)
Description:
Design and implement two Java classes one called “Taxi”, one called Fleet (one called Program9 will be supplied to
you). Put these into 3 separate files. The Taxi class should support: a toString() method to display the service name
and rate data [just as you did in Program8]. It should also supply an instance method that returns a double that is the
computed cost of a ride for a given distance based on the particular Taxi [just as you did in Program 8]. Taxi should
obviously have a constructor [just like in Program 8]… Taxi should also support a getServiceName instance method
that returns the name of the given service since that instance variable will be private. hmmm it looks like most of
your code from Program8 for Taxi should work here (except of course with the driver portion of it removed). The
Fleet class will :”have a” array of Taxi services where that Fleet constructor takes a single String as its argument
(namely the name of the text file that holds the data need to initialize the Fleet’s array of Taxis). See a sample of
what that file might look like below. The first line of the text-file will hold an integer that tells you how many
services (potentially) will be contained in the rest of the text file [you may assume that the number stated on line 1
of the file is accurate with respect to the number of lines to follow] . Each of the other lines in the file will contain
data about a single Taxi service in a format called comma-delimited (I,e, a comma separates the first data field from
the second and the second from the third). Note that the Service names might have un-needed leading or trailing
spaces that you should remove and they may need a fix to their capitalization. The first letter of each word should
be capitalize [all others should be left as is]. Thus in example below “mellow cab” should become “Mellow Cab”,
“speedy” should become “Speedy”, “allStar” should become “AllStar”, and “Step-on-it” should be left exactly as is.
Hint words start in col. 1 after trimming or they have a space in front of them. If a given line does not have exactly
2 commas in it your constructor for Fleet should produce an error message identifying the line number and text of
the bad line and should then continue onward ignoring that line. Note: you will need to track “lastInUse” for your
array since the first line tells you how big the array MIGHT be (if no lines are rejected). The Fleet class should also
have its own toString method that will display (one per line) the data from each individual Taxis in the Fleet. [Hint:
it should use the toString from Taxi!] The Fleet should have an instance method [much like some code from
Program8] that finds the best fare for a given distance (ie it returns a double) and takes a double as an argument [call
this one bestFareAmount]. Fleet will have another instance method that returns a Taxi (actually a Taxi object
reference) called bestFareTaxi( that works just like bestFareAmount except that it returns a reference to the Taxi
service that offers that best fare for the given int number of miles. Fleet should also offer an instance method called
howBig that returns the number of Taxis in the Fleet (5 in the case of the code shown below). The Fleet should also
support an instance method called getServiceNames that returns an array of Strings, namely the names of each of the
services in the array of Taxis. And finally, Fleet should offer a method called saveFleetData that will take a String
as an argument (namely the pathname of the file to which the Fleet data is to be saved). The fleet data should be
saved as a text-file with the following format: line 1 will be an int (the number of Taxis to follow – 5 for the sample
input below) followed by the numbered toString output produced by each of the Taxis in the Fleet. An example of
part of that output is shown below.
Sample of what input file to be used might look like:
6
mello cab ,0.45,2.50
speedy ,0.50,1.85
, // bogus line here should lead to error message.
a+, 0.55,1.75
allStar,0.85,0.00
Step-on-it, 0.52,1.80
Sample first three lines from text-output file produced:
Taxi Services in the Fleet: 5
1. Mellow Cab’s fare per mile is $0.45 with an initial charge of $2.50
2. Speedy’s fare per mile is $0.50 with an initial charge of $1.85
