Extra Credit Project 1 - Solve Times

CPE 103


The webmaster of www.quotepuzzles.com has hired you to write a Java program to process some data he has gathered from users who visit his website.

You are given a text data file that contains a large number of records.  Each record (line of the file) has two fields, separated by a semicolon.  The first field is the IP address of someone who visited the website.  The second field is the number of seconds that person spent solving a puzzle using an interactive applet on the site. For example, the first few lines of the file are:

129.65.17.135;67
24.17.9.139;217
199.243.168.134;427
199.243.168.134;966
199.243.168.134;518
69.111.244.226;100
24.17.9.139;259

This data shows that visitor 24.17.9.139 solved two puzzles; the first one in 217 seconds and the second in 259 seconds.

You are to write a program to read the data file and compute the IP address of the visitor with the fastest average solving time.   (You may assume there will be exactly one fastest time.)

For example, assuming that visitor 199.243.168.134 appears only three times in the file, their average solving time would be 427 + 966 + 518 / 3 = 637.

Also compute the number of puzzles solved by the fastest solver.

Since the data file contains confidential information, the file will remain in the possession of the instructor.  You must construct your own test data to test your program. 

Class Design


Your class must be named  SolveTimes  and must contain the following public methods:
    public void findWinner(InputStream streamIn) - process the input data.
    public String getWinner() - return the IP address of the winner.
    public double getAverage() - return the average solving time of the winner.
    public int getSolvedCount() - return the number of puzzles solved by the winner.
    public static void main(String[] args) - run the application, accepting the name of a data file as the command line argument.

Unit Testing


Here is an example unit test:

import java.io.*;
public class ExampleTest extends junit.framework.TestCase
{
    public void testWithSmallFile()  throws FileNotFoundException
    {
        SolveTimes app = new SolveTimes();
        FileInputStream fs = new FileInputStream(new File("data.txt"));
        app.findWinner(fs);
        assertEquals("Incorrect winner","19.234.56.789",app.getWinner());
        assertEquals("Incorrect average",71.3,app.getAverage(),0.1);
        assertEquals("Incorrect solved count",7,app.getSolvedCount());
    }
}


Submission


You may submit your work either of two ways:
  1. (Preferred) Bring your source code to the instructor's office hours and you can demonstrate it with the instructor's test data.
  2. (Alternate, if office hours are busy) Submit it via Web-CAT.  You will need to submit any data files needed by the junit test to Web-CAT in a zip file along with your source code and unit test files.
  3. Submit your time log either during office hours or at a regular class meeting.
This assignment is worth one-third of a regular project in extra credit points.