SE-1011 Software Development 1
Lab 9: Bio-data Analyzer

Objectives

• Implement Java classes.
• Incorporate conditional control statements, such as if and switch, into a Java program to affect program control flow.
• Implement for, while, and do-while iteration statements to repeatedly execute sections of program code.
• Use arrays to hold large sets of data.

Assignment

In this lab, you will write a program that uses a pre-written FileReader class to read a large amount of integer data from a file. Once read, you'll place the data into an array, plot it, and compute various metrics on the data.

Assume that this data is a heartrate history acquired by an exercise machine (each value represents heartbeats/second). You are to

• graphically display the heartrate as a function of time, by means of a WinPlotter window, within a grid, and adjusting the color of the output depending upon whether a specific heartrate value is:
  • within a specified "normal" range (Green)
  • below the "normal" range (Blue)
  • above the "normal" range but below the "aerobic threshold" (Orange)
  • over the "aerobic threshold" (Red)
     
• draws a green horizontal line at the low value of the "normal" range
• draws an orange horizontal line at the high value of the "normal" range
• draws a red line at the value of the "aerobic threshold"
   
• computes and displays (Yellow)
  • the average heartrate
  • the minimum heartrate
  • the maximum heartrate
  • the percentage of the time the heartrate was within the "normal" range

Your program will consist of several classes; you have to write only one of them. The BioProgram class (to be put in the msoe.se1011.<yourname> package) that you will write contains the main() method and handles all dialogs that get input from and presents output to the user.

Detailed requirements

When completed, your program should function according to the following sequence of steps, with substantially similar UI:

1) begin by posting a welcome dialog to the user (from with your BioProgram class):

2) your program should prompt the user for the file containing heartrate data, such as data.txt

:

3) Prompt the user for the lower range of the target (normal) heartrate zone:

4) Prompt the user for the upper range of the target (normal) heartrate zone:

5) Prompt the user for the aerobic threshold heartrate:

 

After each of steps 3, 4, and 5, you should make sure that the input values for the various heartrates are valid; that is, not null, non-blank, and non-negative.  As in previous labs, you need to use conditional logic to check this, and when detected, inform the user of the error and exit (if null, meaning Cancel was pressed) or repeat the prompt for the value.

Use the supplied FileReader.java class (do not modify this code!) to read the heartrate data from a specified file  Process the information (calculate average heartrate etc) after you store the data into an array of int's. You can download this Example.java program that shows how to use the FileReader class to read data from a specified file.

Make sure you use the FileReader's getStatus() method after reading the file. If you don't get the DATA_READ_OK value back from getStatus(), you should display an error message to the user rather than displaying a graph in the WinPlotter window.

6) Generate a Color-coded graphical display of the data (you get the following display if you use the supplied data file), including the summary of results as shown (note that the values used for lower limit, upper limit, and aerobic threshold were 125, 150, and 165, respectively).

Test your program and make certain that it works correctly. The format of the file containing the heartrate information is very simple: it's just a text file where each line contains a single heartrate value. You can easily create your own files that allow you to input known values such that you can verify the results of your computations. For example, with a file containing only 10 values (say between 20 and 50), you can easily hand-calculate the average of those values and percent of values between, say, 25 and 35.

Lab Submission (due date in WebCT)

Submit your assignment following these instructions:

1. You do not need to hand in a flowchart, but you may find it helpful to create one before you start coding.
2. Upload your BioProgram.java file through WebCT (assignment "Lab 9: Bioanalyzer").

Your grade will be based on the following criteria:

• Meeting requirements; your program must compile and run. If you have trouble, you must come to see me. If you don't and you submit a program that does not compile or produce meaningful results will receive a grade of no higher than 50, even after reworking your program.
• Technical quality of your program. Technical quality consists of formatting, commenting, and following coding style guidelines I have been telling you about in class and in grading comments in your previous labs.
  • Every conditional test must be fully commented to let the reader know what you are doing in the case where the if condition is satisfied, as well as the case where the else or else if condition is satisfied instead.
• Spelling and grammar (Eclipse even has a built-in spell checker - make use of it!)
• Timeliness of submission as stated in the course policies.