Project #4 Solution

This programming project involves writing a program to manage a student database. The interface to the program should be a GUI that looks similar to the following:







A combo box should allow the user to select one of the four database actions shown. The database should be implemented as a HashMap, with the ID field as the key and a student record consisting of a name and major as the value. The operation should be performed when the user clicks the Process Request button. If the user attempts to insert a key that is already in the database an error message should be displayed using a JOptionPane message dialog box. If the user attempts to delete, find or update a record that is not in the database, a message should also be displayed. After each successful operation is completed a JOptionPane window should be displayed confirming the success. In the case of a successful Find request, a window should pop up containing the student's ID, name, major and current GPA. When the user selects the Update request, the following JOptionPane windows should be displayed to gather information about a course that has just been completed:







This program must consist of two classes.




The first class should define the GUI and handle the database interactions.



The second class named Student, should define the student record. It must have instance variables for the student name, major and two variables that are used to compute the GPA. A variable that contains the total number of credits completed and a second variable that contains the total quality points, which are the numeric value of the grade received in a course times the number of credit hours. It should not contain the student ID. The class should have the following three methods:



A constructor that is used when new student records are created. It should accept the name and major as parameters and initialize the fields that are used to compute the GPA to zero.



The second method courseCompleted should accept the course grade and credit hours and update the variables used to compute the GPA. It will be called when an Update request is made.



The third method should override toString and return a labeled string containing the student name, major and GPA.



Finally when a student has not yet completed any course, the GPA should be displayed as 4.0.




The google recommended Java style guide, provided as link in the week 2 content, should be used to format and document your code. Specifically, the following style guide attributes should be addressed:




Header comments include filename, author, date and brief purpose of the program. In-line comments used to describe major functionality of the code.




Meaningful variable names and prompts applied. Class names are written in UpperCamelCase.




Variable names are written in lowerCamelCase. Constant names are in written in All Capitals.




Braces use K&R style.




In addition the following design constraints should be followed:




Declare all instance variables private Avoid the duplication of code




Also any exceptions thrown by nonnumeric inputs should be properly handled




Test cases should be supplied in the form of table with columns indicating the input values, expected output, actual output and if the test case passed or failed. This table should contain 4 columns with appropriate labels and a row for each test case. Note that the actual output should be the actual results you receive when running your program and applying the input for the test record. Be sure to select enough different scenarios to completely test the program.




Note: All code should compile and run without issue.










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Submission requirements




Deliverables include all Java files (.java) and a single word (or PDF) document. The Java files should be named appropriately for your applications. The word (or PDF) document should include screen captures showing the successful compiling and running of each of the test cases. Each screen capture should be properly labeled clearly indicated what the screen capture represents. The test cases table should be included in your word or PDF document and properly labeled as well.




Submit your files to the Project 4 assignment area no later than the due date listed in your LEO classroom. You should include your name and P4 in your word (or PDF) file submitted (e.g. firstnamelastnameP4.docx or firstnamelastnameP4.pdf).










Grading Rubric:




The following grading rubric will be used to determine your grade:




Attribute
Meets
Does not meet
GUI Class
40 points
0 points


Defines the GUI.
Does not defines the GUI.


Provides a combo box to allow
Does not provide a combo box


the user to select one of the
to allow the user to select one


four database actions including
of the four database actions


insert, update, delete and find.
including insert, update, delete




and find.


The database is implemented as




a HashMap, with the ID field as
The database is not


the key and a student record
implemented as a HashMap,


consisting of a name and major
with the ID field as the key and


as the value.
a student record consisting of a




name and major as the value.


The operation is performed




when the user clicks the Process
The operation is not performed


Request button.
when the user clicks the Process




Request button.


If the user attempts to insert a




key that is already in the
If the user attempts to insert a


database an error message is
key that is already in the


displayed using a JOptionPane
database an error message is


message dialog box.
not displayed using a




JOptionPane message dialog


If the user attempts to delete,
box.


find or update a record that is






If the user attempts to delete,




find or update a record that is



3



not in the database, a message
not in the database, a message


is displayed.
is not displayed.


After each successful operation
After each successful operation


is completed a JOptionPane
is completed a JOptionPane


window is displayed confirming
window is not displayed


the success.
confirming the success.


In the case of a successful Find
In the case of a successful Find


request, a window pops-up
request, a window does not


containing the student's ID,
pop-up containing the student's


name, major and current GPA.
ID, name, major and current




GPA.


When the user selects the




Update request, a JOptionPane
When the user selects the


windows is displayed to gather
Update request, a JOptionPane


information about a course that
window is not be displayed to


has just been completed
gather information about a


including the grade and number
course that has just been


of credits.
completed including the grade




and number of credits.




Code does not Compile.
Student class
40 points
0 points


Defines the student record.
Does not define the student




record.


Contains instance variables for




the student name, major and
Does not contains instance


two variables that are used to
variables for the student name,


compute the GPA.
major and two variables that




are used to compute the GPA.


Contains a variable




representing the total number
Does not contain a variable


of credits completed
representing the total number




of credits completed


Contains a variable representing




the total quality points, which
Does not contain a variable


are the numeric value of the
representing the total quality


grade received in a course times
points, which are the numeric


the number of credit hours.
value of the grade received in a




course times the number of


The class should not should
credit hours.


contain the student ID.






The class contains the student


Contains a constructor that is
ID.


used when new student records






4


are created. It should accept the
Does not contains a constructor


name and major as parameters
that is used when new student


and initialize the fields that are
records are created. It should


used to compute the GPA to
accept the name and major as


zero.
parameters and initialize the




fields that are used to compute


Contains a method
the GPA to zero.


courseCompleted that accepts




the course grade and credit
Does not contains a method


hours and update the variables
courseCompleted that accepts


used to compute the GPA.
the course grade and credit




hours and update the variables


courseComplete is called when
used to compute the GPA.


an Update request is made.






courseComplete is not called


Contains an overridden toString
when an Update request is


method that returns a labeled
made.


string containing the student




name, major and GPA.
Does not contains an




overridden toString method


Calculates and displays a GPA of
that returns a labeled string


4.0 for students who have not
containing the student name,


yet completed any course.
major and GPA.




Does not calculate or display a




GPA of 4.0 for students who




have not yet completed any




course.




Code does not Compile.
Test Cases
10 points
0 points


Test cases are supplied in the
No test cases were provided.


form of table with columns




indicating the input values,




expected output, actual output




and if the test case passed or




failed.




Enough scenarios selected to




completely test the program.




Test cases were included in the




supporting word or PDF




documentation.


Documentation and Style guide
10 points
0 points









5




Screen captures were provided




and labeled for compiling your

code, and running each of your

test cases.




Header comments include

filename, author, date and brief

purpose of the program.




In-line comments used to

describe major functionality of

the code.




Meaningful variable names and

prompts applied.




Class names are written in

UpperCamelCase.




Variable names are written in

lowerCamelCase.




Constant names are in written

in All Capitals.




Braces use K&R style.




Declare all instance variables

private.




Avoids the duplication of code.




Any exceptions thrown by

nonnumeric inputs are properly

handled.




No documentation included.







Java style guide was not used to prepare the Java code.




All instance variables not declared private.




Duplication of code was not avoided.




any exceptions thrown by nonnumeric inputs are not properly handled






















































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