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NOTE: You will only submit the University.java and EmptyFileException.java files (inside P3.zip/tar)
NOTE on null objects:. From Project 1: Since the array of students in the Course class might have no objects (null), remember to do a null check when traversing the array.
UPDATE March 23rd: There was a slight error in the "university.txt" file provided for part A. Please make sure you work with the latest version.
NOTE: You should NOT modify any classes other than University.java.
For this project you will be storing and retrieving the Sakai system implemented in project 1.
You will first need to download the solution to project 1.
There are two parts to the project:
PART A:. This part involves writing out all the information to a file. Modify the University.java file by adding this method:
public boolean writeToFile(String filename):
-The method should write out all the information to the filename passed in. If successfully written it returns true, otherwise false.
-The file format is as follows: (parentheses indicate the information has to be written out)
University Name: (university''s name)
Current Term: (currentTerm)
Current Year: (currentYear)
Number of Students: (number of students)
Number of Instructors: (number of instructors)
Number of Courses: (number of courses)
The information above is to be written out first. Immediately following the above the information for each student has to be written out as specified below:
Name: (student''s name)
UFID: (student''s ufid)
D.O.B: (student''s dob)
GPA: (student''s gpa)
Number of Courses: (number of courses the student is enrolled in)
Immediately following the above the information for each instructor has to be written out as specified below:
Name: (instructor''s name)
UFID: (instructor''s ufid)
D.O.B: (instructor''s dob)
Immediately following the above the information for each course has to be written out as specified below:
Number of credits: (numCredits)
Instructor UFID: (UFID of the instructor)
Number of TAs: (number of TAs)
TA UFIDs: (ufid of first ta),(ufid of second ta),...,(ufid of last ta)
Current Enrollment: (currentEnrollment)
Student UFIDs: (ufid of first student),(ufid of second student),...,(ufid of last student)
That signifies the end of the file.
Use TestDriver1 to test your solution to Part A.
This driver will produce a file named university.txt. Use the output file provided to compare whether your program writes it out properly.
PART B: This part will involve reading from a file and reconstructing all the objects in the Sakai system.
Create the class EmptyFileException, which will be a subclass of Exception.. This exception is thrown when a file is empty. It will have the following properties and methods:
- String filename; // This represents the name of the file which is empty
Empty constructor which does nothing
- EmptyFileException(String filename)
Takes in the name of the file which is empty and set''s the properties appropriately
public String toString();
It will return a string in this format:
The file (filename) is empty.
Modify the University.java file by adding this method:
public static University readFromFile(String filename):
-This method will read in all the university info from a file and construct the university object.
-If the object is properly created it is returned, otherwise a null object is returned.
-If the file to read from is empty, the method will try-and-catch the EmptyFileException created above.
When the exception is caught it''s information is printed out (via the toString method).
(HINT: Try to use helper methods for reading in different kinds of objects - Student, Instructor and Course.)
Use TestDriver2 to test your solution. It tries to read in the university.txt file. Compare with our output.
Posted Date: 3/26/2012 3:56:52 AM | Location : United States
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