Project 3 - A Job Posting Database

Due - Monday, November 13, 2006

• Add a new posting -- The user must be able to add a new job posting to the database.
• Remove a posting -- The user must be able to remove an existing posting from the database.
• View all postings sorted by employer -- The user must be able to view all of the postings in the database sorted by the name of the employer.
• View all postings for a particular job type -- The user must be able to view all postings for a particular type of job.
• Save database to file -- The user must be able to save all information stored in the database to a file.

Implementation Requirements and Hints

1. You must implement a JobPosting base class that can store and provide access to information about a generic job posting. This information should include (at minimum), the employer, the salary, and a job description. This class must be an abstract class. You must also implement a JobPostingDB class.
2. Your JobPostingDB class must have two constructors. One constructor will create an empty database and the other will create a database from a file. This second constructor should take as input the name of the file where the data is stored. Hint: you will need to think carefully about how you save the data to a file such that you can use it later to initialize your database.
3. You must also implement three derived classes, each to represent a different type of job posting: Clerical, Technical, and Managerial. Each subclass must store and provide access to position-specific information. In particular, the Managerial class must store information about the amount of travel expected, the Technical class should store information about technical skills required, and the Clerical class should store information about clerical skills required. You may choose to expand each of these classes to provide additional information as well. Each subclass must also implement its own print/toString method that will display all of the relevant information for a posting of that particular type.
4. As you add new postings, make sure to create the appropriate type of subclass (Clerical, Technical, or Managerial). The design of the user interface is up to you. However, think carefully about how the user will specify which job posting she wishes to remove if she chooses the remove option. Finally, think carefully about how you will determine the type of a particular job -- hint, think about casting.

Due 9:40AM, Monday November 13, 2006

1. Complete and submit your working code. Turn in a hard copy in class and place a copy of your .java files in /home/submit/cs112/username.
2. Make sure that each function is well documented. Your documentation should specify the type and function of the input parameters and output.
3. Run your program on a variety of inputs ensuring that all error conditions are handled correctly.