Objectives:

• Use an abstract class.
• Practice with the is-a relationship.
• Use a helper class to handling I/O.
• Use type-casting in a more complex program.
• Use the instanceof operator to distinguish among subclasses.
• Use protected class members to share information among classes in the hierarchy.

Prior to the recitation:

• Read Section 7.4 of the textbook carefully. We will be using the classes in Listings 7.15, 7.18, and 7.19. Be sure to bring your textbook to class.
• Make index cards for the StaffMember, StaffMemberIO, Employee, Executive and Hourly classes.
• Print out this recitation and read it over.
• To save time during the lab, do the setup before your lab hour

Hand-in Requirements:

Overview:

Setup:

• Project/Package Name:  departmentstorepkg
• New Main Class:  DepartmentStoreTest
• New Class: StaffMember
• New Class: StaffMemberIO
• New Class: Employee
• New Class: Executive
• New Class: Hourly
• New Class: DepartmentStore
• Save the following files in your src/departmentstorepkg directory.

StaffMember.java, StaffMemberIO.java, Employee.java, Executive.java, Hourly.java, and DepartmentStore.java.
• Save employees.txt in the departmentstorepkg directory.

Part I: Using the StaffMemberIO class.

• Do the prelab setup as described above to create the DepartmentStoreTest project as a standalone console application. Build and run.
• Instantiate a StaffMemberIO object called empIn in DepartmentStoreTest. Use employees.txt as the file name parameter. When you instantiate a StaffMemberIO object it opens the specified file for input.
• The StaffMemberIO class has a method called getNext that returns a new object of one of the types derived from StaffMember (e.g., Employee, Hourly, or Executive) based on the next entry read from the file. (Why can't it return a StaffMember object?) If all of the entries have already been read, or there is an error of some kind, getNext returns null. Add a loop to DepartmentStoreTest to read in the objects from employees.txt and output them.
• Add code in your loop to determine what kind of object is returned (e.g., Employee, Hourly, or Executive) by using instanceof and output the type of object as well as the object. Notice that since Executive and Hourly objects are also Employee objects, you must test for Executive and Hourly first.
• Get a hard copy of your output before going on.

Part II: The DepartmentStore class

• Comment out the code from Part I in DepartmentStoreTest
• Write client code to instantiate a DepartmentStore object called store. Use employees.txt as the file name.
• Write the initialize method that instantiates a StaffMemberIO object for myFileName and reads the information into myEmployees. Set myNumberEmployees appropriately. Call resize if necessary.
• Write the following print methods of DepartmentStore and add client code in DepartmentStoreTest to test them:
• print - prints the information about every employee. Include their classification in the printout.
• printEmployees - prints all the information about each employee who is an employee, but not an executive or hourly. (You will need to use the instanceof operator here.)
• printExecutives - prints all the information about each executive employee. (You will need to use the instanceof operator here.)
• printHourly prints all the information about each hourly employee. (You will need to use the instanceof operator here.)
• Write a findEmployee(String SSN) method in DepartmentStore that returns a Employee object corresponding to the specified employee or null if the employee is not found. Add client code to DepartmentStoreTest to test this method. (Notice that StaffMember doesn't have a field corresponding to the social security number. This is an example of the use of a protected field among subclasses.)
• Write an updateHours(String SSN, int hours) method in DepartmentStore that adds the specified hours to the specified hourly employee. If the employee is not an Hourly print out a warning message. Use findEmployee.
• Write a method awardBonus(double amount) that sets the bonus for each executive to amount. Add client code to DepartmentStoreTest to test this method.