COP3330.01, Fall 2001 Assigned: 9/27/2001
S. Lang Assignment #3 Due: 10/11 in class
(Note: minor corrections in boldface font added 10/03)
The objectives of this assignment is to learn about how to write extended classes, the idea of abstract
class and method, character-based IO, and some string manipulation methods. You will be given an
abstract class Employee (in file Employee.java) as the base class. In this assignment, you are to create
a Boss class and an HourlyWorker class by extending the base class. Also, you are to write a
TestEmployee class with a main() method to test your java programs. The following specifies the
detailed requirements:
(1) The Boss class should have one private instance variable (field) weeklySalary of type double,
and contain one constructor:
Boss(String first, String last, double salary)
which creates a Boss object and initializes the fields firstName, lastName, and weeklySalary
based on the corresponding parameters; contain a method:
public String toString() that returns a string that says “Boss: “ followed by the person’s
first name and last name, all on the same line; and contain an implementation of the earnings()
method that returns the value of the instance variable weeklySalary.
(2) The HourlyWorker class should have two instance variables wage and hours, both of type
double, and contain a constructor:
HourlyWorker(String first, String last, double wagePerHour, double hoursWorked)
that creates a HourlyWorker object initializing the corresponding instance variables; contain
the following methods
public void setWage(double wagePerHour) and
public void setHours(double hoursWorked)
for resetting the fields wage and hours, respectively; contain a method:
public String toString() that returns a string that says “HourlyWorker: “ followed by the
person’s first name and last name, all on the same line; and contain an implementation of the
earnings() method that returns the value of wage*hours (i.e., the weekly pay).
(3) The TestEmployee class that contains a main() method to perform the following tasks:
(a) Prompt the user for the number of employee objects, then create an array of that size;
(b) Read input of employee records from the keyboard, where each input starts with a string
“Boss” or “HourlyWorker”, followed by the firstName and lastName of the Employee
(both of String type), followed by either a single number (for Boss object) or two
numbers (for HourlyWorker object), all data for the same employee on the same line.
The main() needs to “tokenize” the line and create the corresponding object, then store
each object at the next index of the array.
(c) The input continues until either the input ends or when the array size is reached. At that
point, use a loop to output all employee objects saved in the array using the toString()
method, with one object’s string per line.
The instructor will provide the Employee.java file for the Employee base class, and several input files
that contain sample employee records for testing your program. Prepare your homework the same
way as in the previous assignment: source files on a disk, a hardcopy of the source and a hardcopy of
each of the output results, put all information in a brown envelope with your name, social security
number, and which java environment you use, written on the envelope.
