CS 111: Lab 4 main content

Student Learning Objectives

Demonstrate the ability to

Use the jGRASP programming environment to create a new Java project at u:\Lab4\ with three Java code files: Employee.java, ProductionWorker.java and Driver.java.
Use inheritance in class ProductionWorker.
Use String.matches method in Employee class

Lab 4 Assignment

Do Chapter 9, Programming Challenge 1: Employee and ProductionWorker Classes

Create a new Java project at u:\Lab4\.
Add three Java files to the project:
1. Driver.java should contain the main method
2. Employee.java should contain the code for the superclass (note: code is provided below to copy and paste into your file. You do not need to modify this code)
3. ProductionWorker.java should inherit from the Employee class. It should have fields to hold the following information:
  - Shift (an integer) - The work day is divided into two shifts: day and night. The shift field will be an integer value representing the shift that the employee works. The day shift is 1 and the night shift is 2.
  - Hourly pay rate (a double)
Write the code for the Driver class to
- Read in the values for three production workers from an input file and store them in an array
- For debugging purposes, output the three production workers (using ProductionWorker.toString() method) once they were all read into the array

Sample Session

Follow the sample sessions shown below:

Enter the name of the input file: employees.txt

Name:               Ed Gellenbeck
Employee Number:    123-D
Hire Date:          10/2/2001
Shift:              Day
Hourly Pay Rate:    $12.50

Name:               Fred Stanley
Employee Number:    345-A
Hire Date:          1/20/2000
Shift:              Night
Hourly Pay Rate:    $25.65

Name:               Jim Schwing
Employee Number:    899-B
Hire Date:          05/12/2002
Shift:              Day
Hourly Pay Rate:    $100.33

You may use the following employees.txt input file:

Ed Gellenbeck
123-D
10/2/2001
1
12.50
Fred Stanley
345-A
1/20/2000
2
25.65
Jim Schwing
899-B
05/12/2002
1
100.33

Employee.java

Use the code below for your Employee class. You do not need to modify this code

   public abstract class Employee
   {
   //Private instance variables
      private String name;
      private String number;
      private String hireDate;
      
   
   // No Args Constructor
      public Employee()
      {
         name = "NO NAME";
         number = "NO NUMBER";
         hireDate = "NO HIRE DATE";
      }
   
   
   // Constructor
      public Employee(String employeeName, String employeeNumber, String hireDate)
      {
         setEmployeeName(employeeName);
         setEmployeeNumber(employeeNumber);
         setHireDate(hireDate);
      }
   
   
   // Sets name to employeeName if legal, otherwise sets to "NO NAME"
      public void setEmployeeName(String employeeName)
      {
         if (employeeName.matches("[a-zA-Z ]+"))
            name = employeeName;
         else
            name = "NO NAME";
      }
   
   
   // Sets number to employeeNumber if legal, otherwise sets to "NO NUMBER"
      public void setEmployeeNumber(String employeeNumber)
      {
         if (employeeNumber.matches("\\d{3}-[A-M]"))
            number = employeeNumber;
         else
            number = "INVALID NUMBER";
      }
   
   
   // Sets hireDate to dateHired if legal, otherwise sets to "NO HIRE DATE"
      public void setHireDate(String dateHired)
      {
         if (dateHired.matches("\\d\\d?/\\d\\d?/\\d\\d\\d\\d"))
            hireDate = dateHired;
         else
            hireDate = "NO HIRE DATE";
      }
   
   
   // Returns the employee's name
      public String getEmployeeName()
      {
         return name;
      }
   
   
   // Returns the employee's number
      public String getEmployeeNumber()
      {
         return number;
      }
   
   
   // Returns the employee's hire date
      public String getHireDate()
      {
         return hireDate;
      }
   
   
   // Returns the name, number and hire date
      public String toString()
      {
         return "Name:\t\t" + name + 
                "\nEmployee Number:\t" + number +   
                "\nHire Date:\t\t" + hireDate;
      }
   }

To Receive Credit

If you finish during Tuesday's lab, ask your TA to come over to check your program and give you credit.
Note: The TA will check your program on your computer. You do not need to print out the source code.
If you are unable during Tuesday's lab, turn in the printout of ProductionWorker.java and Driver.java by the start of class on Wednesday.

Programming Challenge

If you finish early, get yourself checked off first! As a programming challenge (not required but recommended):

Modify your program so that the

The int shift variable in ProductionWorker uses an enumerated type instead. If a value other than 1 or 2 is read from input, assign shift to the default value Shift.None
The hourly pay rate input value is error checked (use String.matches) for a legal pay rate amount. Assign payRate the default value 0.0 if the input value is in the incorrect format

public enum ShiftType {None, Day, Night}