CP2003 - Assignment 2, Due Date - 5PM, Friday, October 9

This assignment is an introduction to the agony and ecstasy of Java programming. It is worth ten percent of your CP2003 grade.

You should create a new directory named as assign2_2003 or any name you like. This directory will contains all the java programs for assignment 2 and related subdirectories for the package required in the assignment two.

When you are done and certain that everything is working correctly, turnin in the assignment as follows.

• Go to directory which contains your subdirectory assign2_2003;
• use command: tar cvf assign2.tar assign2_2003

  You will have a file named as assign2.tar

• use command: uuencode assign2.tar assign2.tar | elm jinli@cs.jcu.edu.au

  Your tared file assign2.tar is encoded and is sent to my Email address.

Marking

The assignment will be marked for good programming style (indentation and appropriate comments), as well as clean compilation (it should work!). Important: Please comment all code, with appropriate comments. The first line is your file name and second line is your name, etc. Upto thirty percent of your mark will be for style.

The Assignment Question

Let us use abstract methods and polymorphism to perform payroll calculations based on the type of an employee. We use an abstract superclass Employee. The subclasses of Employee are:

• Manger, who gets paid a fixed weekly salary regardless of the working hours;
• HourlyWorker, who gets paid by the hour and received overtime pay (double wage).
• CommissionWorker, who gets a flat base salary plus a percentage of sales.

The super class describes the command data of employees in a company. An income method is declared as an abstract method since the calculations of the salaries depend on the class of the employee.

class Date ----in package named as employee

Date is an auxiliary class and will be used by Employee . Edit Date.java to implement this class. The Date class contains pertinent information about a Date. For this program, the pertinent information is the day, month and year. The program should check the validation of the date, eg. month shouldn't greater than 13, etc.

You are to write the following methods.

• a constructor method with three parameters (day, month, year).
  • confirm proper value for month;
  • call method function checkDay to validate the day.
    • private int checkDay (int) - Returns the day or -1.
• printOut the date with return the value of the date as a string. ( DD/MM/YYYY)

abstract class Employee ----in package named as employee

Edit Employee.java to use class date.

class Employee contains attributes:

            firstName;     //String class
            secondName;
     static  int count;  // To count the no. of Employees
     Date   birthDate;

I'd like you to write the following methods.

      Employee( firtName, lastName, birthDay )---constructor !

The constractor should also count the number of employees created in the application program.

• getFirstName() { return firstName; }
• getLastName() { return lastName; }
• printBirthDate() {... }
• printInformation(){... }
• static int getCount() { return count; }
• abstract double income(); //must be implemented in subclass

class CommissionWorker----in package employee

class HourlyWorker----in package employee

class Manger----in package employee

These three classes are subclasses of Employee.

I'd like you to write the following methods.

• Constructor: you should include the superclass's constructor for the initialization, and set some values for calculation of salary as follows respectively:
  • Manager: weeklysalary.
  • CommissionWorker: basicSalary, commissionPercent and quantity.
  • HourlyWorker: wagePerHour, HoursWorked, overHours.
• method income: to implement the abstract method of Employee.
  • Manager: weeklySalary.
  • CommissionWorker's salary:

     
    weeklySalary = basicSalary + commissionPercent * quantity
    

  • HourlyWorker's salary:

     
    weeklySalary = wagePerHour* HoursWorked + overHours* 2*wagePerHour
    

• other methods if you need for the calculation and printing message out.

class EmployeeTest

I've done part of the assignment for you.

 

....  import packages here;

class EmployeeTest {
 
  public static void main(String args[]) throws IOException 
  {
      BufferedReader input = new BufferedReader(new
                      InputStreamReader(System.in));
               /*Create an object input to read from keyboard */
       ....Declarations of variables here;
       ....Create Employee objects here;
       ....a prompt message to user which type of employee's name are required
      to input from keyboard        
    try{
       for (int num=1; num<=3; num ++){   // you may not use this loop
           ... a prompt message for input a name 
           ...     =input.readLine();   //read a line of characters

  /* Right part of assignment is a String variable of fristName or secondName */
          
             System .out.flush();   
       //forces any buffered output bytes to be written out. 
         
           ... a prompt message for input a name 
          ...       = input.readLine();
          ....  birthday input
          ...   long aDate =Long.parseLong(A string read from Keyboard  );
          .....
          ...    assign names to Employees;
          ...    and print out the Employees information by calling method
                  from class Employee 
      catch {IOException e) {...}
 }         

Here is the site for all the methods defined by Java. You should check the definitions of the methods you will use.

Good luck!