(Payroll System Modification) Modify the payroll system of Figs. 10.4–10.9 to include private instance variable birth Date in class Employee. Use class Date of Fig. 8.7 to represent an employee’s birthday. Add get methods to class Date. Assume that payroll is processed once per month.Create an array of Employee variables to store references to the various employee objects. In a loop,calculate the payroll for each Employee (polymorphically), and add a $100.00 bonus to the person’s payroll amount if the current month is the one in which the Employee’s birthday occurs.Payroll System Modification in Java
/*
* Filename: PayrollSystemTest.java
*
* Description: Exercise 10.10 - Payroll System Modification
*
* @Author: Bilal Tahir Khan Meo
* Website: https://codeblah.com
*
* =====================================================================================
*/
import java.util.Calendar;public class PayrollSystemTest{
public static void main(String[] args){
int currentMonth = 1 + Calendar.getInstance().get(Calendar.MONTH); // create four element Employee array
Employee[] employees = new Employee[5]; // initialise array with Employees
employees[0] = new SalariedEmployee(
"John", "Smith", "111-11-1111", 800.0f, 11, 3, 1883);
employees[1] = new HourlyEmployee(
"Karen", "Price", "222-22-2222", 16.75f, 40.0f, 12, 12, 1975);
employees[2] = new CommissionEmployee(
"Sue", "Jones", "333-33-3333", 10000.0f, .06f, 12, 13, 1965);
employees[3] = new BasePlusCommissionEmployee(
"Bob", "Lewis", "444-44-4444", 5000.0f, .04f, 300.0f, 12, 12, 1956);
employees[4] = new PieceWorker(
"Deez", "Nutz", "555-55-5555", 20.25f, 52.0f, 10, 11, 1983); System.out.println("Employees processed polymorphically:\n"); for(Employee currentEmployee : employees){
System.out.println(currentEmployee); // determine whether element is a BasePlusCommissionEmployee
if(currentEmployee instanceof BasePlusCommissionEmployee){
// downcase Employee reference to
// BasePlusCommissionEmployee reference
BasePlusCommissionEmployee employee =
(BasePlusCommissionEmployee) currentEmployee; employee.setBaseSalary(1.10f * employee.getBaseSalary()); System.out.printf("new base salary with 10%% increase is: $%,.2f\n",
employee.getBaseSalary());
} // add $100.0 if birth month is current
System.out.printf("earned $%,.2f\n\n",
(currentEmployee.getBirthday().getMonth() == currentMonth) ?
currentEmployee.earnings() + 100.0f : currentEmployee.earnings());
} // get type name of each object in employee array
for(int j=0; j<employees.length; j++){
System.out.printf("Employee %d is a %s\n",
j, employees[j].getClass().getName());
}
}
}
PieceWorker.java
/*
* Filename: PieceWorker.java
*
* Description: Exercise 10.10 - Payroll System Modification
*
* @Author: Bilal Tahir Khan Meo
* Website: https://codeblah.com
*
* =====================================================================================
*/
public class PieceWorker extends Employee{
private double wage;
private double pieces; // constructor
public PieceWorker(String first, String last, String ssn,
double wage, double pieces, int month, int day, int year){
super(first, last, ssn, month, day, year); setWage(wage);
setPieces(pieces);
}
// SETTERS
public void setWage(double w){
if(w >= 0.0f)
this.wage = w;
else
throw new IllegalArgumentException(
"Wage must be >= 0.0f");
}
public void setPieces(double p){
if(p >= 0.0f)
this.pieces = p;
else
throw new IllegalArgumentException(
"Pieces must be >= 0.0f");
}
// GETTERS
public double getWage(){
return this.wage;
}
public double getPieces(){
return this.pieces;
}
// calculate earnings; override abstract method in Employee
@Override
public double earnings(){
return getPieces() * getWage();
}
// String representation of object
@Override
public String toString(){
return String.format("piece worker: %s\n%s: $%,.2f; %s: %,.2f",
super.toString(), "wage", getWage(),
"pieces produced", getPieces());
}
}
Method 1 : Payroll System Modification in Java
BasePlusCommissionEmployee.java
/*
* Filename: BasePlusCommissionEmployee.java
*
* Description: Exercise 10.8 - Payroll System Modification
*
* @Author: Bilal Tahir Khan Meo
* Website: https://codeblah.com
*
* =====================================================================================
*/
public class BasePlusCommissionEmployee extends CommissionEmployee{
private double baseSalary; // constructor
public BasePlusCommissionEmployee(String first, String last, String ssn,
double sales, double rate, double salary, int month, int day, int year){
// call CommissionEmployee constructor
super(first, last, ssn, sales, rate, month, day, year);
setBaseSalary(salary);
}
// SETTERS
public void setBaseSalary(double salary){
if(salary >= 0.0f)
baseSalary = salary;
else
throw new IllegalArgumentException(
"Base salary must be >= 0.0f");
}
// GETTERS
public double getBaseSalary(){
return this.baseSalary;
}
// calculate earnings; override method earnings in CommissionEmployee
@Override
public double earnings(){
return getBaseSalary() + super.earnings();
}
// return String representation of object
@Override
public String toString(){
return String.format("%s %s; %s: $%,.2f",
"base-salaried", super.toString(),
"base salary", getBaseSalary());
}
}
CommissionEmployee.java
/*
* Filename: CommissionEmployee.java
*
* Description: Exercise 10.8 - Payroll System Modification
*
* @Author: Bilal Tahir Khan Meo
* Website: https://codeblah.com
*
* =====================================================================================
*/
public class CommissionEmployee extends Employee{
private double grossSales;
private double commissionRate; // constructor
public CommissionEmployee(String first, String last, String ssn,
double sales, double rate, int month, int day, int year){
super(first, last, ssn, month, day, year);
setGrossSales(sales);
setCommissionRate(rate);
}
// SETTERS
public void setCommissionRate(double rate){
if(rate > 0.0f && rate < 1.0f)
this.commissionRate = rate;
else
throw new IllegalArgumentException(
"Commission rate must be > 0.0f and < 1.0f");
}
public void setGrossSales(double sales){
if(sales >= 0.0f)
this.grossSales = sales;
else
throw new IllegalArgumentException
("Gross sales muse be >= 0.0f");
}
// GETTERS
public double getCommissionRate(){
return this.commissionRate;
}
public double getGrossSales(){
return this.grossSales;
}
// calculate earnings; override abstract method earnings in Employee
@Override
public double earnings(){
return getCommissionRate() * getGrossSales();
}
// String representation of object
@Override
public String toString(){
return String.format("%s: %s\n%s: $%,.2f; %s: %.2f",
"commission employee", super.toString(),
"gross sales", getGrossSales(),
"commission rate", getCommissionRate());
}
}
Date.java
/*
* Filename: Date.java
*
* Description: Exercise 10.8 - Payroll System Modification
*
* @Author: Bilal Tahir Khan Meo
* Website: https://codeblah.com
*
* =====================================================================================
*/
public class Date{
private static final int MONTHS_IN_YEAR = 12;
private static final int FEB_LEAP_YEAR = 29; // non static so as not to screw up non leap year february's
private final int[] daysPerMonth =
{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; private static final String[] strMonths =
{"", "January", "February", "March", "April", "May", "June", "July", "August",
"September", "October", "November", "December"}; private static final String[] strDays =
{"", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"}; private int[] date = new int[3]; // constructors
// overloaded constructors need to set year first
// to check for/against leap year
// default
public Date(){
date[0] = 1;
date[1] = 1;
date[2] = 1900;
}
// mm dd yyyy - 3 ints
public Date(int month, int day, int year){
setYear(year);
setMonth(month);
setDay(day);
}
// month dd yyyy - string month 2 ints
public Date(String month, int day, int year){
setYear(year);
setStringMonth(month);
setDay(day);
}
// DDDD YYYY - longform day number and year
public Date(int dayOfYear, int year){
setYear(year);
setLongFormDay(dayOfYear);
}
// SETTERS
public void setMonth(int month){
date[0] = checkMonth(month);
}
public void setStringMonth(String month){
date[0] = checkStringMonth(month);
}
public void setDay(int day){
date[1] = checkDay(day);
}
// get month and day from day of year
public void setLongFormDay(int dayOfYear){
if(dayOfYear <= 0 || dayOfYear > 365)
throw new IllegalArgumentException("day of year must be 1-365"); int month = 1; // if leap year fix daysPerMonth day count
if(isLeapYear() && daysPerMonth[2] != FEB_LEAP_YEAR)
daysPerMonth[2] = FEB_LEAP_YEAR; // determine the month by sequentially subtracting daysPerMonth
// and incrementing months counter. Remainder is day of month
while(dayOfYear > daysPerMonth[month]){
dayOfYear -= daysPerMonth[month];
month++;
} setMonth(month);
setDay(dayOfYear);
}
public void setYear(int year){
date[2] = checkYear(year);
}
// GETTERS
public int getMonth(){
return date[0];
}
public int getDay(){
return date[1];
}
public int getYear(){
return date[2];
}
// return int representation of day number in the year
// add total daysPerMonth upto one month before current
// add day onto total
private int getDayOfYear(){
int tmp = 0; for(int i=1; i<date[0]; i++){
tmp += daysPerMonth[i];
}
return tmp + date[1];
}
// ensures string month is valid
private int checkStringMonth(String month){
if(month.length() > 1)
month = month.substring(0, 1).toUpperCase() + month.substring(1); // check for matches
for(int i=1; i<strMonths.length; i++){
if(strMonths[i].equals(month))
return i;
} throw new IllegalArgumentException("invalid month string");
}
// check month is within correct range
private int checkMonth(int testMonth){
if(testMonth > 0 && testMonth <= MONTHS_IN_YEAR)
return testMonth;
else
throw new IllegalArgumentException("month must be 1-12");
}
// check day is within range for month
private int checkDay(int testDay){
if(isLeapYear() && daysPerMonth[2] != FEB_LEAP_YEAR)
daysPerMonth[2] = FEB_LEAP_YEAR; if(testDay > 0 && testDay <= daysPerMonth[getMonth()])
return testDay; throw new IllegalArgumentException("day out of range for specified month and year");
}
// check for leap year
private boolean isLeapYear(){
return (getYear() % 400 == 0 || (getYear() % 4 == 0 && getYear() % 100 != 0));
}
// check year is within 4 digit range and not negative
private int checkYear(int testYear){
if(testYear >= 0 && testYear <= 9999)
return testYear;
else
throw new IllegalArgumentException("year must be 0-9999");
}
// string representations
public String toString(){
return String.format("%02d/%02d/%04d", date[0], date[1], date[2]);
}
public String toLongDateString(){
return String.format("%s %02d %04d", strMonths[date[0]], date[1], date[2]);
}
public String toDayOfYearString(){
return String.format("%03d %04d", getDayOfYear(), date[2]);
}
}
Employee.java
/*
* Filename: Employee.java
*
* Description: Exercise 10.8 - Payroll System Modification
*
* @Author: Bilal Tahir Khan Meo
* Website: https://codeblah.com
*
* =====================================================================================
*/
public abstract class Employee{
private String firstName;
private String lastName;
private String socialSecurityNumber;
private Date birthDay; // constructor
public Employee(String first, String last, String ssn,
int month, int day, int year){ setFirstName(first);
setLastName(last);
setSocialSecurityNumber(ssn); birthDay = new Date(month, day, year);
}
// SETTERS
public void setFirstName(String first){
this.firstName = first;
}
public void setLastName(String last){
this.lastName = last;
}
public void setSocialSecurityNumber(String ssn){
this.socialSecurityNumber = ssn;
}
// GETTERS
public String getFirstName(){
return this.firstName;
}
public String getLastName(){
return this.lastName;
}
public String getSocialSecurityNumber(){
return this.socialSecurityNumber;
}
public Date getBirthday(){
return this.birthDay;
}
// return String representation of Employee object
@Override
public String toString(){
return String.format("%s %s\nsocial security number: %s",
getFirstName(), getLastName(), getSocialSecurityNumber());
}
// ABSTRACT METHODS
// not implemented here
public abstract double earnings();
}
HourlyEmployee.java
/*
* Filename: HourlyEmployee.java
*
* Description: Exercise 10.8 - Payroll System Modification
*
* @Author: Bilal Tahir Khan Meo
* Website: https://codeblah.com
*
* =====================================================================================
*/
public class HourlyEmployee extends Employee{
private double wage;
private double hours; // constructor
public HourlyEmployee(String first, String last, String ssn,
double hourlyWage, double hoursWorked, int month, int day, int year){
// explicit Employee constructor call
super(first, last, ssn, month, day, year);
setWage(hourlyWage);
setHours(hoursWorked);
}
// SETTERS
public void setWage(double hourlyWage){
if(hourlyWage >= 0.0f)
this.wage = hourlyWage;
else
throw new IllegalArgumentException(
"Hourly wage must be >= 0.0f");
}
public void setHours(double hoursWorked){
if((hoursWorked >= 0.0f) && (hoursWorked <= 168.0f))
this.hours = hoursWorked;
else
throw new IllegalArgumentException(
"Hours worked must be >= 0.0f and <= 16.0f");
}
// GETTERS
public double getWage(){
return this.wage;
}
public double getHours(){
return this.hours;
}
// calculate earnings; override abstract method earnings in Employee
@Override
public double earnings(){
if(getHours() <= 40)
return getWage() * getHours();
else
return 40 * getWage() + (getHours() - 40) * getWage() * 1.5f;
}
// String representation of object
@Override
public String toString(){
return String.format("hourly employee: %s\n%s: $%,.2f; %s: %,.2f",
super.toString(), "hourly wage", getWage(),
"hours worked", getHours());
}
}
PayrollSystemTest.java
/*
* Filename: PayrollSystemTest.java
*
* Description: Exercise 10.8 - Payroll System Modification
*
* @Author: Bilal Tahir Khan Meo
* Website: https://codeblah.com
*
* =====================================================================================
*/
import java.util.Calendar;public class PayrollSystemTest{
public static void main(String[] args){
int currentMonth = 1 + Calendar.getInstance().get(Calendar.MONTH); // create four element Employee array
Employee[] employees = new Employee[4]; // initialise array with Employees
employees[0] = new SalariedEmployee(
"John", "Smith", "111-11-1111", 800.0f, 11, 3, 1883);
employees[1] = new HourlyEmployee(
"Karen", "Price", "222-22-2222", 16.75f, 40.0f, 12, 12, 1975);
employees[2] = new CommissionEmployee(
"Sue", "Jones", "333-33-3333", 10000.0f, .06f, 12, 13, 1965);
employees[3] = new BasePlusCommissionEmployee(
"Bob", "Lewis", "444-44-4444", 5000.0f, .04f, 300.0f, 12, 12, 1956); System.out.println("Employees processed polymorphically:\n"); for(Employee currentEmployee : employees){
System.out.println(currentEmployee); // determine whether element is a BasePlusCommissionEmployee
if(currentEmployee instanceof BasePlusCommissionEmployee){
// downcase Employee reference to
// BasePlusCommissionEmployee reference
BasePlusCommissionEmployee employee =
(BasePlusCommissionEmployee) currentEmployee; employee.setBaseSalary(1.10f * employee.getBaseSalary()); System.out.printf("new base salary with 10%% increase is: $%,.2f\n",
employee.getBaseSalary());
} // add $100.0 if birth month is current
System.out.printf("earned $%,.2f\n\n",
(currentEmployee.getBirthday().getMonth() == currentMonth) ?
currentEmployee.earnings() + 100.0f : currentEmployee.earnings());
} // get type name of each object in employee array
for(int j=0; j<employees.length; j++){
System.out.printf("Employee %d is a %s\n",
j, employees[j].getClass().getName());
}
}
}
SalariedEmployee.java
/*
* Filename: SalariedEmployee.java
*
* Description: Exercise 10.8 - Payroll System Modification
*
* @Author: Bilal Tahir Khan Meo
* Website: https://codeblah.com
*
* =====================================================================================
*/
public class SalariedEmployee extends Employee{
private double weeklySalary; // constructor
public SalariedEmployee(String first, String last, String ssn, double salary,
int month, int day, int year){
// pass to Employee constructor
super(first, last, ssn, month, day, year); setWeeklySalary(salary);
}
// SETTERS
public void setWeeklySalary(double salary){
if(salary >= 0.0f)
this.weeklySalary = salary;
else
throw new IllegalArgumentException(
"Weekly salary must be >= 0.0f");
}
// GETTERS
public double getWeeklySalary(){
return this.weeklySalary;
}
// calculate earnings; override abstract method earnings in Employee
@Override
public double earnings(){
return getWeeklySalary();
}
// return String representation of SalriedEmployee object
@Override
public String toString(){
return String.format("salaried employee: %s\n%s: $%,.2f",
super.toString(), "weekly salary", getWeeklySalary());
}
}
Originally published at codeblah.com on February 15, 2019.
