This question is from Java Software Solutions 8th Edition Ch. 10 2pp. Modify the

ID: 3687050 • Letter: T

Question

This question is from Java Software Solutions 8th Edition Ch. 10 2pp.

Modify the Frim example from this chapter such that all emploees can be given different vacation options depending on their classification. Provide a method called vacation that returns the number of vacation days (14), then override the method in the various employee classes as appropriate. Modify the driver program to demonstrate this new funtionality.

public class Firm
{
//-----------------------------------------------------------------
// Creates a staff of employees for a firm and pays them.
//-----------------------------------------------------------------
public static void main(String[] args)
{
Staff personnel = new Staff();

personnel.payday();
}
}

Explanation / Answer

Hi I have modified requered functionality. Now it will all print number of vacation provided to each employee type using Polymorphism.

######## Staff.java #######################

//********************************************************************
//Staff.java Author: Lewis/Loftus
//
//Represents the personnel staff of a particular business.
//********************************************************************

public class Staff
{
private StaffMember[] staffList;

//-----------------------------------------------------------------
// Constructor: Sets up the list of staff members.
//-----------------------------------------------------------------
public Staff()
{
staffList = new StaffMember[6];

staffList[0] = new Executive("Sam", "123 Main Line",
"555-0469", "123-45-6789", 2423.07, 12);

staffList[1] = new Employee("Carla", "456 Off Line",
"555-0101", "987-65-4321", 1246.15, 14);
staffList[2] = new Employee("Woody", "789 Off Rocker",
"555-0000", "010-20-3040", 1169.23, 13);

staffList[3] = new Hourly("Diane", "678 Fifth Ave.",
"555-0690", "958-47-3625", 10.55, 10);

staffList[4] = new Volunteer("Norm", "987 Suds Blvd.",
"555-8374");
staffList[5] = new Volunteer("Cliff", "321 Duds Lane",
"555-7282");

((Executive)staffList[0]).awardBonus(500.00);

((Hourly)staffList[3]).addHours(40);
}

//-----------------------------------------------------------------
// Pays all staff members.
//-----------------------------------------------------------------
public void payday ()
{
double amount;

for (int count=0; count < staffList.length; count++)
{
System.out.println(staffList[count]);

amount = staffList[count].pay(); // polymorphic

     if (amount == 0.0)
        System.out.println("Thanks!");
     else
        System.out.println("Paid: " + amount);

System.out.println("-----------------------------------");
}
}

}

################# StaffMember.java ##########################

//********************************************************************
//StaffMember.java Author: Lewis/Loftus
//
//Represents a generic staff member.
//********************************************************************

abstract public class StaffMember
{
protected String name;
protected String address;
protected String phone;

//-----------------------------------------------------------------
// Constructor: Sets up this staff member using the specified
// information.
//-----------------------------------------------------------------
public StaffMember(String eName, String eAddress, String ePhone)
{
name = eName;
address = eAddress;
phone = ePhone;
}

//-----------------------------------------------------------------
// Returns a string including the basic employee information.
//-----------------------------------------------------------------
public String toString()
{
String result = "Name: " + name + " ";

result += "Address: " + address + " ";
result += "Phone: " + phone;

return result;
}

//-----------------------------------------------------------------
// Derived classes must define the pay method for each type of
// employee.
//-----------------------------------------------------------------
public abstract double pay();

public abstract int vacation();
}

################# Employee.java ###################

//********************************************************************
//Employee.java Author: Lewis/Loftus
//
//Represents a general paid employee.
//********************************************************************

public class Employee extends StaffMember
{
protected String socialSecurityNumber;
protected double payRate;
protected int vacation;

//-----------------------------------------------------------------
// Constructor: Sets up this employee with the specified
// information.
//-----------------------------------------------------------------
public Employee(String eName, String eAddress, String ePhone,
String socSecNumber, double rate, int vacation)
{
super(eName, eAddress, ePhone);

socialSecurityNumber = socSecNumber;
payRate = rate;
this.vacation = vacation;
}

//-----------------------------------------------------------------
// Returns information about an employee as a string.
//-----------------------------------------------------------------
public String toString()
{
String result = super.toString();

result += " Social Security Number: " + socialSecurityNumber;
result += " Number of Vacstion Days: " + vacation;

return result;
}

//-----------------------------------------------------------------
// Returns the pay rate for this employee.
//-----------------------------------------------------------------
public double pay()
{
return payRate;
}

@Override
public int vacation() {

return vacation;
}
}

#################### Executive.java######################

//********************************************************************
//Executive.java Author: Lewis/Loftus
//
//Represents an executive staff member, who can earn a bonus.
//********************************************************************

public class Executive extends Employee
{
   private double bonus;

//-----------------------------------------------------------------
// Constructor: Sets up this executive with the specified
// information.
//-----------------------------------------------------------------
public Executive(String eName, String eAddress, String ePhone,
                String socSecNumber, double rate ,int vacation)
{
super(eName, eAddress, ePhone, socSecNumber, rate, vacation);

bonus = 0; // bonus has yet to be awarded
}

//-----------------------------------------------------------------
// Awards the specified bonus to this executive.
//-----------------------------------------------------------------
public void awardBonus(double execBonus)
{
bonus = execBonus;
}

//-----------------------------------------------------------------
// Computes and returns the pay for an executive, which is the
// regular employee payment plus a one-time bonus.
//-----------------------------------------------------------------
public double pay()
{
double payment = super.pay() + bonus;

bonus = 0;

return payment;
}
}

################# Hourly.java ####################

//********************************************************************
//Hourly.java Author: Lewis/Loftus
//
//Represents an employee that gets paid by the hour.
//********************************************************************

public class Hourly extends Employee
{
private int hoursWorked;
protected int vacation;
//-----------------------------------------------------------------
// Constructor: Sets up this hourly employee using the specified
// information.
//-----------------------------------------------------------------
public Hourly(String eName, String eAddress, String ePhone,
String socSecNumber, double rate, int vacation)
{
super(eName, eAddress, ePhone, socSecNumber, rate, vacation);

hoursWorked = 0;
}

//-----------------------------------------------------------------
// Adds the specified number of hours to this employee's
// accumulated hours.
//-----------------------------------------------------------------
public void addHours(int moreHours)
{
hoursWorked += moreHours;
}

//-----------------------------------------------------------------
// Computes and returns the pay for this hourly employee.
//-----------------------------------------------------------------
public double pay()
{
double payment = payRate * hoursWorked;

hoursWorked = 0;

return payment;
}

//-----------------------------------------------------------------
// Returns information about this hourly employee as a string.
//-----------------------------------------------------------------
public String toString()
{
String result = super.toString();

result += " Current hours: " + hoursWorked;

return result;
}
}

################## Volunteer.java ########################

//********************************************************************
//Volunteer.java Author: Lewis/Loftus
//
//Represents a staff member that works as a volunteer.
//********************************************************************

public class Volunteer extends StaffMember
{
//-----------------------------------------------------------------
// Constructor: Sets up this volunteer using the specified
// information.
//-----------------------------------------------------------------
public Volunteer(String eName, String eAddress, String ePhone)
{
super(eName, eAddress, ePhone);
}

//-----------------------------------------------------------------
// Returns a zero pay value for this volunteer.
//-----------------------------------------------------------------
public double pay()
{
return 0.0;
}

@Override
public int vacation() {

return 1;
}
public String toString()
{
String result = super.toString();

result += " Number of Vacstion Days: " + vacation();

return result;
}
}

################## Firm.java ##################

personnel.payday();

}
}

Output:

Name: Sam
Address: 123 Main Line
Phone: 555-0469
Social Security Number: 123-45-6789
Number of Vacstion Days: 12
Paid: 2923.07
-----------------------------------
Name: Carla
Address: 456 Off Line
Phone: 555-0101
Social Security Number: 987-65-4321
Number of Vacstion Days: 14
Paid: 1246.15
-----------------------------------
Name: Woody
Address: 789 Off Rocker
Phone: 555-0000
Social Security Number: 010-20-3040
Number of Vacstion Days: 13
Paid: 1169.23
-----------------------------------
Name: Diane
Address: 678 Fifth Ave.
Phone: 555-0690
Social Security Number: 958-47-3625
Number of Vacstion Days: 10
Current hours: 40
Paid: 422.0
-----------------------------------
Name: Norm
Address: 987 Suds Blvd.
Phone: 555-8374
Number of Vacstion Days: 1
Thanks!
-----------------------------------
Name: Cliff
Address: 321 Duds Lane
Phone: 555-7282
Number of Vacstion Days: 1
Thanks!
-----------------------------------

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