Name: CSIS 312 Assignment 3 Payroll System Solved
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Modify the payroll system of Figs. 10.4–10.9 to include an additional Employee subclass PieceWorker that represents an employee whose pay is based on the number of pieces of merchandise produced.
Class PieceWorker should contain private instance variables wage (to store the employee’s wage per piece) and pieces (to store the number of pieces produced).
Provide a concrete implementation of method earnings in class PieceWorker that calculates the employee’s earnings by multiplying the number of pieces produced by the wage per piece.
Create an array of Employee variables to store references to objects of each concrete class in the new Employee hierarchy (SalariedEmployee, CommissionEmployee, HourlyEmployee, BasePlusCommissionEmployee, and now PieceWorker).
For each Employee, display its String representation and earnings.
Submit this assignment by 11:59 p.m. (ET) on Monday of Module/Week 3.
// Fig. 10.7: CommissionEmployee.java
// CommissionEmployee class extends Employee.
public class CommissionEmployee extends Employee 
{
   private double grossSales; // gross weekly sales
   private double commissionRate; // commission percentage
   // constructor
   public CommissionEmployee(String firstName, String lastName, 
      String socialSecurityNumber, double grossSales, 
      double commissionRate)
   {
      super(firstName, lastName, socialSecurityNumber);
      if (commissionRate <= 0.0 || commissionRate >= 1.0) // validate 
         throw new IllegalArgumentException(
            "Commission rate must be > 0.0 and < 1.0");
      if (grossSales < 0.0) // validate
         throw new IllegalArgumentException("Gross sales must be >= 0.0");
      this.grossSales = grossSales;
      this.commissionRate = commissionRate;
   } 
   // set gross sales amount
   public void setGrossSales(double grossSales)
   {
      if (grossSales < 0.0) // validate
         throw new IllegalArgumentException("Gross sales must be >= 0.0");
      this.grossSales = grossSales;
   } 
   // return gross sales amount
   public double getGrossSales()
   {
      return grossSales;
   } 
   // set commission rate
   public void setCommissionRate(double commissionRate)
   {
      if (commissionRate <= 0.0 || commissionRate >= 1.0) // validate
         throw new IllegalArgumentException(
            "Commission rate must be > 0.0 and < 1.0");
      this.commissionRate = commissionRate;
   } 
   // return commission rate
   public double getCommissionRate()
   {
      return commissionRate;
   } 
   // calculate earnings; override abstract method earnings in Employee
   @Override                                                           
   public double earnings()                                            
   {                                                                   
      return getCommissionRate() * getGrossSales();                    
   }                                             
   // return String representation of CommissionEmployee 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());             
   } 
} // end class CommissionEmployee
// Fig. 10.8: BasePlusCommissionEmployee.java
// BasePlusCommissionEmployee class extends CommissionEmployee.
public class BasePlusCommissionEmployee extends CommissionEmployee 
{
   private double baseSalary; // base salary per week
   // constructor
   public BasePlusCommissionEmployee(String firstName, String lastName, 
      String socialSecurityNumber, double grossSales,
      double commissionRate, double baseSalary)
   {
      super(firstName, lastName, socialSecurityNumber, 
         grossSales, commissionRate);
      if (baseSalary < 0.0) // validate baseSalary                  
         throw new IllegalArgumentException("Base salary must be >= 0.0");
            
      this.baseSalary = baseSalary;                
   }
   // set base salary
   public void setBaseSalary(double baseSalary)
   {
      if (baseSalary < 0.0) // validate baseSalary                  
         throw new IllegalArgumentException("Base salary must be >= 0.0");
            
      this.baseSalary = baseSalary;                
   } 
   // return base salary
   public double getBaseSalary()
   {
      return baseSalary;
   }
   // calculate earnings; override method earnings in CommissionEmployee
   @Override                                                            
   public double earnings()                                             
   {                                                                    
      return getBaseSalary() + super.earnings();                        
   } 
   // return String representation of BasePlusCommissionEmployee object
   @Override                                                           
   public String toString()                                            
   {                                                                   
      return String.format("%s %s; %s: $%,.2f",                       
         "base-salaried", super.toString(),                            
         "base salary", getBaseSalary());                             
   } 
} // end class BasePlusCommissionEmployee
// Fig. 10.4: Employee.java
// Employee abstract superclass.
public abstract class Employee 
{
   private final String firstName;
   private final String lastName;
   private final String socialSecurityNumber;
   // constructor
   public Employee(String firstName, String lastName, 
      String socialSecurityNumber)
   {
      this.firstName = firstName;                                    
      this.lastName = lastName;                                    
      this.socialSecurityNumber = socialSecurityNumber;         
   } 
   // return first name
   public String getFirstName()
   {
      return firstName;
   } 
   // return last name
   public String getLastName()
   {
      return lastName;
   } 
   // return social security number
   public String getSocialSecurityNumber()
   {
      return socialSecurityNumber;
   } 
   // return String representation of Employee object
   @Override
   public String toString()
   {
      return String.format("%s %s%nsocial security number: %s", 
         getFirstName(), getLastName(), getSocialSecurityNumber());
   } 
   // abstract method must be overridden by concrete subclasses
   public abstract double earnings(); // no implementation here
} // end abstract class Employee
// Fig. 10.6: HourlyEmployee.java
// HourlyEmployee class extends Employee.
public class HourlyEmployee extends Employee 
{
   private double wage; // wage per hour
   private double hours; // hours worked for week
   // constructor
   public HourlyEmployee(String firstName, String lastName,
      String socialSecurityNumber, double wage, double hours)
   {
      super(firstName, lastName, socialSecurityNumber);
      if (wage < 0.0) // validate wage
         throw new IllegalArgumentException(
            "Hourly wage must be >= 0.0");
      if ((hours < 0.0) || (hours > 168.0)) // validate hours
         throw new IllegalArgumentException(
            "Hours worked must be >= 0.0 and <= 168.0");
      this.wage = wage;
      this.hours = hours;
   } 
   // set wage
   public void setWage(double wage)
   {
      if (wage < 0.0) // validate wage
         throw new IllegalArgumentException(
            "Hourly wage must be >= 0.0");
      this.wage = wage;
   } 
   // return wage
   public double getWage()
   {
      return wage;
   } 
   // set hours worked
   public void setHours(double hours)
   {
      if ((hours < 0.0) || (hours > 168.0)) // validate hours
         throw new IllegalArgumentException(
            "Hours worked must be >= 0.0 and <= 168.0");
      this.hours = hours;
   } 
   // return hours worked
   public double getHours()
   {
      return hours;
   } 
   // calculate earnings; override abstract method earnings in Employee
   @Override                                                           
   public double earnings()                                            
   {                                                                   
      if (getHours() <= 40) // no overtime                           
         return getWage() * getHours();                                
      else
         return 40 * getWage() + (getHours() - 40) * getWage() * 1.5;
   }                                          
   // return String representation of HourlyEmployee object              
   @Override                                                             
   public String toString()                                              
   {                                                                     
      return String.format("hourly employee: %s%n%s: $%,.2f; %s: %,.2f",
         super.toString(), "hourly wage", getWage(),                     
         "hours worked", getHours());                                   
   }                                    
} // end class HourlyEmployee
// Fig. 10.9: PayrollSystemTest.java
// Employee hierarchy test program.
public class PayrollSystemTest 
{
   public static void main(String[] args) 
   {
      // create subclass objects
      SalariedEmployee salariedEmployee = 
         new SalariedEmployee("John", "Smith", "111-11-1111", 800.00);
      HourlyEmployee hourlyEmployee = 
         new HourlyEmployee("Karen", "Price", "222-22-2222", 16.75, 40);
      CommissionEmployee commissionEmployee = 
         new CommissionEmployee(
         "Sue", "Jones", "333-33-3333", 10000, .06);
      BasePlusCommissionEmployee basePlusCommissionEmployee = 
         new BasePlusCommissionEmployee(
         "Bob", "Lewis", "444-44-4444", 5000, .04, 300);
      System.out.println("Employees processed individually:");
      
      System.out.printf("%n%s%n%s: $%,.2f%n%n", 
         salariedEmployee, "earned", salariedEmployee.earnings());
      System.out.printf("%s%n%s: $%,.2f%n%n",
         hourlyEmployee, "earned", hourlyEmployee.earnings());
      System.out.printf("%s%n%s: $%,.2f%n%n",
         commissionEmployee, "earned", commissionEmployee.earnings());
      System.out.printf("%s%n%s: $%,.2f%n%n", 
         basePlusCommissionEmployee, 
         "earned", basePlusCommissionEmployee.earnings());
      // create four-element Employee array
      Employee[] employees = new Employee[4]; 
      // initialize array with Employees
      employees[0] = salariedEmployee;
      employees[1] = hourlyEmployee;
      employees[2] = commissionEmployee; 
      employees[3] = basePlusCommissionEmployee;
      System.out.printf("Employees processed polymorphically:%n%n");
      
      // generically process each element in array employees
      for (Employee currentEmployee : employees) 
      {
         System.out.println(currentEmployee); // invokes toString
         // determine whether element is a BasePlusCommissionEmployee
         if (currentEmployee instanceof BasePlusCommissionEmployee) 
         {
            // downcast Employee reference to 
            // BasePlusCommissionEmployee reference
            BasePlusCommissionEmployee employee = 
               (BasePlusCommissionEmployee) currentEmployee;
            employee.setBaseSalary(1.10 * employee.getBaseSalary());
            System.out.printf(
               "new base salary with 10%% increase is: $%,.2f%n",
               employee.getBaseSalary());
         } 
         System.out.printf(
            "earned $%,.2f%n%n", currentEmployee.earnings());
      } 
      // get type name of each object in employees array
      for (int j = 0; j < employees.length; j++)
         System.out.printf("Employee %d is a %s%n", j, 
            employees[j].getClass().getName()); 
   } // end main
} // end class PayrollSystemTest
// Fig. 10.5: SalariedEmployee.java
// SalariedEmployee concrete class extends abstract class Employee.
public class SalariedEmployee extends Employee 
{
   private double weeklySalary;
   // constructor
   public SalariedEmployee(String firstName, String lastName, 
      String socialSecurityNumber, double weeklySalary)
   {
      super(firstName, lastName, socialSecurityNumber); 
      if (weeklySalary < 0.0)
         throw new IllegalArgumentException(
            "Weekly salary must be >= 0.0");
      this.weeklySalary = weeklySalary;
   } 
   // set salary
   public void setWeeklySalary(double weeklySalary)
   {
      if (weeklySalary < 0.0)
         throw new IllegalArgumentException(
            "Weekly salary must be >= 0.0");
      this.weeklySalary = weeklySalary;
   } 
   // return salary
   public double getWeeklySalary()
   {
      return weeklySalary;
   } 
   // calculate earnings; override abstract method earnings in Employee
   @Override                                                           
   public double earnings()                                            
   {                                                                   
      return getWeeklySalary();                                        
   }                                             
   // return String representation of SalariedEmployee object   
   @Override                                                    
   public String toString()                                     
   {                                                            
      return String.format("salaried employee: %s%n%s: $%,.2f",
         super.toString(), "weekly salary", getWeeklySalary());
   } 
} // end class SalariedEmployee