Page 572 - Introduction to Programming with Java: A Problem Solving Approach

538 Chapter 13 Inheritance and Polymorphism
To execute these additional classes, we need a Payroll3 class like that shown in Figure 13.17.
The Payroll3 class adds two more objects (Glen and Carol) to the array. Then it uses those objects to call the addSales methods in the new classes. To make these method calls, we cast the array elements into the interface type. The compiler requires a cast because the addSales method does not appear in the
/**************************************************************
*
Payroll3.java
Dean & Dean
This class hires and pays four different types of employees.
**************************************************************/
*
*
*
public class Payroll3
{
}
// end class Payroll3
public static void main(String[] args)
{
}
// end main
Employee2[] employees = new Employee2[100];
Hourly2 hourly;
employees[0] = new Hourly2("Anna", 25.0);
employees[1] = new Salaried2("Simon", 48000);
employees[2] = new Hourly2("Donovan", 20.0);
employees[3] = new Commissioned("Glen");
employees[4] = new SalariedAndCommissioned("Carol", 24000);
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((Commission) employees[4]).addSales(15000);
((Commission) employees[3]).addSales(15000);
// This arbitrarily assumes that the payroll's month
// starts on a Tuesday (day = 2), and it contains 30 days.
for (int date=1,day=2; date<=15; date++,day++,day%=7)
{
for (int i=0;
i<employees.length && employees[i] != null; i++)
if (day > 0 && day < 6
&& employees[i] instanceof Hourly2)
hourly = (Hourly2) employees[i];
hourly.addHours(8);
{
}
// end for i
{
}
if ((day == 5 && employees[i] instanceof Hourly2) ||
(date%15 == 0 &&
(employees[i] instanceof Salaried2 ||
employees[i] instanceof Commissioned)))
employees[i].printPay(date);
{
}
} // end for date
Figure 13.17 Driver for third version of Payroll program