/* Example illustrating polymorphism.
   Adapted from Barry Holmes, page 287. */

class Worker {
	
   protected String nameOfWorker;
   protected float hoursWorked;
   protected float rateOfPay;

   public Worker(String name) {
	nameOfWorker = name;
   }

   public String getName() {
	return nameOfWorker;
   }
		
   public void setHoursWorked(float hours) {
	hoursWorked = hours;
   }

   public void setRateOfPay(float rate)  {
	rateOfPay = rate;
   }

   public float grossWage() {
	return hoursWorked * rateOfPay;
   }
}

class Executive extends Worker {

   protected float annualSalary;	

   public Executive(String name) {
	super(name);
   }
	
   public void setAnnualSalary(float salary) {
	annualSalary = salary;
   }

   public float grossWage() {
	return annualSalary/12.0f;
   }
}


class PolyExample {

   static void displayGrossWage(Worker person) {	
	System.out.println(person.getName() + 
                    " earns  $" + person.grossWage());
   }
	
   public static void main(String[] args) {

	Worker storeman = new Worker("Fred");	
	storeman.setHoursWorked(40.0f);
	storeman.setRateOfPay(10.0f);
	displayGrossWage(storeman);
		
	Executive director = new Executive("Clive");
	director.setAnnualSalary(12000.0f);
		
	displayGrossWage(director);
   }
}