// File: TestPoly.java
//
// Author: Rahul Simha
// Created: Sept 16, 1998
// Modified: Sept, 2008
//
// Illustrates polymorphism

class Customer extends Person {
  
  // New data.
  int loyalty;   // Number of years as customer.

  // New constructor.
  public Customer (String nameIn, String ssnIn, int loyaltyIn)
  {
    name = nameIn;  ssn = ssnIn;  loyalty = loyaltyIn;
  }

  // Override toString()
  public String toString ()
  {
    return "Customer: name=" + name + ", " + loyalty +
           " years with the company";
  }

  // A new method.
  public double discountRate ()
  {
    if ( (loyalty >= 1) && (loyalty < 5) )
      return 0.95;  // 5% discount.
    else if ( (loyalty >= 5) && (loyalty < 10) )
      return 0.75;  // 25% discount.
    else if (loyalty >= 10)
      return 0.50;  // 50% discount.
    else 
      return 1.0;   // no discount.
  }
  
} // End of class "Customer"


class Employee extends Person {

  int salary;

  // New constructor.
  public Employee (String nameIn, String ssnIn, int salaryIn)
  {
    name = nameIn;  ssn = ssnIn;  salary = salaryIn;
  }

  // Override the toString() method in Person.
  public String toString ()
  {
    return "Employee: name=" + name + ", salary=" + salary;
  }

} // End of class "Employee"


// Testing.

public class TestPoly {

  public static void main (String[] argv)
  {
    Customer c = new Customer ("John", "123-12-1234", 2);
    // What gets printed? Customer's toString() is called.
    System.out.println (c);

    Employee e = new Employee ("Paul", "234-23-2345", 50000);
    // What gets printed? Employee's toString() is called.
    System.out.println (e);

    // Declare some Person variables.
    Person p1, p2, p3, p4;

    // Person variables can hold Person instances
    p1 = new Person ("George", "345-45-3456");
    p2 = new Person ("Ringo", "456-45-4567");

    // ... as well as subclass instances.
    p3 = c;
    p4 = e;

    System.out.println ("\nPerson data: ");

    // Calls to toString in Person.
    System.out.println (p1);
    System.out.println (p2);

    // Call to toString in Customer.
    System.out.println (p3);

    // Call to toString in Employee.
    System.out.println (p4);
  }

} // End of class "test_poly"