// File: TestPoly3.java
//
// Author: Rahul Simha
// Created: Sept 16, 1998
// Modified: Sept, 2008
//
// Illustrates what can go wrong when down-casting.

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

  // New constructor.
  public Customer (String nameIn, String ssnIn, int loyaltyIn)
  {
    // This is like calling Person (nameIn, ssnIn).
    super (nameIn, ssnIn);

    // Subclass data.
    loyalty = loyaltyIn;
  }

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

} // End of class "Customer"



// Testing.

public class TestPoly3 {

  public static void main (String[] argv)
  {
    Customer c = new Customer ("Gullible Gus", "555-55-5678", 5);
    Person p = new Person ("Zany Zoe", "112-12-1212");

    // This is OK because p2 is really a Customer:
    Person p2 = c;
    Customer c2 = (Customer) p2;

    // This will generate a run-time exception
    // because p is not a Customer:
    Customer c3 = (Customer) p;
  }
} // End of class "TestPoly3"