/*
 * file: Hash.java
 * 	Illustrates
 *		subclassing (extends)
 *		instanceof
 * 		Hashtable
 *		casting of classes
 *
 * @author Chee Yap
 * Honors Basic Algorithms, Fall 2000
 */

import java.util.Hashtable.*;

class Student {
  String name;
  int year;
  Student(){ name = "No Name";}
  Student(String n){ name = n;}
  String getName(){return name;}
} // Student class

class Junior extends Student {
  Junior(String n){ year=3;}
}

public class Hash {

 public static void main(String[] args) {

 // get new hashtable to store all students:
    java.util.Hashtable myClass = new java.util.Hashtable(); 

 // store one student: 
    myClass.put("Dipesh", new Student("Gandhi Dipesh"));

  Junior Eli = new Junior("Eli Collins");

  if (Eli instanceof Student) {
        System.out.println("Hey, I didn't know that "
                      + "Juniors are students too!");
        myClass.put(Eli.getName(), (Student)Eli);
  } else
        System.out.println("Hey, only students allowed");

 } // main
}