// File: TestHashtable4.java
//
// Author: Rahul Simha
// Created: Sept 23, 1998
//
// Illustrates use of library Hashtable
// for any object with an object key.

import java.util.Hashtable;

class NameAge {
  String name;
  int age;
  // Constructor.
  public NameAge (String nameInit, int ageInit)
  {
    name = nameInit;  age = ageInit;
  }
  // Override toString()
  public String toString ()
  {
    return "Name=" + name + ", Age=" + age;
  }

  // Overrides Object's hashCode()
  public int hashCode()
  {
    // Shift name's hashCode left by 8 bits.
    return 256*name.hashCode() + age;
  }

  // Overrides Object's equals()
  public boolean equals (Object obj)
  {
    NameAge n = (NameAge) obj;
    if ( (name.equals(n.name)) && (age==n.age) )
      return true;
    else
      return false;
  }

}

class Person {

  // Instance data.
  NameAge na;
  String nickname;

  // Constructor.
  public Person (String nameInit, int ageInit, String nickInit)
  {
    na = new NameAge (nameInit, ageInit);
    nickname = nickInit;
  }

  // Overrides Object's toString()
  public String toString()
  {
    return "Person: " + na + ", nickname=" + nickname;
  }

  // Accessor for NameAge so that it can be used as key.
  public NameAge getNameage ()
  {
    return na;
  }

}


public class TestHashtable4 {

  public static void insert (Hashtable h, Person p)
  {
    Person p2 = (Person) h.put (p.getNameage(), p);
    if (p2 != null) 
      System.out.println ("Warning: " + p + " replaced " + p2);
  }

  public static void main (String[] argv)
  {
    Hashtable h = new Hashtable ();

    insert (h, new Person ("Franco", 25, "Flatulent Franco"));
    insert (h, new Person ("Gita", 18, "Gluttonous Gita"));
    insert (h, new Person ("Heinrich", 43, "Hemorrhaging Heinrich"));

    // When retrieving you get the whole object back.
    Person p = (Person) h.get (new NameAge ("Heinrich", 43));
    System.out.println (p);  
  }

}