// 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.*;

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 main (String[] argv)
    {
	Hashtable h = new Hashtable ();
	
	Person p = new Person ("Franco", 25, "Flatulent Franco");
	h.put (p.getNameAge(), p);
	p = new Person ("Gita", 18, "Gluttonous Gita");
	h.put (p.getNameAge(), p);
	p = new Person ("Heinrich", 43, "Hemorrhaging Heinrich");
	h.put (p.getNameAge(), p);
	
	// When retrieving you get the whole object back.
	NameAge query = new NameAge ("Heinrich", 43);
	p = (Person) h.get (query);
	System.out.println (p);  
    }
    
}