final public class Person implements Comparable{
	private String name;
	private int born;

	public Person(String name, int born){
		this.name = name;
		this.born = born;
	}

	public int age(){
		return 2004-born;
	}

	public int compareTo(Object o){
		Person other = (Person) o;
		return this.name.compareTo(other.name);
	}

	public String toString(){
		return name + " of age " + age();
	}

	public boolean equals(Object other){
		if ( other == null)
			return false;
		if ( other == this )
			return true;
		if ( ! (other instanceof Person ) )
			return false;
		Person otherPerson = (Person) other;
		return
			otherPerson.name.equals(this.name) &&
			otherPerson.born == this.born;
	}

	/* The hashCode returns an integer which is used
	 * in connection with hashtables. The documentation
	 * of the hashCode method states that:
	 " The general contract of hashCode is:
	 - Whenever it is invoked on the same object more
	   than once during an execution of a Java application,
	   the hashCode method must consistently return the same
	   integer, provided no information used in equals
	   comparisons on the object is modified. This integer need
	   not remain consistent from one execution of an application
	   to another execution of the same application.
	 - If two objects are equal according to the equals(Object)
	   method, then calling the hashCode method on each of the
	   two objects must produce the same integer result.
	 - It is not required that if two objects are unequal
	   according to the equals(java.lang.Object) method,
	   then calling the hashCode method on each of the two
	   objects must produce distinct integer results.
	   However, the programmer should be aware that producing
	   distinct integer results for unequal objects may improve
	   the performance of hashtables. "
	*/
	public int hashCode(){
		return this.name.hashCode() + born;
	}

	public final static Person[] testPersons = {
		new Person("Lars Jensen", 1988),
		new Person("Mette von Mosenberg", 1974),
		new Person("Didrich Hesselholm", 1937),
		new Person("Signe Johansen", 1981),
		new Person("Mumbassa Swanson", 1972)};
}