public class PersonDemo
{
    public static void main(String[] args)
    {
        Person bach = 
            new Person("Johann Sebastian Bach",
                 new Date("Mar", 21, 1685), new Date("Jul", 28, 1750));
        Person stravinsky = 
            new Person("Igor Stravinsky",
                 new Date("Jun", 17, 1882), new Date("Apr", 6, 1971));
        Person adams = 
            new Person("John Adams",
                 new Date("Feb", 15, 1947), null);

        System.out.println("A Short List of Composers:");
        System.out.println(bach);
        System.out.println(stravinsky);
        System.out.println(adams);

        Person bachTwin = new Person(bach);
        System.out.println("Comparing bach and bachTwin:");
        if (bachTwin == bach)
             System.out.println("Same reference for both.");
        else
             System.out.println("Distinct copies.");

        if (bachTwin.equals(bach))
             System.out.println("Same data.");
        else
             System.out.println("Not same data.");
     }
}