Figure 15: Illustrates sets

import java.util.*;

class SetTest
{
    public static void test(Set x)
    {
        // Do a search:
        Person p = new Person("Albert",1901,1,20);
        if (x.contains(p))
            System.out.println("Found " + p);

        // Misc:
        System.out.println("max == " +
                           Collections.max(x));
        System.out.println("min == " +
                           Collections.min(x));
        iterate(x);
    }

    public static void iterate(Collection c)
    {
        System.out.println("Iterating...");
        Iterator i = c.iterator();
        while (i.hasNext())
            System.out.println(i.next());
    }

    public static void main(String[] args)
    {
        // Build HashSet:
        HashSet h = new HashSet();
        h.add(new Person("Horatio", 1835,12,6));
        h.add(new Person("Charles",1897,3,11));
        h.add(new Person("Albert",1901,1,20));
        // The following is ignored:
        h.add(new Person("Albert",1901,1,20));
        System.out.println(h);
        test(h);
        System.out.println();

        // Build TreeSet:
        TreeSet t =
            new TreeSet(Collections.reverseOrder());
        t.addAll(h);
        System.out.println(t);
        test(t);

        // Extra TreeSet stuff:
        boolean ctest =
            t.comparator()
             .equals(Collections.reverseOrder());
        System.out.println("Comparator test: " + ctest);
        System.out.println("first = " + t.first());
        System.out.println("last = " + t.last());
        Person p = new Person("Charles",1897,3,11);
        System.out.println("headSet: " + t.headSet(p));
        System.out.println("tailSet: " + t.tailSet(p));
    }
}

/* Output:
[{Charles,3/11/1897}, {Albert,1/20/1901}, {Horatio,12/6/1835}]
Found {Albert,1/20/1901}
max == {Horatio,12/6/1835}
min == {Albert,1/20/1901}
Iterating...
{Charles,3/11/1897}
{Albert,1/20/1901}
{Horatio,12/6/1835}

[{Horatio,12/6/1835}, {Charles,3/11/1897}, {Albert,1/20/1901}]
Found {Albert,1/20/1901}
max == {Horatio,12/6/1835}
min == {Albert,1/20/1901}
Iterating...
{Horatio,12/6/1835}
{Charles,3/11/1897}
{Albert,1/20/1901}
Comparator test: true
first = {Horatio,12/6/1835}
last = {Albert,1/20/1901}
headSet: [{Horatio,12/6/1835}]
tailSet: [{Charles,3/11/1897}, {Albert,1/20/1901}]
*/