wedding clink count

package wedding;

public class Wedding {

    private static final int PERSON_COUNT = 14;
    private static final String CLINK_COUNT_MESSAGE = "You hear the %d persons %d times clinking their glasses.";
    private static final String ILLEGAL_PERSON_COUNT_MESSAGE = "Person count smaller 0 not allowed.";

    private final int personCount;

    public static void main(String[] args) {
        Wedding wedding = new Wedding(PERSON_COUNT);

        int clinkCount = wedding.countClinkCount();
        System.out.printf(CLINK_COUNT_MESSAGE, wedding.getPersonCount(), clinkCount);
    }

    public Wedding(int personCount) {
        if (personCount < 0) {
            throw new IllegalArgumentException(ILLEGAL_PERSON_COUNT_MESSAGE);
        }

        this.personCount = personCount;
    }

    public int getPersonCount() {
        return personCount;
    }

    public int countClinkCount() {
        int clinkCount = 0;
        for (int i = 0; i < personCount; i++) {
            for (int j = i + 1; j < personCount; j++) {
                clinkCount++;
            }
        }

        return clinkCount;
    }
}