Java에서 서수 표시기를 사용하여 월의 날짜 형식을 어떻게 지정합니까?

import static com.google.common.base.Preconditions.*;

public class DayOfMonthOrdinal {

    public static String getDayOfMonthSuffix(final int n) {
        checkNotNull(n);
        checkArgument(n >= 1 && n <= 31, "illegal day of month: " + n);
        if (n >= 11 && n <= 13) {
            return "th";
        }
        switch (n % 10) {
            case 1:
                return "st";
            case 2:
                return "nd";
            case 3:
                return "rd";
            default:
                return "th";
        }
    }

    public static void main(String[] args) {
        System.out.println(getDayOfMonthSuffix(11)); // 11th
        System.out.println(getDayOfMonthSuffix(21)); // 21st
        System.out.println(getDayOfMonthSuffix(23)); // 23rd
    }
}