RecurrenceRule rule = new RecurrenceRule("FREQ=YEARLY;BYMONTHDAY=23;BYMONTH=5");
	
	DateTime start = new DateTime(1982, 4 /* 0-based month numbers! */,23);

	RecurrenceRuleIterator it = rule.iterator(start);

	int maxInstances = 100; // limit instances for rules that recur forever

	while (it.hasNext() && (!rule.isInfinite() || maxInstances-- > 0))
	{
		DateTime nextInstance = it.nextDateTime();
		// do something with nextInstance
	}

	// create a recurence set
	RecurrenceSet rset = new RecurrenceSet();

	// add instances from a recurrence rule
	// you can add any number of recurrence rules or RDATEs (RecurrenceLists).
	rset.addInstances(new RecurrenceRuleAdapter(rule));

	// optionally add exceptions
	// rset.addExceptions(new RecurrenceList(timestamps));

	// get an iterator
	RecurrenceSetIterator iterator = rset.iterator(start.getTimeZone(), start.getTimestamp());

	while (iterator.hasNext() && --limit >= 0)
	{
		long nextInstance = iterator.next();
		// do something with nextInstance
	}

	RecurrenceRule rule1 = new RecurrenceRule("FREQ=WEEKLY;BYWEEKNO=1,2,3,4;BYDAY=SU", RfcMode.RFC2445_STRICT);
	// -> will iterate Sunday in the first four weeks of the year


	RecurrenceRule rule2 = new RecurrenceRule("FREQ=WEEKLY;BYWEEKNO=1,2,3,4;BYDAY=SU", RfcMode.RFC2445_LAX);
	// -> will iterate Sunday in the first four weeks of the year (just like RfcMode.RFC2445_STRICT)


	RecurrenceRule rule3 = new RecurrenceRule("FREQ=WEEKLY;BYWEEKNO=1,2,3,4;BYDAY=SU", RfcMode.RFC5545_STRICT);
	// -> will throw an InvalidRecurrenceRuleExceptionException because in RFC 5545 BYWEEKNO is only valid in
	// combination to YEARLY rules


	RecurrenceRule rule4 = new RecurrenceRule("FREQ=WEEKLY;BYWEEKNO=1,2,3,4;BYDAY=SU", RfcMode.RFC5545_LAX);
	// -> will iterate every Sunday of the year
	// since BYWEEKNO is not valid in WEEKLY rules this part is just dropped and the rule left is "FREQ=WEEKLY;BYDAY=SU"


	RecurrenceRule rule5 = new RecurrenceRule("BYWEEKNO=1,2,3,4;BYDAY=SU;FREQ=WEEKLY", RfcMode.RFC2445_STRICT);
	// -> will throw an InvalidRecurrenceRuleExceptionException because in RFC 2445 the rule must start with "FREQ="


	RecurrenceRule rule6 = new RecurrenceRule("FREQ=MONTHLY;BYMONTH=4;", RfcMode.RFC2445_STRICT);
	// -> will throw an InvalidRecurrenceRuleExceptionException because the trailing ";" is invalid

	RecurrenceRule rule = new RecurrenceRule(Freq.MONTHLY); // will create a new rule using RfcMode.RFC5545_STRICT mode

	rule.setCount(20);

	// note that unlike with java.util.Calendar the months in this list are 1-based not 0-based
	rule.setByRule(Parts.BYMONTH, 1, 3, 5, 7);

	rule.setByRule(Parts.BYMONTHDAY, 4, 8, 12);

	/*
	 * Alternatively set the values from a list or an array:
	 */ 
	Integer[] dayArray = new Integer[]{4, 8, 12};
	rule.setByRule(Parts.BYMONTHDAY, dayArray);
	
	List<Integer> dayList = Arrays.asList(dayArray);
	rule.setByRule(Parts.BYMONTHDAY, dayList);

	String ruleStr = rule.toString(); 
	// ruleStr is "FREQ=MONTHLY;BYMONTH=1,3,5,7;BYMONTHDAY=4,8,12;COUNT=20"