public static LinkedHashSet<String> yearAndQuarter(Date startDate, Date endDate) {
		if (startDate == null || endDate == null) {
			return new LinkedHashSet<String>(0);
		}
		return yearAndQuarter(startDate.getTime(), endDate.getTime());
	}
public static LinkedHashSet < String > yearAndQuarter ( Date startDate , Date endDate ) { if ( startDate == null || endDate == null ) { return new LinkedHashSet < String > ( 0 ) ; } return yearAndQuarter ( startDate . getTime ( ) , endDate . getTime ( ) ) ; }
获得指定日期区间内的年份和季节<br>

@param startDate 起始日期（包含）
@param endDate 结束日期（包含）
@return 季度列表 ，元素类似于 20132