如何获得一年的开始和结束日期？

Calendar cal = Calendar.getInstance();cal.set(Calendar.YEAR, 2014);cal.set(Calendar.DAY_OF_YEAR, 1);    Date start = cal.getTime();//set date to last day of 2014cal.set(Calendar.YEAR, 2014);cal.set(Calendar.MONTH, 11); // 11 = decembercal.set(Calendar.DAY_OF_MONTH, 31); // new years eveDate end = cal.getTime();//Iterate through the two dates GregorianCalendar gcal = new GregorianCalendar();gcal.setTime(start);while (gcal.getTime().before(end)) {    gcal.add(Calendar.DAY_OF_YEAR, 1);    //Do Something ...}