java获得一年内的所有双休日

public static Set<String> getYearDoubleWeekend(int year){
		 Set<String> listDates = new HashSet<String>();
		 Calendar calendar=Calendar.getInstance();//当前日期
		  calendar.set(year, 6, 1);
		  Calendar nowyear=Calendar.getInstance();
		  Calendar nexty=Calendar.getInstance();
		  nowyear.set(year, 0, 1);//2010-1-1
		  nexty.set(year+1, 0, 1);//2011-1-1
		  calendar.add(Calendar.DAY_OF_MONTH, -calendar.get(Calendar.DAY_OF_WEEK));//周六
		  Calendar c=(Calendar) calendar.clone();
		 for(;calendar.before(nexty)&&calendar.after(nowyear);calendar.add(Calendar.DAY_OF_YEAR, -7)){
			  listDates.add(calendar.get(Calendar.YEAR)+"-"+(1+calendar.get(Calendar.MONTH))+"-"+calendar.get(Calendar.DATE));
			  listDates.add(calendar.get(Calendar.YEAR)+"-"+(1+calendar.get(Calendar.MONTH))+"-"+(1+calendar.get(Calendar.DATE)));
		  }
		for(;c.before(nexty)&&c.after(nowyear);c.add(Calendar.DAY_OF_YEAR, 7)){
			 listDates.add(c.get(Calendar.YEAR)+"-"+(1+c.get(Calendar.MONTH))+"-"+c.get(Calendar.DATE));
			 listDates.add(c.get(Calendar.YEAR)+"-"+(1+c.get(Calendar.MONTH))+"-"+(1+c.get(Calendar.DATE)));
		  }
		  return listDates;
	 };public static void main(String[] args) {
		System.out.println(getYearDoubleWeekend(2018));
	}

传入你想得到的双休日的年份即可