java刪除set集合的一條屬性

for(Iterator<Work_Log> it=iterator.iterator();it.hasNext();) {
                Work_Log next = it.next();
                boolean flag= DateUtil.getSunday().getTime() >= sdf.parse(next.getPlanDate()).getTime() && sdf.parse(next.getPlanDate()).getTime()>=DateUtil.getMonday().getTime();
//                boolean flas = "".equals(next.getWorkPlan());
                if ("本週總結".equals(next.getWeek()) && !flag){
                    it.remove();
                };
            }