public static ArrayList
     
       removeDuplicate(List
      
        room) {		 Set
       
         set = new TreeSet
        
         (new Comparator
         
          () {			 @Override			 public int compare(Room o1, Room o2) {				 //字符串,则按照asicc码升序排列				 return o1.getId().compareTo(o2.getId());			 }		 });		 set.addAll(room);		 return new ArrayList
          
           (set); }