List去除重复元素

 1 List<Map<String,Object>> newList 
 2 = new ArrayList<Map<String,Object>>();
 3         Set<Set<String>> keysSet = new HashSet<Set<String>>();
 4         for(Map<String, Object> map : list){
 5             Set<String> keys = map.keySet();
 6             int beforeSize = keysSet.size();
 7             keysSet.add(keys);
 8             int afterSize = keysSet.size();
 9             if(afterSize == beforeSize + 1){
10                 newList.add(map);
11             }
12         }
13 return newList;

 1 List<Map<String,Object>> newList 
 2 = new ArrayList<Map<String,Object>>();
 3         Set<Map<String,Object>> mapSet
 4        = new HashSet<Map<String,Object>>();
 5         for(Map<String, Object> map : list) {
 6             mapSet.add(map);
 7         }
 8 Iterator<Map<String, Object>> iteratormap=mapSet.iterator();
 9    while(iteratormap.hasNext()){
10          newList.add(iteratormap.next());
11    }
12 return newList;