public static void main(String[] args){

        List<Map<String,Object>> list1 = new ArrayList<Map<String,Object>>();

        Map<String,Object> map1 = new HashMap<String,Object>();

        Map<String,Object> map2 = new HashMap<String,Object>();

        Map<String,Object> map3 = new HashMap<String,Object>();

        map1.put("张三", new Integer(92));

        map2.put("李四", new Integer(85));

        map3.put("张三", new Integer(90));

        list1.add(map1);

        list1.add(map2);

        list1.add(map3);

        Map<String,Object> mapAll = new HashMap<String,Object>();

　　　　 //Map<String,Object> mapAll = new LinkedHashMap<String,Object>();// 保证循序

        for(Map<String,Object> map:list1){

            for(Map.Entry<String, Object> entry:map.entrySet()){

                String name = entry.getKey();

                Object score = entry.getValue();

                Object scoreAll = mapAll.get(entry.getKey());

                if(scoreAll == null){

                    mapAll.put(name, score);

                }else{

                    scoreAll = new Integer((((Integer)scoreAll).intValue() + ((Integer)score).intValue()));

                    mapAll.put(name, scoreAll);

                }

            }

        }

        for(Map.Entry<String, Object> entry:mapAll.entrySet()){

            //如果需要将map再做list，在这里处理

            System.out.println(entry.getKey() + "," + entry.getValue());

        }

    }