List > 同key的value全部累加合並

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("張三", new Integer(92));
        map2.put("李四", new Integer(85));
        map3.put("張三", 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>();// 保證循序

        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()){
            //如果需要將map再做list，在這里處理
            System.out.println(entry.getKey() + "," + entry.getValue());
        }
         
    }