Map<String,List> map1 = new HashMap() if(map1.containsKey(data.getPrpName())){ //判断key是否一样 map1.get(data.getPrpName()).add(map2); }else{ List list = new ArrayList(); list.add(map2); map1.put(data.getPrpName(),list) ; }
List list = map1.get(oe.getName());//由上所知Map1的value值装进的是个Map2 HashMap map3 = new HashMap(); HashMap map4 = new HashMap(); if(list!=null){ for(int i=0; i<list.size(); i++){ map3 = (HashMap) list.get(i); Set entries = map3.entrySet(); if (entries != null) { //使用迭代器遍历 Iterator iterator = entries.iterator(); while (iterator.hasNext()) { Map.Entry entry = (Entry) iterator.next(); Object key = entry.getKey(); Object value = entry.getValue(); //存放到map4 map4.put(key, value); } } }