遍历List 按照类型分类组装map对象

??? private Map<String, List<A>> getMap(List<A> a,List<B> b)
??? ??? ??? throws SQLException {
??? ?
??? ??? Map<String,List<A>> retmap = new HashMap<String,List<A>>();
??? ???
??? ??? Map midMap1 = new HashedMap();
??? ???
??? ??? for (A obj : a) {
??? ??? ??? ?
??? ??? ??? midMap1.put("K_"+obj.getId(), obj);
??? ??? }
??? ???
??? ???
??? ??? for (B obj : b) {
??? ??? ??? ?
??? ??? ??? if(midMap1.get("K_"+obj.getId())!=null)
??? ??? ??? {
??? ??? ???
??? ??? ??? ???
??? ??? ??? ??? if(retmap.get(""+obj.getType()) ==null)
??? ??? ??? ??? {
??? ??? ??? ??? ??? retmap.put( ""+obj.getType(), new ArrayList());
??? ??? ??? ??? }
??? ??? ??? ??? List ls = (ArrayList)retmap.get(""+obj.getType());
??? ??? ??? ??? ls.add(midMap1.get("K_"+obj.getId())) ;
??? ??? ??? ??? retmap.put(""+obj.getType(), ls);
??? ??? ??? }
??? ??? }
??? ???
??? ???
??? ??? return retmap;
??? }