List<HashMap>排序，List内存分页

 Collections.sort(list, new Comparator<HashMap>() {
                        public int compare(HashMap o1, HashMap o2) {
                            Integer name1 = Integer.valueOf(o1.get("tm_linenumber").toString());//name1是从你list里面拿出来的一个，根据你需要排序的字段进行设置相应的类型，如果需要倒序就把两个对象对调一下
                            Integer name2 = Integer.valueOf(o2.get("tm_linenumber").toString()); //name1是从你list里面拿出来的第二个name
                            return name1.compareTo(name2);
                        }
                    });

Integer fromIndex = (pageIndex - 1) * pageSize;
Integer toIndex = fromIndex + pageSize;
Iterator<Map.Entry<String, List<HashMap>>> iterator = resultMap.entrySet().iterator();
HashMap<String, List<HashMap>> hashMap = new HashMap<>();
while (iterator.hasNext()) {
    Map.Entry<String, List<HashMap>> entry = iterator.next();
    List<HashMap> list = entry.getValue();
    if (fromIndex > (list.size() - 1)) {
        hashMap.put(entry.getKey(), new ArrayList<>());
    } else {
        //regin 数据内存排序 xun-yu.she

        //list.get(1).put("tm_linenumber", "7");
        //list.get(2).put("tm_linenumber", "2");
        //list.get(5).put("tm_linenumber", "a");
        try {
            Collections.sort(list, new Comparator<HashMap>() {
                public int compare(HashMap o1, HashMap o2) {
                    Integer name1 = Integer.valueOf(o1.get("tm_linenumber").toString());//name1是从你list里面拿出来的一个
                    Integer name2 = Integer.valueOf(o2.get("tm_linenumber").toString()); //name1是从你list里面拿出来的第二个name
                    return name1.compareTo(name2);
                }
            });

        } catch (Exception e) {
            //排序失败
            restResult.setMsg("sort error " + e.getMessage());
        }
        //endregion
        List<HashMap> hashMaps = list.subList(fromIndex, toIndex > (list.size() - 1) ? list.size() : toIndex);
        hashMap.put(entry.getKey(), hashMaps);
    }
}