List 去重

    private List<Integer> getNewList(List<Integer> list){
        if(null == list || list.size()<2) return list;
        Set<Integer> set = new HashSet<Integer>();
        List<Integer> newList = new ArrayList<Integer>();
        for (Integer i:list) {
            if(set.add(i)){
                newList.add(i);
            }
        }
        return newList;
    }