递归-删除重复项

试试这个：

    public static void removeDuplicates(ArrayList<Integer> list, int counter){        if(list == null){ throw new NullPointerException();        }        if(counter < list.size()){ if(list.contains(list.get(counter))){     if(list.lastIndexOf(list.get(counter))!=counter)     {         list.remove(list.lastIndexOf(list.get(counter)));         counter--;     } } removeDuplicates(list, ++counter);        }    }