list set array subList_hashset sublist

List<Integer> cts = new ArrayList<>(ctSets);
            Set<Integer> ctSet = new HashSet<>(cts);
            List<Integer> ctss = new ArrayList<>(ctSet);

Arrays.asList（)

实现 三者之间的互转

List<Object> list = new Arraylist<>();

List<Object> subList = list.subList(0, 5);

其中subList(0, 5)取得的是下标为0到4的元素,不包含下标为5的元素.