list排序

public static void main(String[] args) {
        List list = new ArrayList();
        list.add("a");
        list.add("e");
        list.add("b");
        list.add("c");
        list.add("d");

        list.sort((a,b)->a.compareTo(b));//[a, b, c, d, e]
        list.sort((a,b)->b.compareTo(a));//[e, d, c, b, a]

        System.out.println(list);
    }