Java中Map按照value排序

HashMap<Character, Integer> map = new HashMap<>();
('a',325);
('b',32);

• 仅对value进行排序(不要key)

ArrayList<Integer> list = new ArrayList<>(());
(list);

• 对value进行排序(要key)

ArrayList<<Character, Integer>> list = new ArrayList(());
(list, (a, b)-> {
    return () - () ;
});