桶排分类即可

class Solution {    public List
    
     
      > groupAnagrams(String[] strs) {        Map
      
       > map = new HashMap<>();        for (String str : strs) {            map.computeIfAbsent(fun(str), k -> new ArrayList<>()).add(str);        }        return new ArrayList<>(map.values());    }    public String fun(String str) {        Map
       
         map = new HashMap<>();        for (int i = 0; i < str.length(); i++) {            map.putIfAbsent(str.charAt(i), 0);            map.put(str.charAt(i), map.get(str.charAt(i)) + 1);        }        String key = "";        char[] chars = new char[map.size()];        int i = 0;        for (Character character : map.keySet()) {            chars[i++] = character;        }        Arrays.sort(chars);        for (char aChar : chars) {            key += aChar + ":" + map.get(aChar) + ",";        }        return key;    }}