代码1

Runtime: 6 ms

class Solution {
    public List<List<String>> groupAnagrams(String[] strs) {
        Map<String, List<String>> map = new HashMap();
        for (String s : strs){
            char[] chars = s.toCharArray();
            Arrays.sort(chars);
            String string = new String(chars);
            map.putIfAbsent(string, new ArrayList());
            map.get(string).add(s);
        }
        
        return new ArrayList(map.values());
    }
}