class Solution {    public List
     
      
       > groupAnagrams(String[] strs) {        Map
       
        
         > map=new HashMap
         
          >();        for(String str: strs)        {            char[] arr=str.toCharArray();            Arrays.sort(arr);            String key=new String(arr);            if(!map.containsKey(key))                map.put(key, new ArrayList
          
           ()); map.get(key).add(str); } return new ArrayList
           
            
             >(map.values()); }}