Group Anagrams - LeetCode

Given an array of strings, group anagrams together.

Example:

Input: ["eat", "tea", "tan", "ate", "nat", "bat"],
Output:
[
  ["ate","eat","tea"],
  ["nat","tan"],
  ["bat"]
]

Note:

• All inputs will be in lowercase.
• The order of your output does not matter.

Java Solution :

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

    }
}