_49.java

package com.fishercoder.solutions;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class _49 {

    public static class Solution1 {
        public List<List<String>> groupAnagrams(String[] strs) {
            Map<String, List<String>> map = new HashMap<>();
            for (String word : strs) {
                char[] c = word.toCharArray();
                Arrays.sort(c);
                String key = new String(c);
                if (!map.containsKey(key)) {
                    map.put(key, new ArrayList<>());
                }
                map.get(key).add(word);
            }
            return new ArrayList<>(map.values());
        }
    }
}