add solution for group anagrams

Author: Hyeri1ee

group-anagrams/Hyeri1ee.java

@@ -0,0 +1,30 @@
+import java.util.*;
+
+class Solution {
+    //static HashMap<
+    public List<List<String>> groupAnagrams(String[] strs) {
+        HashMap<String, List<String>> map  = new HashMap<>();
+
+        for(int w = 0 ;w < strs.length; w++){
+            String word = strs[w];
+            char[] arr = word.toCharArray();
+
+            //정렬한거
+            Arrays.sort(arr);
+            String newWord = new String(arr);
+
+            map.putIfAbsent(newWord, new ArrayList<>());
+            map.get(newWord).add(word);
+
+        }
+
+
+        List<List<String>> list = new ArrayList<>();
+        for(List<String> group : map.values()){
+            list.add(group);
+        }
+
+        return list;
+    }
+}
+