add solution for Valid-anagram

Author: Hyeri1ee

valid-anagram/Hyeri1ee.java

@@ -0,0 +1,34 @@
+import java.util.*;
+
+class Solution {
+    public boolean isAnagram(String s, String t) {
+        if (s.length() != t.length()) return false;
+
+        //s를 hashmap에 저장하고, t에서 하나씩 없애기
+        HashMap<Character, Integer> maps = new HashMap<>();
+
+        for(int i =0 ; i < s.length(); i++){
+            char c = s.charAt(i);
+
+            if (maps.containsKey(c)) maps.put(c, maps.get(c)+1);
+            else maps.put(c, 1);
+                
+        }
+
+        for(int i = 0; i< t.length() ;i++){
+            char c = t.charAt(i);
+            if (maps.containsKey(c)){
+                if (maps.get(c) > 1) maps.put(c, maps.get(c) - 1);
+                else maps.remove(c);
+            }
+        }
+
+
+        if (maps.size() == 0) return true;
+
+        return false;
+       
+
+        
+    }
+}