diff --git a/programmers/신규 아이디 추천/solution.java b/programmers/신규 아이디 추천/solution.java
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index 0000000..a23a404
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+++ b/programmers/신규 아이디 추천/solution.java	
@@ -0,0 +1,24 @@
+// [문제 링크]: https://school.programmers.co.kr/learn/courses/30/lessons/72410?language=java
+
+class Solution {
+    public String solution(String new_id) {
+        String answer = "";
+        answer = new_id.toLowerCase().replaceAll("[^a-z0-9[-]_[.]]","").replaceAll("[.]+",".");
+        if(answer.charAt(0) == '.') answer = answer.substring(1);
+        int len = answer.length();
+        if(len == 0) answer = "a";
+        len = answer.length();
+        if(len >= 16) answer = answer.substring(0,15);
+        while(answer.charAt(answer.length()-1)=='.'){
+            answer = answer.substring(0,answer.length()-1);
+        }
+        len = answer.length();
+        if (len <= 2){
+            for(int i = 0; i < 3-len; i++){
+                answer += answer.charAt(len-1);
+            } 
+        }
+        
+        return answer;
+    }
+}
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