From 25adb649e3d167f775a84cdb3a8af85dbe963547 Mon Sep 17 00:00:00 2001
From: Gonzalo Diaz <devel@gon.cl>
Date: Mon, 14 Apr 2025 10:35:38 -0400
Subject: [PATCH] [Hacker Rank] Interview Preparation Kit: Dictionaries and
 Hashmaps: Frequency Queries. Clean Code: explicit methods.

---
 .../FrequencyQueries.java                     | 20 ++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/algorithm-exercises-java/src/main/java/ae/hackerrank/interview_preparation_kit/dictionaries_and_hashmaps/FrequencyQueries.java b/algorithm-exercises-java/src/main/java/ae/hackerrank/interview_preparation_kit/dictionaries_and_hashmaps/FrequencyQueries.java
index 9d6ba06..c4451c5 100644
--- a/algorithm-exercises-java/src/main/java/ae/hackerrank/interview_preparation_kit/dictionaries_and_hashmaps/FrequencyQueries.java
+++ b/algorithm-exercises-java/src/main/java/ae/hackerrank/interview_preparation_kit/dictionaries_and_hashmaps/FrequencyQueries.java
@@ -87,13 +87,27 @@ void delete(Long value) {
     }
   }
 
+  void reset() {
+    this.result = new ArrayList<>();
+  }
+
+  void select(Long value) {
+    this.result.add(this.freqMap.containsKey(value) ? __FOUND__ : __NOT_FOUND__);
+  }
+
+  static FrequencyQueries factory() {
+    FrequencyQueries fq = new FrequencyQueries();
+    fq.reset();
+
+    return fq;
+  }
+
   /**
    * FrequencyQueries.
    */
   static List<Integer> freqQuery(List<List<Integer>> queries) {
 
-    FrequencyQueries fq = new FrequencyQueries();
-    fq.result = new ArrayList<>();
+    FrequencyQueries fq = FrequencyQueries.factory();
 
     for (List<Integer> query : queries) {
       int operation = query.get(0);
@@ -109,7 +123,7 @@ static List<Integer> freqQuery(List<List<Integer>> queries) {
 
           break;
         case __SELECT__:
-          fq.result.add(fq.freqMap.containsKey(value) ? __FOUND__ : __NOT_FOUND__);
+          fq.select(value);
           break;
         default:
           throw new IllegalArgumentException(