Изменена структура

pom.xml

@@ -31,6 +31,7 @@
         <module>vol3</module>
         <module>vol4</module>
         <module>vol5</module>
+        <module>vol6</module>
     </modules>
 
     <dependencyManagement>

vol6/pom.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>ru.mifi.practice</groupId>
+        <artifactId>AaDS</artifactId>
+        <version>2024.2</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+    <artifactId>vol6</artifactId>
+    <name>vol6</name>
+    <description>Модуль №6. Деревья</description>
+
+</project>

vol6/src/main/java/ru/mifi/practice/vol6/Counter.java

@@ -0,0 +1,32 @@
+package ru.mifi.practice.vol5;
+
+import java.util.concurrent.atomic.AtomicInteger;
+
+public interface Counter {
+    void increment();
+
+    void reset();
+
+    static Counter create() {
+        return new Default();
+    }
+
+    final class Default implements Counter {
+        private final AtomicInteger count = new AtomicInteger(0);
+
+        @Override
+        public void increment() {
+            count.incrementAndGet();
+        }
+
+        @Override
+        public void reset() {
+            count.set(0);
+        }
+
+        @Override
+        public String toString() {
+            return String.valueOf(count.intValue());
+        }
+    }
+}