diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..639900d
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
new file mode 100644
index 0000000..36099c1
--- /dev/null
+++ b/.idea/workspace.xml
@@ -0,0 +1,69 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AutoImportSettings">
+    <option name="autoReloadType" value="SELECTIVE" />
+  </component>
+  <component name="ChangeListManager">
+    <list default="true" id="337c6ce9-e8ed-4d95-b364-55effd56cf34" name="Changes" comment="">
+      <change beforePath="$PROJECT_DIR$/Flight/flightInfo.txt" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/main/java/lessons/lesson06/ReservationSystem.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/lessons/lesson06/ReservationSystem.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/main/java/lessons/lesson06/ReserveMain.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/lessons/lesson06/ReserveMain.java" afterDir="false" />
+    </list>
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="ExternalProjectsData">
+    <projectState path="$PROJECT_DIR$">
+      <ProjectState />
+    </projectState>
+  </component>
+  <component name="ExternalProjectsManager">
+    <system id="GRADLE">
+      <state>
+        <projects_view>
+          <tree_state>
+            <expand>
+              <path>
+                <item name="" type="6a2764b6:ExternalProjectsStructure$RootNode" />
+                <item name="java-course" type="f1a62948:ProjectNode" />
+              </path>
+            </expand>
+            <select />
+          </tree_state>
+        </projects_view>
+      </state>
+    </system>
+  </component>
+  <component name="Git.Settings">
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
+  </component>
+  <component name="ProjectColorInfo"><![CDATA[{
+  "associatedIndex": 5
+}]]></component>
+  <component name="ProjectId" id="33v9d9Ly4LUY5i5hyojkBY2aRpq" />
+  <component name="ProjectViewState">
+    <option name="hideEmptyMiddlePackages" value="true" />
+    <option name="showLibraryContents" value="true" />
+  </component>
+  <component name="PropertiesComponent"><![CDATA[{
+  "keyToString": {
+    "Gradle.java-course [:lessons.lesson06.ReserveMain.main()].executor": "Run",
+    "RunOnceActivity.ShowReadmeOnStart": "true",
+    "RunOnceActivity.git.unshallow": "true",
+    "git-widget-placeholder": "backup__all__lessons"
+  }
+}]]></component>
+  <component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="application-level" UseSingleDictionary="true" transferred="true" />
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="337c6ce9-e8ed-4d95-b364-55effd56cf34" name="Changes" comment="" />
+      <created>1760186764962</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1760186764962</updated>
+    </task>
+    <servers />
+  </component>
+</project>
\ No newline at end of file
diff --git a/src/main/java/lessons/lesson08/book/Book.java b/src/main/java/lessons/lesson08/book/Book.java
new file mode 100644
index 0000000..c49a200
--- /dev/null
+++ b/src/main/java/lessons/lesson08/book/Book.java
@@ -0,0 +1,16 @@
+package lessons.lesson08.book;
+
+public class Book {
+    String title, author, isbn;
+
+    Book(String title, String author, String isbn) {
+        this.title = title;
+        this.author = author;
+        this.isbn = isbn;
+    }
+
+    @Override
+    public String toString() {
+        return "ISBN: " + isbn + ", Title: " + title + ", Author: " + author;
+    }
+}
diff --git a/src/main/java/lessons/lesson08/book/Main.java b/src/main/java/lessons/lesson08/book/Main.java
new file mode 100644
index 0000000..1b9f5b2
--- /dev/null
+++ b/src/main/java/lessons/lesson08/book/Main.java
@@ -0,0 +1,18 @@
+package lessons.lesson08.book;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class Main {
+    public static void main(String[] args) {
+        Map<String, Book> books = new HashMap<>();
+        books.put("978-1-23456-789-7", new Book("Effective Java", "Joshua Bloch", "978-1-23456-789-7"));
+        books.put("978-0-98765-432-1", new Book("Clean Code", "Robert C. Martin", "978-0-98765-432-1"));
+        books.put("978-0-12345-678-9", new Book("Java: The Complete Reference", "Herbert Schildt", "978-0-12345-678-9"));
+
+        System.out.println("Books list:");
+        for (Book b : books.values()) {
+            System.out.println(b);
+        }
+    }
+}
diff --git a/src/main/java/lessons/lesson08/numbers/Main.java b/src/main/java/lessons/lesson08/numbers/Main.java
new file mode 100644
index 0000000..115ef5e
--- /dev/null
+++ b/src/main/java/lessons/lesson08/numbers/Main.java
@@ -0,0 +1,38 @@
+package lessons.lesson08.numbers;
+
+import java.util.*;
+
+public class Main {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        System.out.println("Input numbers by tab (example: 1 2 3 45 5)");
+        System.out.print("Numbers: ");
+        String line = sc.nextLine().trim();
+        if (line.isEmpty()) {
+            System.out.println("Exit.");
+            sc.close();
+            return;
+        }
+        String[] tokens = line.split("\\s+");
+        Set<Integer> unique = new LinkedHashSet<>();
+        for (String t : tokens) {
+            try {
+                unique.add(Integer.parseInt(t));
+            } catch (NumberFormatException ignored) {
+            }
+        }
+        if (unique.isEmpty()) {
+            System.out.println("No valid numbers found");
+        } else {
+            System.out.print("Unique numbers: ");
+            boolean first = true;
+            for (int n : unique) {
+                if (!first) System.out.print(" ");
+                System.out.print(n);
+                first = false;
+            }
+            System.out.println();
+        }
+        sc.close();
+    }
+}
diff --git a/src/main/java/lessons/lesson08/queue/ElectronicQueue.java b/src/main/java/lessons/lesson08/queue/ElectronicQueue.java
new file mode 100644
index 0000000..2336b7a
--- /dev/null
+++ b/src/main/java/lessons/lesson08/queue/ElectronicQueue.java
@@ -0,0 +1,23 @@
+package lessons.lesson08.queue;
+
+import java.util.ArrayDeque;
+import java.util.Queue;
+
+public class ElectronicQueue {
+    private Queue<User> queue = new ArrayDeque<>();
+    private int nextTicket = 1;
+
+    public User register(String name) {
+        User u = new User(name, nextTicket++);
+        queue.add(u);
+        return u;
+    }
+
+    public User processNext() {
+        return queue.poll();
+    }
+
+    public User peek() {
+        return queue.peek();
+    }
+}
diff --git a/src/main/java/lessons/lesson08/queue/QueeMain.java b/src/main/java/lessons/lesson08/queue/QueeMain.java
new file mode 100644
index 0000000..827f423
--- /dev/null
+++ b/src/main/java/lessons/lesson08/queue/QueeMain.java
@@ -0,0 +1,62 @@
+package lessons.lesson08.queue;
+
+import java.util.*;
+
+public class QueeMain {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        ElectronicQueue eq = new ElectronicQueue();
+
+        System.out.println("Commands: register \"name\" | process | peek | exit");
+
+        while (true) {
+            System.out.print("Operation: ");
+            String line = sc.nextLine();
+            if (line == null) break;
+            line = line.trim();
+            if (line.isEmpty()) continue;
+
+            // выход
+            if (line.equalsIgnoreCase("exit")) {
+                System.out.println("Exit.");
+                break;
+            }
+
+            // регистрация
+            if (line.toLowerCase().startsWith("register")) {
+                String name = "";
+                if (line.length() > 8) name = line.substring(8).trim();
+                // спрашиваем имя, если через команду не было написано
+                if (name.isEmpty()) {
+                    System.out.print("Name: ");
+                    name = sc.nextLine().trim();
+                }
+                if (name.isEmpty()) {
+                    System.out.println("Name is empty. Cancel");
+                    continue;
+                }
+                User u = eq.register(name);
+                System.out.println("Ticket " + u.ticket + " assigned to " + u.name);
+                continue;
+            }
+
+            if (line.equalsIgnoreCase("process")) {
+                User u = eq.processNext();
+                if (u == null) System.out.println("Queue is empty");
+                else System.out.println("Processing " + u);
+                continue;
+            }
+
+            if (line.equalsIgnoreCase("peek")) {
+                User u = eq.peek();
+                if (u == null) System.out.println("Queue is empty");
+                else System.out.println("Next: " + u);
+                continue;
+            }
+            // неизвестная команда
+            System.out.println("Unknown. Available: register, process, peek, exit");
+        }
+        sc.close();
+    }
+}
+
diff --git a/src/main/java/lessons/lesson08/queue/User.java b/src/main/java/lessons/lesson08/queue/User.java
new file mode 100644
index 0000000..b7570c4
--- /dev/null
+++ b/src/main/java/lessons/lesson08/queue/User.java
@@ -0,0 +1,16 @@
+package lessons.lesson08.queue;
+
+public class User {
+    String name;
+    int ticket;
+
+    User(String name, int ticket) {
+        this.name = name;
+        this.ticket = ticket;
+    }
+
+    @Override
+    public String toString() {
+        return "Ticket " + ticket + ": " + name;
+    }
+}