complete code

.idea/.gitignore

@@ -0,0 +1,10 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Ignored default folder with query files
+/queries/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
+# Editor-based HTTP Client requests
+/httpRequests/

.idea/compiler.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <annotationProcessing>
+      <profile name="Maven default annotation processors profile" enabled="true">
+        <sourceOutputDir name="target/generated-sources/annotations" />
+        <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
+        <outputRelativeToContentRoot value="true" />
+        <module name="WS-07-Multithreading-Basics-and-Hashing" />
+      </profile>
+    </annotationProcessing>
+  </component>
+</project>

.idea/encodings.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
+  </component>
+</project>

.idea/jarRepositories.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RemoteRepositoriesConfiguration">
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Maven Central repository" />
+      <option name="url" value="https://repo1.maven.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="jboss.community" />
+      <option name="name" value="JBoss Community repository" />
+      <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Central Repository" />
+      <option name="url" value="https://mirror-maven.runflare.com/maven2" />
+    </remote-repository>
+  </component>
+</project>

.idea/misc.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
+      <list>
+        <option value="$PROJECT_DIR$/pom.xml" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" project-jdk-name="25" project-jdk-type="JavaSDK" />
+</project>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

src/main/java/dev/Main.java

@@ -33,31 +33,37 @@ public class Main {
 
                     List<String> data = FileManager.loadStudents("students.txt");
 
-                    // TODO:
+                    int size = data.size();
 
-                    // Split data into 3 parts
+                    int partSize = size / 3;
 
-                    List<String> part1 = null;
+                    List<String> part1 = data.subList(0, partSize);
 
-                    List<String> part2 = null;
+                    List<String> part2 = data.subList(partSize, 2 * partSize);
 
-                    List<String> part3 = null;
+                    List<String> part3 = data.subList(2 * partSize, size);
 
-                    // TODO:
 
-                    StudentLoader t1 = null;
 
-                    StudentLoader t2 = null;
+                    StudentLoader t1 = new StudentLoader(part1);
 
-                    StudentLoader t3 = null;
+                    StudentLoader t2 = new StudentLoader(part2);
 
-                    // TODO:
+                    StudentLoader t3 = new StudentLoader(part3);
 
-                    // start()
+                    t1.start();
+                    t2.start();
+                    t3.start();
 
-                    // join()
+                    t1.join();
+                    t2.join();
+                    t3.join();
 
-                    // merge results
+                    manager.addStudents(t1.getStudents());
+                    manager.addStudents(t2.getStudents());
+                    manager.addStudents(t3.getStudents());
+
+                    System.out.println("Data loaded successfully.");
 
                 }
 

src/main/java/dev/model/Student.java

@@ -41,30 +41,17 @@ public class Student {
     @Override
     public int hashCode() {
 
-        // TODO:
-        // Return custom hash
-
-        // Example:
-        // return id % 97;
-
-        return 0;
+        return id % 97;
     }
 
     @Override
     public boolean equals(Object obj) {
 
-        // TODO:
+        if (this == obj) return true;
+        if (obj == null || getClass() != obj.getClass()) return false;
 
-        // Step 1:
-        // Check null
-
-        // Step 2:
-        // Convert obj to Student
-
-        // Step 3:
-        // Compare IDs
-
-        return false;
+        Student student = (Student)obj;
+        return  id == student.id;
     }
 
     @Override

src/main/java/dev/service/StudentManager.java

@@ -11,35 +11,24 @@ public class StudentManager {
 
     public void addStudents(ArrayList<Student> newStudents) {
 
-        // TODO:
-
-        // Merge students
-
-        // Hint:
-        // addAll()
+        if(newStudents != null){
+            this.students.addAll(newStudents);
+        }
 
     }
 
     public Student searchStudent(int id) {
 
-        // TODO:
-
-        // Loop through students
-
-        // Compare IDs
+        for(Student s : students) {
+            if(s.getId() == id ) return s;
+        }
 
         return null;
     }
 
     public boolean removeStudent(int id) {
 
-        // TODO:
-
-        // Find student
-
-        // Remove student
-
-        return false;
+       return students.removeIf(s -> s.getId() == id);
     }
 
     public void printStudents() {

src/main/java/dev/thread/StudentLoader.java

@@ -25,28 +25,26 @@ public class StudentLoader extends Thread {
     @Override
     public void run() {
 
-        // TODO:
-
-        /*
-        Example line:
-
-        1001,Aryan,Computer Science,3.7
-         */
-
         for(String line : lines){
 
-            // TODO:
-            // split line
+            if( line == null || line.isBlank()) continue;
 
-            // TODO:
-            // read values
+            try {
 
-            // TODO:
-            // create Student
+                String[] parts = line.split(",");
 
-            // TODO:
-            // add to students list
 
+                int id = Integer.parseInt(parts[0].trim());
+                String name = parts[1].trim();
+                String major = parts[2].trim();
+                double gpa = Double.parseDouble(parts[3].trim());
+
+
+                students.add(new Student(id, name, major, gpa));
+
+            } catch (Exception e) {
+                System.err.println("Error parsing line: " + line);
+            }
         }
 
     }

src/main/java/dev/utils/FileManager.java

@@ -18,10 +18,7 @@ public class FileManager {
 
         while ((line = reader.readLine()) != null) {
 
-            // TODO:
-
-            // Add line to list
-
+            lines.add(line);
         }
 
         reader.close();

src/main/java/lecture/multithreading/timeout/Main.java

@@ -1,10 +1,24 @@
 package lecture.multithreading.timeout;
 
 
+import java.util.Scanner;
 
 public class Main {
     public static void main(String[] args) {
-        // TODO
+        Scanner scanner = new Scanner(System.in);
+        System.out.println("You have 10 second: ");
+        System.out.println("Enter your name: ");
+
+        MyRunnable myRunnable = new MyRunnable();
+        Thread thread = new Thread(myRunnable);
+        thread.setDaemon(true);
+        thread.start();
+
+        String name = scanner.nextLine();
+        System.out.println("Hello " + name);
+
+
+        scanner.close();
     }
 }
 

src/main/java/lecture/multithreading/timeout/MyRunnable.java

@@ -0,0 +1,19 @@
+package lecture.multithreading.timeout;
+
+public class MyRunnable implements Runnable{
+    @Override
+    public void run() {
+        for(int i = 1 ; i <= 10 ; i++){
+            try {
+                Thread.sleep(1000);
+            } catch (InterruptedException e) {
+                System.out.println("thread was interrupted");
+            }
+
+            if(i == 10) {
+                System.out.println("time is up. ");
+                System.exit(0);
+            }
+        }
+    }
+}