Check and debug completed.

.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://maven.myket.ir" />
+    </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

@@ -4,6 +4,7 @@ import dev.service.StudentManager;
 import dev.thread.StudentLoader;
 import dev.utils.FileManager;
 
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Scanner;
 
@@ -33,32 +34,37 @@ public class Main {
 
                     List<String> data = FileManager.loadStudents("students.txt");
 
-                    // TODO:
+                    ArrayList<String> part1 = new ArrayList<>();
+                    ArrayList<String> part2 = new ArrayList<>();
+                    ArrayList<String> part3 = new ArrayList<>();
 
-                    // Split data into 3 parts
+                    for(int i=0; i<data.size(); i++) {
+                        if (i%3 == 0) {
+                            part1.add(data.get(i));
+                        } else if (i%3 == 1) {
+                            part2.add(data.get(i));
+                        } else {
+                            part3.add(data.get(i));
+                        }
+                    }
 
-                    List<String> part1 = null;
+                    StudentLoader t1 = new StudentLoader(part1);
+                    StudentLoader t2 = new StudentLoader(part2);
+                    StudentLoader t3 = new StudentLoader(part3);
 
-                    List<String> part2 = null;
+                    t1.start();
+                    t2.start();
+                    t3.start();
 
-                    List<String> part3 = null;
+                    t1.join();
+                    t2.join();
+                    t3.join();
 
-                    // TODO:
-
-                    StudentLoader t1 = null;
-
-                    StudentLoader t2 = null;
-
-                    StudentLoader t3 = null;
-
-                    // TODO:
-
-                    // start()
-
-                    // join()
-
-                    // merge results
+                    manager.addStudents(t1.getStudents());
+                    manager.addStudents(t2.getStudents());
+                    manager.addStudents(t3.getStudents());
 
+                    System.out.println("Students loaded successfully.");
                 }
 
                 case 2 -> {

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

@@ -40,31 +40,20 @@ public class Student {
 
     @Override
     public int hashCode() {
-
-        // TODO:
-        // Return custom hash
-
-        // Example:
-        // return id % 97;
-
-        return 0;
+        return this.getId() % 97;
     }
 
     @Override
     public boolean equals(Object obj) {
+        if (obj == null) return false;
 
-        // TODO:
+        if (this == obj) return true;
 
-        // Step 1:
-        // Check null
+        if (this.getClass() != obj.getClass()) return false;
 
-        // Step 2:
-        // Convert obj to Student
+        Student other = (Student) obj;
 
-        // Step 3:
-        // Compare IDs
-
-        return false;
+        return this.id == other.id;
     }
 
     @Override

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

@@ -10,34 +10,28 @@ public class StudentManager {
     private final ArrayList<Student> students = new ArrayList<>();
 
     public void addStudents(ArrayList<Student> newStudents) {
-
-        // TODO:
-
-        // Merge students
-
-        // Hint:
-        // addAll()
-
+        if (newStudents != null && !newStudents.isEmpty()) {
+            students.addAll(newStudents);
+        }
     }
 
     public Student searchStudent(int id) {
-
-        // TODO:
-
-        // Loop through students
-
-        // Compare IDs
+        for (Student student: students) {
+            if (student.getId() == id) {
+                return student;
+            }
+        }
 
         return null;
     }
 
     public boolean removeStudent(int id) {
+        Student s = searchStudent(id);
 
-        // TODO:
-
-        // Find student
-
-        // Remove student
+        if (s != null) {
+            students.remove(s);
+            return true;
+        }
 
         return false;
     }

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

@@ -24,35 +24,27 @@ public class StudentLoader extends Thread {
 
     @Override
     public void run() {
-
-        // TODO:
-
-        /*
-        Example line:
-
-        1001,Aryan,Computer Science,3.7
-         */
-
         for (String line : lines) {
+            try {
+                String[] parts = line.split(",");
 
-            // TODO:
-            // split line
+                if(parts.length == 4) {
+                    int id = Integer.parseInt(parts[0].trim());
+                    String name = parts[1].trim();
+                    String major = parts[2].trim();
+                    double gpa = Double.parseDouble(parts[3].trim());
 
-            // TODO:
-            // read values
-
-            // TODO:
-            // create Student
-
-            // TODO:
-            // add to students list
+                    Student student = new Student(id,name,major,gpa);
 
+                    students.add(student);
+                }
+            } catch (Exception e) {
+                System.out.println(e.getMessage());
+            }
         }
-
     }
 
     public ArrayList<Student> getStudents() {
-
         return students;
     }
 

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

@@ -17,11 +17,9 @@ public class FileManager {
         String line;
 
         while ((line = reader.readLine()) != null) {
-
-            // TODO:
-
-            // Add line to list
-
+            if (!line.trim().isEmpty()) {
+                lines.add(line);
+            }
         }
 
         reader.close();