complete all parts

src/main/java/dev/Main.java

@@ -1,5 +1,6 @@
 package dev;
 
+import dev.model.Student;
 import dev.service.StudentManager;
 import dev.thread.StudentLoader;
 import dev.utils.FileManager;
@@ -33,32 +34,30 @@ public class Main {
 
                     List<String> data = FileManager.loadStudents("students.txt");
 
-                    // TODO:
+                    List<String> part1 = data.subList(0, 20);
 
-                    // Split data into 3 parts
+                    List<String> part2 = data.subList(20, 40);
 
-                    List<String> part1 = null;
+                    List<String> part3 = data.subList(40, 60);
 
-                    List<String> part2 = null;
 
-                    List<String> part3 = null;
+                    StudentLoader t1 = new StudentLoader(part1);
 
-                    // TODO:
+                    StudentLoader t2 = new StudentLoader(part2);
 
-                    StudentLoader t1 = null;
+                    StudentLoader t3 = new StudentLoader(part3);
 
-                    StudentLoader t2 = null;
+                    t1.start();
+                    t2.start();
+                    t3.start();
 
-                    StudentLoader t3 = null;
-
-                    // TODO:
-
-                    // start()
-
-                    // join()
-
-                    // merge results
+                    t1.join();
+                    t2.join();
+                    t3.join();
 
+                    manager.addStudents(t1.getStudents());
+                    manager.addStudents(t2.getStudents());
+                    manager.addStudents(t3.getStudents());
                 }
 
                 case 2 -> {
@@ -67,7 +66,8 @@ public class Main {
 
                     int id = scanner.nextInt();
 
-                    System.out.println(manager.searchStudent(id));
+                    Student s = manager.searchStudent(id);
+                    System.out.println(s != null ? s : "Not found");
 
                 }
 

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

@@ -40,31 +40,16 @@ public class Student {
 
     @Override
     public int hashCode() {
-
-        // TODO:
-        // Return custom hash
-
-        // Example:
-        // return id % 97;
-
-        return 0;
+        return this.id % 97;
     }
 
     @Override
     public boolean equals(Object obj) {
 
-        // TODO:
+        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 s = (Student) obj;
+        return s.id == this.id;
     }
 
     @Override

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

@@ -11,33 +11,31 @@ public class StudentManager {
 
     public void addStudents(ArrayList<Student> newStudents) {
 
-        // TODO:
-
-        // Merge students
-
-        // Hint:
-        // addAll()
-
+        students.addAll(newStudents);
     }
 
     public Student searchStudent(int id) {
 
-        // TODO:
-
-        // Loop through students
-
-        // Compare IDs
-
+        for (Student s : students)
+        {
+            if (id == s.getId())
+            {
+                return s;
+            }
+        }
         return null;
     }
 
     public boolean removeStudent(int id) {
 
-        // TODO:
-
-        // Find student
-
-        // Remove student
+        for (Student s : students)
+        {
+            if (id == s.getId())
+            {
+                students.remove(s);
+                return true;
+            }
+        }
 
         return false;
     }

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

@@ -25,30 +25,17 @@ 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
-
-            // TODO:
-            // read values
-
-            // TODO:
-            // create Student
-
-            // TODO:
-            // add to students list
+            String[] parts = line.split(",");
+            int id = Integer.parseInt(parts[0]);
+            String name = parts[1];
+            String major = parts[2];
+            double gpa = Double.parseDouble(parts[3]);
 
+            Student student = new Student(id, name, major, gpa);
+            students.add(student);
         }
-
     }
 
     public ArrayList<Student> getStudents() {

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

@@ -18,9 +18,7 @@ public class FileManager {
 
         while ((line = reader.readLine()) != null) {
 
-            // TODO:
-
-            // Add line to list
+            lines.add(line);
 
         }