From f09b91d8c2b10244297d69debb2764090daa523d Mon Sep 17 00:00:00 2001
From: mohammadreza <mohammadrezaashrafian2@gmail.com>
Date: Thu, 4 Jun 2026 19:01:55 +0330
Subject: [PATCH] implement all TODO tasks

---
 src/main/java/dev/Main.java                   | 24 ++++++++++++++-----
 src/main/java/dev/model/Student.java          |  9 +++++--
 src/main/java/dev/service/StudentManager.java | 17 +++++++++++++
 src/main/java/dev/thread/StudentLoader.java   | 10 ++++++++
 src/main/java/dev/utils/FileManager.java      |  4 +---
 5 files changed, 53 insertions(+), 11 deletions(-)

diff --git a/src/main/java/dev/Main.java b/src/main/java/dev/Main.java
index 19ca657..d82cf9b 100644
--- a/src/main/java/dev/Main.java
+++ b/src/main/java/dev/Main.java
@@ -37,19 +37,19 @@ public class Main {
 
                     // Split data into 3 parts
 
-                    List<String> part1 = null;
+                    List<String> part1 = data.subList(0, data.size()*35/100);
 
-                    List<String> part2 = null;
+                    List<String> part2 = data.subList(data.size()*35/100, data.size()*7/10);
 
-                    List<String> part3 = null;
+                    List<String> part3 = data.subList(data.size()*7/10, data.size());
 
                     // TODO:
 
-                    StudentLoader t1 = null;
+                    StudentLoader t1 = new StudentLoader(part1);
 
-                    StudentLoader t2 = null;
+                    StudentLoader t2 = new StudentLoader(part2);
 
-                    StudentLoader t3 = null;
+                    StudentLoader t3 = new StudentLoader(part3);
 
                     // TODO:
 
@@ -57,8 +57,20 @@ public class Main {
 
                     // join()
 
+                    t1.start();
+                    t2.start();
+                    t3.start();
+
+                    t1.join();
+                    t2.join();
+                    t3.join();
+
                     // merge results
 
+                    manager.addStudents(t1.getStudents());
+                    manager.addStudents(t2.getStudents());
+                    manager.addStudents(t3.getStudents());
+
                 }
 
                 case 2 -> {
diff --git a/src/main/java/dev/model/Student.java b/src/main/java/dev/model/Student.java
index f0484f4..e33b3cf 100644
--- a/src/main/java/dev/model/Student.java
+++ b/src/main/java/dev/model/Student.java
@@ -47,7 +47,7 @@ public class Student {
         // Example:
         // return id % 97;
 
-        return 0;
+        return id % 97;
     }
 
     @Override
@@ -64,7 +64,12 @@ public class Student {
         // Step 3:
         // Compare IDs
 
-        return false;
+        if (obj == null)
+            return false;
+
+        Student st = (Student) obj;
+
+        return this.getId() == st.getId();
     }
 
     @Override
diff --git a/src/main/java/dev/service/StudentManager.java b/src/main/java/dev/service/StudentManager.java
index 403a1c6..f82575f 100644
--- a/src/main/java/dev/service/StudentManager.java
+++ b/src/main/java/dev/service/StudentManager.java
@@ -18,6 +18,8 @@ public class StudentManager {
         // Hint:
         // addAll()
 
+        students.addAll(newStudents);
+
     }
 
     public Student searchStudent(int id) {
@@ -28,6 +30,12 @@ public class StudentManager {
 
         // Compare IDs
 
+        for (Student st : students) {
+
+            if (st.getId() == id)
+                return st;
+        }
+
         return null;
     }
 
@@ -39,6 +47,15 @@ public class StudentManager {
 
         // Remove student
 
+        for (Student st : students) {
+
+            if (st.getId() == id) {
+                students.remove(st);
+                return true;
+            }
+
+        }
+
         return false;
     }
 
diff --git a/src/main/java/dev/thread/StudentLoader.java b/src/main/java/dev/thread/StudentLoader.java
index ab47522..d414259 100644
--- a/src/main/java/dev/thread/StudentLoader.java
+++ b/src/main/java/dev/thread/StudentLoader.java
@@ -38,15 +38,25 @@ public class StudentLoader extends Thread {
             // TODO:
             // split line
 
+            List<String> parts = List.of(line.split(","));
+
             // TODO:
             // read values
 
+            int id = Integer.parseInt(parts.get(0));
+            String name = parts.get(1);
+            String major = parts.get(2);
+            double gpa = Double.parseDouble(parts.get(3));
+
             // TODO:
             // create Student
 
+            Student currentStudent = new Student(id, name, major, gpa);
+
             // TODO:
             // add to students list
 
+            students.add(currentStudent);
         }
 
     }
diff --git a/src/main/java/dev/utils/FileManager.java b/src/main/java/dev/utils/FileManager.java
index da7f6f5..075879c 100644
--- a/src/main/java/dev/utils/FileManager.java
+++ b/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);
 
         }