From d9bc9d8eb9b05065d3d2e58317691a8d238f680b Mon Sep 17 00:00:00 2001
From: Mahdi <mahdi.goudarzi.sbu.cs@gmail.com>
Date: Wed, 27 May 2026 21:01:44 -0700
Subject: [PATCH] done

---
 src/main/java/dev/Main.java                   | 38 ++++++++++++-------
 src/main/java/dev/model/Student.java          | 25 ++++++------
 src/main/java/dev/service/StudentManager.java | 32 +++++++++-------
 src/main/java/dev/thread/StudentLoader.java   | 20 ++--------
 src/main/java/dev/utils/FileManager.java      |  4 +-
 5 files changed, 59 insertions(+), 60 deletions(-)

diff --git a/src/main/java/dev/Main.java b/src/main/java/dev/Main.java
index 19ca657..01163d0 100644
--- a/src/main/java/dev/Main.java
+++ b/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;
 
@@ -16,6 +17,7 @@ public class Main {
         StudentManager manager = new StudentManager();
 
         while (true) {
+            System.out.println("==================================");
 
             System.out.println("""
                     1.Load students
@@ -23,41 +25,50 @@ public class Main {
                     3.Remove student
                     4.Print students
                     5.Exit
+                    Chose:
                     """);
 
+
+
             int choice = scanner.nextInt();
 
+
             switch (choice) {
 
                 case 1 -> {
 
                     List<String> data = FileManager.loadStudents("students.txt");
 
-                    // TODO:
+                    int n = data.size();
 
-                    // Split data into 3 parts
+                    List<String> part1 = data.subList(0 , n/3 );
 
-                    List<String> part1 = null;
+                    List<String> part2 = data.subList(n/3 , (2*n)/3);
 
-                    List<String> part2 = null;
+                    List<String> part3 = data.subList((2*n)/3 , n);
 
-                    List<String> part3 = null;
 
-                    // 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:
+                    t1.start();
+                    t2.start();
+                    t3.start();
 
-                    // start()
+                    t1.join();
+                    t2.join();
+                    t3.join();
 
-                    // join()
+                    manager.addStudents(t1.getStudents());
+                    manager.addStudents(t2.getStudents());
+                    manager.addStudents(t3.getStudents());
+
+                    System.out.println("Loading Done");
 
-                    // merge results
 
                 }
 
@@ -87,6 +98,7 @@ public class Main {
                         manager.printStudents();
 
                 case 5 -> {
+                    System.out.println("Good by");
                     return;
                 }
 
diff --git a/src/main/java/dev/model/Student.java b/src/main/java/dev/model/Student.java
index f0484f4..1f649a8 100644
--- a/src/main/java/dev/model/Student.java
+++ b/src/main/java/dev/model/Student.java
@@ -41,30 +41,27 @@ public class Student {
     @Override
     public int hashCode() {
 
-        // TODO:
-        // Return custom hash
+        return id % 97;
 
-        // Example:
-        // return id % 97;
-
-        return 0;
     }
 
     @Override
     public boolean equals(Object obj) {
 
-        // TODO:
+        if(obj == null){
+            return false;
+        }
 
-        // Step 1:
-        // Check null
+        Student std = (Student) obj;
 
-        // Step 2:
-        // Convert obj to Student
+        if(std.hashCode() == this.hashCode()){
+            return true;
+        }
+        else {
+            return false;
+        }
 
-        // Step 3:
-        // Compare IDs
 
-        return false;
     }
 
     @Override
diff --git a/src/main/java/dev/service/StudentManager.java b/src/main/java/dev/service/StudentManager.java
index 403a1c6..5a7d78c 100644
--- a/src/main/java/dev/service/StudentManager.java
+++ b/src/main/java/dev/service/StudentManager.java
@@ -1,6 +1,7 @@
 package dev.service;
 
 import dev.model.Student;
+import dev.utils.FileManager;
 
 import java.util.ArrayList;
 
@@ -11,35 +12,38 @@ public class StudentManager {
 
     public void addStudents(ArrayList<Student> newStudents) {
 
-        // TODO:
-
-        // Merge students
-
-        // Hint:
-        // addAll()
+        this.students.addAll(newStudents);
 
     }
 
     public Student searchStudent(int id) {
 
-        // TODO:
-
-        // Loop through students
-
-        // Compare IDs
+        for(Student st : students){
+            if(st.getId() == id){
+                return st;
+            }
+        }
 
         return null;
     }
 
     public boolean removeStudent(int id) {
 
-        // TODO:
+        Student removeable = null;
 
-        // Find student
+        for(Student st: students){
+            if(st.getId() == id){
+                removeable = st;
+            }
+        }
 
-        // Remove student
+        if(removeable!= null){
+            students.remove(removeable);
+            return true;
+        }
 
         return false;
+
     }
 
     public void printStudents() {
diff --git a/src/main/java/dev/thread/StudentLoader.java b/src/main/java/dev/thread/StudentLoader.java
index ab47522..331a903 100644
--- a/src/main/java/dev/thread/StudentLoader.java
+++ b/src/main/java/dev/thread/StudentLoader.java
@@ -25,27 +25,15 @@ 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
+            String[] data = line.split(",");
 
-            // TODO:
-            // read values
+            Student mystd = new Student(Integer.parseInt(data[0]) , data[1] ,
+                    data[2] , Double.parseDouble(data[3]));
 
-            // TODO:
-            // create Student
+            students.add(mystd);
 
-            // TODO:
-            // add to students list
 
         }
 
diff --git a/src/main/java/dev/utils/FileManager.java b/src/main/java/dev/utils/FileManager.java
index da7f6f5..ab55c75 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);
 
         }