.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="Central Repository" />
+      <option name="url" value="https://maven.devneeds.ir/" />
+    </remote-repository>
+    <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>
+  </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

@@ -36,29 +36,37 @@ public class Main {
                     // TODO:
 
                     // Split data into 3 parts
+                    int size = data.size();
+                    int partSize = (int) Math.ceil(size / 3.0);
 
-                    List<String> part1 = null;
-
-                    List<String> part2 = null;
-
-                    List<String> part3 = null;
+                    List<String> part1 = data.subList(0, Math.min(partSize, size));
+                    List<String> part2 = data.subList(Math.min(partSize, size), Math.min(partSize * 2, size));
+                    List<String> part3 = data.subList(Math.min(partSize * 2, size), size);
 
                     // TODO:
 
-                    StudentLoader t1 = null;
-
-                    StudentLoader t2 = null;
-
-                    StudentLoader t3 = null;
+                    StudentLoader t1 = new StudentLoader(part1);
+                    StudentLoader t2 = new StudentLoader(part2);
+                    StudentLoader t3 = new StudentLoader(part3);
 
                     // TODO:
 
                     // 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("Students loaded successfully.");
                 }
 
                 case 2 -> {

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

@@ -45,9 +45,7 @@ public class Student {
         // Return custom hash
 
         // Example:
-        // return id % 97;
-
-        return 0;
+        return id % 97;
     }
 
     @Override
@@ -57,14 +55,17 @@ public class Student {
 
         // Step 1:
         // Check null
+        if (obj == null || 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

@@ -14,9 +14,9 @@ public class StudentManager {
         // TODO:
 
         // Merge students
-
-        // Hint:
-        // addAll()
+        if (newStudents != null){
+            this.students.addAll(newStudents);
+        }
 
     }
 
@@ -27,7 +27,11 @@ public class StudentManager {
         // Loop through students
 
         // Compare IDs
-
+        for (Student student : students){
+            if (student.getId() == id){
+                return student;
+            }
+        }
         return null;
     }
 
@@ -38,11 +42,19 @@ public class StudentManager {
         // Find student
 
         // Remove student
-
+        for (int i = 0; i < students.size(); i++){
+            if (students.get(i).getId() == id){
+                students.remove(i);
+                return true;
+            }
+        }
         return false;
     }
 
     public void printStudents() {
+        if (students.isEmpty()){
+            System.out.println("No students found.");
+        }
 
         for (Student student : students) {
 

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

@@ -26,7 +26,6 @@ public class StudentLoader extends Thread {
     public void run() {
 
         // TODO:
-
         /*
         Example line:
 
@@ -37,17 +36,33 @@ public class StudentLoader extends Thread {
 
             // TODO:
             // split line
+            String[] parts = line.split(",");
 
             // TODO:
             // read values
+            if (parts.length == 4){
+                try {
+                    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:
-            // create Student
+                    // TODO:
+                    // create Student
+                    Student student = new Student(id, name, major, gpa);
 
-            // TODO:
-            // add to students list
+                    // TODO:
+                    // add to students list
+                    students.add(student);
+                }
+                catch (NumberFormatException e){
+                    System.err.println("Skipping invalid line format: " + line);
+                }
+            }
 
         }
+        // to check if threads are working
+        // System.out.println(Thread.currentThread().getName() + " -> " + lines.size());
 
     }
 

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

@@ -21,6 +21,7 @@ public class FileManager {
             // TODO:
 
             // Add line to list
+            lines.add(line);
 
         }