Finishing TODO parts

src/main/java/dev/Main.java

@@ -37,28 +37,40 @@ public class Main {
 
                     // Split data into 3 parts
 
-                    List<String> part1 = null;
+                    int size = data.size();
 
-                    List<String> part2 = null;
-
-                    List<String> part3 = null;
+                    List<String> part1 = data.subList(0, size / 3);
+                    List<String> part2 = data.subList(size / 3, 2 * size / 3);
+                    List<String> part3 = data.subList(2 * size / 3, 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:
 
                     // 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());
+
                 }
 
                 case 2 -> {

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

@@ -47,7 +47,7 @@ public class Student {
         // Example:
         // return id % 97;
 
-        return 0;
+        return id % 97;
     }
 
     @Override
@@ -58,13 +58,19 @@ public class Student {
         // Step 1:
         // Check null
 
+        if (obj == null) {
+            return false;
+        }
+
         // Step 2:
         // Convert obj to Student
 
+        Student student = (Student) obj;
+
         // Step 3:
         // Compare IDs
 
-        return false;
+        return this.id == student.id;
     }
 
     @Override

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 student : students) {
+            if (student.getId() == id) {
+                return student;
+            }
+        }
+
         return null;
     }
 
@@ -39,6 +47,13 @@ public class StudentManager {
 
         // Remove student
 
+        Student student = searchStudent(id);
+
+        if (student != null) {
+            students.remove(student);
+            return true;
+        }
+
         return false;
     }
 

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

@@ -1,7 +1,5 @@
 package dev.thread;
 
-
-
 import dev.model.Student;
 
 import java.util.ArrayList;
@@ -38,15 +36,26 @@ public class StudentLoader extends Thread {
             // TODO:
             // split line
 
+            String[] parts = line.split(",");
+
             // TODO:
             // read values
 
+            int id = Integer.parseInt(parts[0]);
+            String name = parts[1];
+            String major = parts[2];
+            double gpa = Double.parseDouble(parts[3]);
+
             // TODO:
             // create Student
 
+            Student student = new Student(id, name, major, gpa);
+
             // TODO:
             // add to students list
 
+            students.add(student);
+
         }
 
     }

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

@@ -22,6 +22,8 @@ public class FileManager {
 
             // Add line to list
 
+            lines.add(line);
+
         }
 
         reader.close();