multihreading

src/main/java/dev/Main.java

@@ -1,22 +1,34 @@
 package dev;
 
+
+import dev.model.Student;
 import dev.service.StudentManager;
 import dev.thread.StudentLoader;
 import dev.utils.FileManager;
 
+
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Scanner;
 
+
 public class Main {
 
+
     public static void main(String[] args) throws Exception {
 
+
         Scanner scanner = new Scanner(System.in);
 
-        StudentManager manager = new StudentManager();
+
+        StudentManager manager =
+                new StudentManager();
+
+
 
         while (true) {
 
+
             System.out.println("""
                     1.Load students
                     2.Search student
@@ -25,71 +37,180 @@ public class Main {
                     5.Exit
                     """);
 
+
+
             int choice = scanner.nextInt();
 
+
+
             switch (choice) {
 
+
+
                 case 1 -> {
 
-                    List<String> data = FileManager.loadStudents("students.txt");
 
-                    // TODO:
+                    List<String> data =
+                            FileManager.loadStudents("students.txt");
 
-                    // Split data into 3 parts
 
-                    List<String> part1 = null;
 
-                    List<String> part2 = null;
+                    int size = data.size();
 
-                    List<String> part3 = null;
 
-                    // TODO:
+                    int part = (int)Math.ceil(size / 3.0);
 
-                    StudentLoader t1 = null;
 
-                    StudentLoader t2 = null;
 
-                    StudentLoader t3 = null;
+                    List<String> part1 =
+                            data.subList(
+                                    0,
+                                    Math.min(part,size)
+                            );
 
-                    // TODO:
 
-                    // start()
+                    List<String> part2 =
+                            data.subList(
+                                    Math.min(part,size),
+                                    Math.min(part*2,size)
+                            );
 
-                    // join()
 
-                    // merge results
+                    List<String> part3 =
+                            data.subList(
+                                    Math.min(part*2,size),
+                                    size
+                            );
+
+
+
+                    StudentLoader t1 =
+                            new StudentLoader(part1);
+
+
+                    StudentLoader t2 =
+                            new StudentLoader(part2);
+
+
+                    StudentLoader t3 =
+                            new StudentLoader(part3);
+
+
+
+                    t1.start();
+
+                    t2.start();
+
+                    t3.start();
+
+
+
+                    t1.join();
+
+                    t2.join();
+
+                    t3.join();
+
+
+
+
+                    ArrayList<Student> finalList =
+                            new ArrayList<>();
+
+
+                    finalList.addAll(t1.getStudents());
+
+                    finalList.addAll(t2.getStudents());
+
+                    finalList.addAll(t3.getStudents());
+
+
+
+                    manager.addStudents(finalList);
+
+
+
+                    System.out.println(
+                            "Students loaded: "
+                                    + finalList.size()
+                    );
+
 
                 }
 
+
+
                 case 2 -> {
 
+
                     System.out.print("ID: ");
 
+
                     int id = scanner.nextInt();
 
-                    System.out.println(manager.searchStudent(id));
+
+
+                    Student student =
+                            manager.searchStudent(id);
+
+
+
+                    if(student != null){
+
+                        System.out.println("Found:");
+
+                        System.out.println(student);
+
+                    }
+
+                    else{
+
+                        System.out.println("Student not found.");
+
+                    }
+
 
                 }
 
+
+
                 case 3 -> {
 
+
                     System.out.print("ID: ");
 
+
                     int id = scanner.nextInt();
 
-                    boolean removed = manager.removeStudent(id);
 
-                    System.out.println(removed);
+                    System.out.println(
+                            manager.removeStudent(id)
+                    );
+
 
                 }
 
-                case 4 ->
-                        manager.printStudents();
+
+
+                case 4 -> {
+
+
+                    manager.printStudents();
+
+
+                }
+
+
 
                 case 5 -> {
+
+
                     return;
+
+
                 }
 
+
             }
 
         }