feat: Complete timeout example for threading

src/main/java/dev/Main.java

@@ -1,11 +1,9 @@
 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;
 
@@ -33,36 +31,34 @@ public class Main {
 
                 case 1 -> {
 
-                    List<String> data = FileManager.loadStudents("students.csv");
+                    List<String> data = FileManager.loadStudents("students.txt");
 
-                    // Split the file into three parts
-                    List<String> part1 = data.subList(0,(data.size()/3 - 1));
+                    // TODO:
 
-                    List<String> part2 = data.subList((data.size()/3 - 1), (2 * data.size()/3 - 1));
+                    // Split data into 3 parts
 
-                    List<String> part3 = data.subList(((2 * data.size()/3 - 1)), data.size());
+                    List<String> part1 = null;
 
-                    // Create a thread for each part
-                    StudentLoader t1 = new StudentLoader(part1);
+                    List<String> part2 = null;
 
-                    StudentLoader t2 = new StudentLoader(part2);
+                    List<String> part3 = null;
 
-                    StudentLoader t3 = new StudentLoader(part3);
+                    // TODO:
 
-                    // Starting all three threads
-                    t1.start();
-                    t2.start();
-                    t3.start();
+                    StudentLoader t1 = null;
 
-                    // Waiting for all threads to finish
-                    t1.join();
-                    t2.join();
-                    t3.join();
+                    StudentLoader t2 = null;
+
+                    StudentLoader t3 = null;
+
+                    // TODO:
+
+                    // start()
+
+                    // join()
+
+                    // merge results
 
-                    // Merging all lists
-                    manager.addStudents(t1.getStudents());
-                    manager.addStudents(t2.getStudents());
-                    manager.addStudents(t3.getStudents());
                 }
 
                 case 2 -> {
@@ -70,12 +66,8 @@ public class Main {
                     System.out.print("ID: ");
 
                     int id = scanner.nextInt();
-                    try {
-                        System.out.println(manager.searchStudent(id).toString());
-                    }
-                    catch (NullPointerException e){
-                        System.err.println(e.getMessage());
-                    }
+
+                    System.out.println(manager.searchStudent(id));
 
                 }
 

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

@@ -40,14 +40,31 @@ public class Student {
 
     @Override
     public int hashCode() {
-        return id % 97;
+
+        // TODO:
+        // Return custom hash
+
+        // Example:
+        // return id % 97;
+
+        return 0;
     }
 
     @Override
     public boolean equals(Object obj) {
-        if (obj == null) { return false; }
-        Student _obj = (Student) obj;
-        return _obj.getId() == this.getId();
+
+        // TODO:
+
+        // Step 1:
+        // Check null
+
+        // Step 2:
+        // Convert obj to Student
+
+        // Step 3:
+        // Compare IDs
+
+        return false;
     }
 
     @Override

src/main/java/dev/service/StudentManager.java

@@ -10,27 +10,34 @@ public class StudentManager {
     private final ArrayList<Student> students = new ArrayList<>();
 
     public void addStudents(ArrayList<Student> newStudents) {
-        students.addAll(newStudents);
+
+        // TODO:
+
+        // Merge students
+
+        // Hint:
+        // addAll()
+
     }
 
     public Student searchStudent(int id) {
-        for (Student student : students){
-            if (student.getId() == id){
-                return student;
-            }
-        }
+
+        // TODO:
+
+        // Loop through students
+
+        // Compare IDs
 
         return null;
     }
 
     public boolean removeStudent(int id) {
 
-        Student student = searchStudent(id);
+        // TODO:
 
-        if (student != null){
-            students.remove(student);
-            return true;
-        }
+        // Find student
+
+        // Remove student
 
         return false;
     }

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

@@ -18,30 +18,41 @@ public class StudentLoader extends Thread {
     private final ArrayList<Student> students = new ArrayList<>();
 
     public StudentLoader(List<String> lines) {
+
         this.lines = lines;
     }
 
-    // Loads the database from the lines and assign its values to students array and return it
     @Override
     public void run() {
+
+        // TODO:
+
+        /*
+        Example line:
+
+        1001,Aryan,Computer Science,3.7
+         */
+
         for (String line : lines) {
-            String[] values = line.split(",");
 
-            int id = Integer.parseInt(values[0]);
-            String name = values[1];
-            String major = values[2];
-            double gpa = Double.parseDouble(values[3]);
+            // TODO:
+            // split line
+
+            // TODO:
+            // read values
+
+            // TODO:
+            // create Student
+
+            // TODO:
+            // add to students list
 
-            students.add(new Student(
-                    id,
-                    name,
-                    major,
-                    gpa
-            ));
         }
+
     }
 
     public ArrayList<Student> getStudents() {
+
         return students;
     }
 

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

@@ -17,10 +17,15 @@ public class FileManager {
         String line;
 
         while ((line = reader.readLine()) != null) {
-            lines.add(line);
+
+            // TODO:
+
+            // Add line to list
+
         }
 
         reader.close();
+
         return lines;
     }
 

src/main/java/lecture/multithreading/timeout/Main.java

@@ -6,36 +6,20 @@ import java.util.Scanner;
 public class Main {
     public static void main(String[] args) {
 
-        Thread th;
-        Thread th2;
+        Scanner scanner = new Scanner(System.in);
 
-        th2 = new Thread(new Runnable() {
-            @Override
-            public void run() {
-                Scanner scanner = new Scanner(System.in);
+        System.out.println("you have 10 seconds: ");
+        System.out.print("enter your name: ");
 
-                String name;
-                name = scanner.nextLine();
-                System.out.println("Hello "+ name);
-                System.exit(0);
-            }
-        });
-        th = new Thread(new Runnable(){
-            @Override
-            public void run() {
-                try {
-                    Thread.sleep(10000);
-                } catch (InterruptedException e) {
-                    throw new RuntimeException(e);
-                }
-                System.out.println("timeout!");
-                System.exit(0);
-            }
-        });
+        MyRunnable myRunnable = new MyRunnable();
+        Thread thread = new Thread(myRunnable);
+        thread.setDaemon(true);
+        thread.start();
 
-        th.start();
-        th2.start();
+        String name = scanner.nextLine();
+        System.out.println("hello " + name);
 
+        scanner.close();
     }
 }
 

src/main/java/lecture/multithreading/timeout/MyRunnable.java

@@ -0,0 +1,22 @@
+package lecture.multithreading.timeout;
+
+public class MyRunnable implements Runnable{
+
+    @Override
+    public void run(){
+
+        for (int i = 1; i <= 10 ; i++){
+            try {
+                Thread.sleep(1000);
+            } catch (InterruptedException e) {
+                System.out.println("thread was interrupted");
+            }
+
+            if(i == 10){
+                System.out.println("time is up");
+                System.exit(0);
+            }
+
+        }
+    }
+}