complete workshop

src/main/java/dev/Main.java

@@ -37,20 +37,17 @@ public class Main {
 
                     // Split data into 3 parts
 
-                    List<String> part1 = null;
-
-                    List<String> part2 = null;
-
-                    List<String> part3 = null;
+                    int size = data.size();
+                    int third = size / 3;
 
+                    List<String> part1 = data.subList(0, third);
+                    List<String> part2 = data.subList(third, third * 2);
+                    List<String> part3 = data.subList(third * 2, 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()
@@ -58,7 +55,17 @@ public class Main {
                     // join()
 
                     // merge results
+                    t1.start();
+                    t2.start();
+                    t3.start();
 
+                    t1.join();
+                    t2.join();
+                    t3.join();
+
+                    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
@@ -57,14 +57,21 @@ public class Student {
 
         // Step 1:
         // Check null
+        if (obj == null) {
+            return false;
+        }
 
         // Step 2:
         // Convert obj to Student
+        if (!(obj instanceof Student)) {
+            return false;
+        }
+        Student other = (Student) obj;
 
         // Step 3:
         // Compare IDs
+        return this.id == other.id;
 
-        return false;
     }
 
     @Override

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

@@ -12,12 +12,11 @@ public class StudentManager {
     public void addStudents(ArrayList<Student> newStudents) {
 
         // TODO:
-
         // Merge students
 
         // Hint:
         // addAll()
-
+        students.addAll(newStudents);
     }
 
     public Student searchStudent(int id) {
@@ -27,6 +26,11 @@ public class StudentManager {
         // Loop through students
 
         // Compare IDs
+        for (Student student : students) {
+            if (student.getId() == id) {
+                return student;
+            }
+        }
 
         return null;
     }
@@ -38,8 +42,14 @@ public class StudentManager {
         // Find student
 
         // Remove student
-
+        for (Student student : students) {
+            if (student.getId() == id) {
+                students.remove(student);
+                return true;
+            }
+        }
         return false;
+
     }
 
     public void printStudents() {

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

@@ -37,15 +37,19 @@ public class StudentLoader extends Thread {
 
             // TODO:
             // split line
-
+            String[] parts = line.split(",");
             // TODO:
             // read values
-
+            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
-
+            Student student = new Student(id, name, major, gpa);
             // TODO:
             // add to students list
+            students.add(student);
 
         }
 

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

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