diff --git a/1ano/2semestre/poo/src/aula11/ex2/Gradebook.java b/1ano/2semestre/poo/src/aula11/ex2/Gradebook.java
new file mode 100644
index 0000000..00867ed
--- /dev/null
+++ b/1ano/2semestre/poo/src/aula11/ex2/Gradebook.java
@@ -0,0 +1,57 @@
+package aula11.ex2;
+
+import utils.MathTools;
+
+import java.io.*;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.*;
+
+public class Gradebook implements IGradeCalculator {
+    private final LinkedList<Student> students = new LinkedList<>();
+
+    public void load(String filename) {
+        LinkedList<String> lines = new LinkedList<>();
+        Path path = Paths.get(filename);
+        try {
+            lines = new LinkedList<>(Files.readAllLines(path));
+		} catch (IOException e) {
+			System.out.printf("Certifique-se que o ficheiro \"%s\" está na raiz da pasta do projeto", path);
+            System.exit(1);
+		}
+
+        for (String line : lines) {
+            String[] data = line.split("\\|");
+            String name = data[0];
+            LinkedList<Double> grades = new LinkedList<>(Arrays.stream(data).toList().subList(1, data.length).stream().map(Double::parseDouble).toList());
+            students.add(new Student(name, grades));
+        }
+    }
+
+    public void addStudent(Student newStudent) {
+        students.add(newStudent);
+    }
+
+    public void removeStudent(String name) {
+        students.removeIf(student -> student.getName().equals(name));
+    }
+
+    public Student getStudent(String name) {
+        return students.stream().filter(student -> student.getName().equals(name)).findFirst().orElse(null);
+    }
+
+    public double calculateAverageGrade(String name) {
+        return calculate(getStudent(name).getGrades());
+    }
+
+    @Override
+    public double calculate(LinkedList<Double> grades) {
+        return MathTools.media(grades);
+    }
+
+    public void printAllStudents() {
+        for (Student student : students)
+            System.out.printf("Nome: %s%nNota Final: %.2f%n%n", student.getName(), calculate(student.getGrades()));
+    }
+}
diff --git a/1ano/2semestre/poo/src/aula11/ex2/GradebookTester.java b/1ano/2semestre/poo/src/aula11/ex2/GradebookTester.java
new file mode 100644
index 0000000..a1b8bb5
--- /dev/null
+++ b/1ano/2semestre/poo/src/aula11/ex2/GradebookTester.java
@@ -0,0 +1,32 @@
+package aula11.ex2;
+
+import java.util.LinkedList;
+import java.util.List;
+
+public class GradebookTester {
+    public static void main(String[] args) {
+        // Create a new Gradebook instance
+        Gradebook gradebook = new Gradebook();
+
+        // Load the student data from a text file
+        gradebook.load("datafiles/aula11/ex2/alunos.txt");
+
+        // Add a new student to the collection
+        Student newStudent = new Student("Johny May", new LinkedList<>(List.of(10.0, 15.0, 19.0)));
+        gradebook.addStudent(newStudent);
+
+        // Remove a student from the collection
+        gradebook.removeStudent("Jane Smith");
+
+        // Retrieve a student from the collection
+        Student student = gradebook.getStudent("John Doe");
+
+        // Calculate the average grade for a specific student
+        double averageGrade = gradebook.calculateAverageGrade("John Doe");
+        System.out.println("Average grade for John Doe: " + averageGrade);
+
+        // Print a summary of all students in the collection
+        gradebook.printAllStudents();
+    }
+}
+
diff --git a/1ano/2semestre/poo/src/aula11/ex2/IGradeCalculator.java b/1ano/2semestre/poo/src/aula11/ex2/IGradeCalculator.java
new file mode 100644
index 0000000..3c41645
--- /dev/null
+++ b/1ano/2semestre/poo/src/aula11/ex2/IGradeCalculator.java
@@ -0,0 +1,7 @@
+package aula11.ex2;
+
+import java.util.LinkedList;
+
+public interface IGradeCalculator {
+    double calculate(LinkedList<Double> grades);
+}
diff --git a/1ano/2semestre/poo/src/aula11/ex2/Student.java b/1ano/2semestre/poo/src/aula11/ex2/Student.java
new file mode 100644
index 0000000..2229373
--- /dev/null
+++ b/1ano/2semestre/poo/src/aula11/ex2/Student.java
@@ -0,0 +1,30 @@
+package aula11.ex2;
+
+import java.util.LinkedList;
+
+public class Student {
+
+    private String name;
+    private LinkedList<Double> grades;
+
+    public Student(String name, LinkedList<Double> grades) {
+        this.name = name;
+        this.grades = grades;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public LinkedList<Double> getGrades() {
+        return grades;
+    }
+
+    public void setGrades(LinkedList<Double> grades) {
+        this.grades = grades;
+    }
+}