uummm

src/CourseRegistrationStarter/Main.java

@@ -1,14 +1,90 @@
 package CourseRegistrationStarter;
 
+import java.util.Scanner;
+
 public class Main {
+
     public static void main(String[] args) {
-        // TODO:
-        // 1. Create at least 3 courses
-        // 2. Create 1 student
-        // 3. Create a registration system
-        // 4. Add courses to the system
-        // 5. Register the student in some courses
-        // 6. Drop one course
-        // 7. Print the final registered course list
+
+        Scanner input = new Scanner(System.in);
+
+        Course c1 = new Course("Advanced Programming", "AP1404", 2);
+        Course c2 = new Course("Data Structures", "DS2201", 1);
+        Course c3 = new Course("Database Systems", "DB3301", 3);
+
+        Student student = new Student("Ali", "402222001");
+
+        RegistrationSystem system = new RegistrationSystem();
+
+        system.addCourseToSystem(c1);
+        system.addCourseToSystem(c2);
+        system.addCourseToSystem(c3);
+
+        int choice;
+
+        do {
+
+            System.out.println();
+            System.out.println("1. Show all courses");
+            System.out.println("2. Register course");
+            System.out.println("3. Drop course");
+            System.out.println("4. Show my courses");
+            System.out.println("5. Exit");
+            System.out.print("Choose: ");
+
+            choice = input.nextInt();
+            input.nextLine();
+
+            switch (choice) {
+
+                case 1:
+                    system.showAllCourses();
+                    break;
+
+                case 2:
+
+                    System.out.print("Enter course code: ");
+                    String code = input.nextLine();
+
+                    Course course = system.findCourseByCode(code);
+
+                    if (course != null) {
+                        student.addCourse(course);
+                    } else {
+                        System.out.println("Course not found.");
+                    }
+
+                    break;
+
+                case 3:
+
+                    System.out.print("Enter course code: ");
+                    String dropCode = input.nextLine();
+
+                    Course dropCourse = system.findCourseByCode(dropCode);
+
+                    if (dropCourse != null) {
+                        student.dropCourse(dropCourse);
+                    } else {
+                        System.out.println("Course not found.");
+                    }
+
+                    break;
+
+                case 4:
+                    student.showRegisteredCourses();
+                    break;
+
+                case 5:
+                    System.out.println("Goodbye");
+                    break;
+
+                default:
+                    System.out.println("Invalid choice");
+
+            }
+
+        } while (choice != 5);
+
     }
 }

src/CourseRegistrationStarter/RegistrationSystem.java

@@ -1,7 +1,9 @@
 package CourseRegistrationStarter;
+
 import java.util.ArrayList;
 
 public class RegistrationSystem {
+
     private ArrayList<Course> courses;
 
     public RegistrationSystem() {
@@ -9,16 +11,34 @@ public class RegistrationSystem {
     }
 
     public void addCourseToSystem(Course c) {
-        // TODO: Add the course to the system
+        courses.add(c);
     }
 
     public Course findCourseByCode(String code) {
-        // TODO: Search for a course by course code
-        // Return the matching course if found, otherwise return null
+
+        for (Course c : courses) {
+
+            if (c.getCourseCode().equalsIgnoreCase(code)) {
+                return c;
+            }
+
+        }
+
         return null;
     }
 
     public void showAllCourses() {
-        // TODO: Print all courses in the system
+
+        for (Course c : courses) {
+
+            System.out.println(
+                    c.getCourseName() +
+                            " (" + c.getCourseCode() + ")" +
+                            " - Capacity: " +
+                            c.getCapacity()
+            );
+
+        }
+
     }
 }

src/CourseRegistrationStarter/Student.java

@@ -1,7 +1,9 @@
 package CourseRegistrationStarter;
+
 import java.util.ArrayList;
 
 public class Student {
+
     private String name;
     private String studentId;
     private ArrayList<Course> registeredCourses;
@@ -9,31 +11,52 @@ public class Student {
     public Student(String name, String studentId) {
         this.name = name;
         this.studentId = studentId;
-        this.registeredCourses = new ArrayList<>();
-    }
-
-    public String getName() {
-        return name;
-    }
-
-    public String getStudentId() {
-        return studentId;
+        registeredCourses = new ArrayList<>();
     }
 
     public boolean addCourse(Course c) {
-        // TODO: Register the student in the course if capacity allows
-        // Return true if registration was successful, otherwise false
+
+        if (registeredCourses.contains(c)) {
+            System.out.println("Already registered in this course.");
+            return false;
+        }
+
+        if (c.reduceCapacity()) {
+            registeredCourses.add(c);
+            System.out.println("Course registered successfully.");
+            return true;
+        }
+
+        System.out.println("Course capacity is full.");
         return false;
     }
 
     public boolean dropCourse(Course c) {
-        // TODO: Remove the course from the student's list
-        // Restore the course capacity if removal was successful
-        // Return true if the course was dropped, otherwise false
+
+        if (registeredCourses.remove(c)) {
+            c.increaseCapacity();
+            System.out.println("Course dropped successfully.");
+            return true;
+        }
+
+        System.out.println("You are not registered in this course.");
         return false;
     }
 
     public void showRegisteredCourses() {
-        // TODO: Print all registered courses
+
+        if (registeredCourses.isEmpty()) {
+            System.out.println("No registered courses.");
+            return;
+        }
+
+        System.out.println("Your Courses:");
+
+        for (Course c : registeredCourses) {
+            System.out.println(
+                    c.getCourseName() + " (" + c.getCourseCode() + ")"
+            );
+        }
     }
-}
+}
+