From ef4f7f488547c51ef736c7d1ca629d7f97e11cce Mon Sep 17 00:00:00 2001
From: Reza <you@example.com>
Date: Mon, 20 Apr 2026 13:32:40 +0330
Subject: [PATCH] Completed

---
 src/CourseRegistrationStarter/Main.java       | 28 ++++++++++++-----
 .../RegistrationSystem.java                   | 23 +++++++++++---
 src/CourseRegistrationStarter/Student.java    | 30 +++++++++++++++----
 3 files changed, 63 insertions(+), 18 deletions(-)

diff --git a/src/CourseRegistrationStarter/Main.java b/src/CourseRegistrationStarter/Main.java
index 8f06373..1ea3b44 100644
--- a/src/CourseRegistrationStarter/Main.java
+++ b/src/CourseRegistrationStarter/Main.java
@@ -2,13 +2,25 @@ package CourseRegistrationStarter;
 
 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
+
+        Course c1 = new Course("Math", "M10", 5);
+        Course c2 = new Course("History", "HK1", 4);
+        Course c3 = new Course("Programming", "CS2",2);
+
+        Student s1 = new Student("Reza", "404111111");
+
+        RegistrationSystem regSystem = new RegistrationSystem();
+
+        regSystem.addCourseToSystem(c1);
+        regSystem.addCourseToSystem(c2);
+        regSystem.addCourseToSystem(c3);
+
+        s1.addCourse(c1);
+        s1.addCourse(c3);
+
+        s1.dropCourse(c1);
+
+        s1.showRegisteredCourses();
+        regSystem.showAllCourses();
     }
 }
diff --git a/src/CourseRegistrationStarter/RegistrationSystem.java b/src/CourseRegistrationStarter/RegistrationSystem.java
index 934f222..0bc3efa 100644
--- a/src/CourseRegistrationStarter/RegistrationSystem.java
+++ b/src/CourseRegistrationStarter/RegistrationSystem.java
@@ -9,16 +9,31 @@ 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().equals(code)) {
+                return c ;
+            }
+        }
+        return null;
+    }
+    //Bonus
+    public Course findCourseByName(String name) {
+        for (Course c : courses) {
+            if (c.getCourseName().equals(name)) {
+                return c;
+            }
+        }
         return null;
     }
 
     public void showAllCourses() {
-        // TODO: Print all courses in the system
+        System.out.println("All courses : ");
+        for (Course c : courses) {
+            System.out.println("  " + c.getCourseName() + " -- " + c.getCourseCode() + " - " + c.getCapacity());
+        }
     }
 }
diff --git a/src/CourseRegistrationStarter/Student.java b/src/CourseRegistrationStarter/Student.java
index 02c11d8..0d61c6c 100644
--- a/src/CourseRegistrationStarter/Student.java
+++ b/src/CourseRegistrationStarter/Student.java
@@ -5,6 +5,7 @@ public class Student {
     private String name;
     private String studentId;
     private ArrayList<Course> registeredCourses;
+    private static final int maxCourses = 2; //Bonus
 
     public Student(String name, String studentId) {
         this.name = name;
@@ -21,19 +22,36 @@ public class Student {
     }
 
     public boolean addCourse(Course c) {
-        // TODO: Register the student in the course if capacity allows
-        // Return true if registration was successful, otherwise false
+        //Bonus
+        for (Course course : registeredCourses) {
+            if (course.getCourseCode().equals(c.getCourseCode())) {
+                return false;
+            }
+        }
+        //Bonus
+        if (registeredCourses.size() >= maxCourses) {
+            return false;
+        }
+        if (c.getCapacity() > 0) {
+            registeredCourses.add(c);
+            c.reduceCapacity();
+            return true;
+        }
         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();
+            return true;
+        }
         return false;
     }
 
     public void showRegisteredCourses() {
-        // TODO: Print all registered courses
+        System.out.println("Registered courses : ");
+        for (Course c : registeredCourses) {
+            System.out.println("  " + c.getCourseName() + " -- " + c.getCourseCode());
+        }
     }
 }
\ No newline at end of file
-- 
2.54.0