Complete all classes .

.idea/.name

@@ -0,0 +1 @@
+Course.java

src/CourseRegistrationStarter/Main.java

@@ -4,11 +4,36 @@ public class Main {
     public static void main(String[] args) {
         // TODO:
         // 1. Create at least 3 courses
+
+        Course course1 = new Course("Advanced Programming" , "AP1404", 2) ;
+        Course course2 = new Course("Data Structures", "DS2201", 1) ;
+        Course course3 = new Course("Database Systems", "DB3301", 3) ;
+        
         // 2. Create 1 student
+        
+        Student student1 = new Student ("Ali", "402222001") ;
+        
         // 3. Create a registration system
+
+        RegistrationSystem registrationSystem = new RegistrationSystem() ;
+
         // 4. Add courses to the system
+
+        registrationSystem.addCourseToSystem(course1) ;
+        registrationSystem.addCourseToSystem(course2) ;
+        registrationSystem.addCourseToSystem(course3) ;
+        
         // 5. Register the student in some courses
+
+        student1.addCourse(course1) ;
+        student1.addCourse(course2) ;
+        student1.addCourse(course3) ;
         // 6. Drop one course
+
+        student1.dropCourse(course2) ;
         // 7. Print the final registered course list
+
+        student1.showRegisteredCourses() ;
+        registrationSystem.showAllCourses();
     }
 }

src/CourseRegistrationStarter/RegistrationSystem.java

@@ -10,15 +10,27 @@ 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
+        for (int i = 0 ; i < courses.size() ; i++)
+        {
+            if ( courses.get(i).getCourseCode().equals(code))
+            {
+                return courses.get(i);
+            }
+        }
         // Return the matching course if found, otherwise return null
         return null;
     }
 
     public void showAllCourses() {
         // TODO: Print all courses in the system
+        for (int i = 0 ; i < courses.size() ; i++)
+        {
+            System.out.println(courses.get(i).getCourseName() + " (" + courses.get(i).getCourseCode() + ") - Remaining Capacity: " + courses.get(i).getCapacity());
+        }
     }
 }

src/CourseRegistrationStarter/Student.java

@@ -22,12 +22,26 @@ public class Student {
 
     public boolean addCourse(Course c) {
         // TODO: Register the student in the course if capacity allows
+
+        if (c.getCapacity() > 0)
+        {
+            registeredCourses.add(c) ;
+            c.reduceCapacity() ;  
+            return true ;
+        }
         // Return true if registration was successful, otherwise false
         return false;
     }
 
     public boolean dropCourse(Course c) {
         // TODO: Remove the course from the student's list
+
+        if (registeredCourses.remove(c))
+        {
+            c.increaseCapacity() ;
+            return true ; 
+
+        }
         // Restore the course capacity if removal was successful
         // Return true if the course was dropped, otherwise false
         return false;
@@ -35,5 +49,10 @@ public class Student {
 
     public void showRegisteredCourses() {
         // TODO: Print all registered courses
+
+        for(int i = 0 ; i < registeredCourses.size() ; i++)
+        {
+            System.out.println(registeredCourses.get(i).getCourseName() + " - " + registeredCourses.get(i).getCourseCode());
+        }
     }
 }