Fixing reported bugs.

src/CourseRegistrationStarter/Main.java

@@ -2,13 +2,23 @@ package CourseRegistrationStarter;
 
 public class Main {
     public static void main(String[] args) {
-        // TODO:
+        Course BP = new Course("Basic Programing", "1000", 5);
-        // 1. Create at least 3 courses
+        Course AP = new Course("Advanced Programing", "1001", 5);
-        // 2. Create 1 student
+        Course M = new Course("Math", "1002", 5);
-        // 3. Create a registration system
+
-        // 4. Add courses to the system
+        Student shayan = new Student("Shayan", "404212345");
-        // 5. Register the student in some courses
+
-        // 6. Drop one course
+        RegistrationSystem regSys = new RegistrationSystem();
-        // 7. Print the final registered course list
+        regSys.addCourseToSystem(AP);
+        regSys.addCourseToSystem(BP);
+        regSys.addCourseToSystem(M);
+
+        shayan.addCourse(BP);
+        shayan.addCourse(AP);
+        shayan.addCourse(M);
+
+        shayan.dropCourse(M);
+
+        shayan.showRegisteredCourses();
     }
 }

src/CourseRegistrationStarter/RegistrationSystem.java

@@ -9,16 +9,21 @@ 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++)
-        // Return the matching course if found, otherwise return null
+            if (courses.get(i).getCourseCode().equals(code))
+                return courses.get(i);
         return null;
     }
 
     public void showAllCourses() {
-        // TODO: Print all courses in the system
+        for (Course course : this.courses) {
+            System.out.println("----------------------------------------------");
+            System.out.printf("Course Name: %s| Course ID: %s | Capacity %d\n", course.getCourseName(), course.getCourseCode(), course.getCapacity());
+            System.out.println("----------------------------------------------");
+        }
     }
 }

src/CourseRegistrationStarter/Student.java

@@ -21,19 +21,30 @@ public class Student {
     }
 
     public boolean addCourse(Course c) {
-        // TODO: Register the student in the course if capacity allows
+        if(registeredCourses.contains(c))
-        // Return true if registration was successful, otherwise false
+            return false;
+        if((c.getCapacity() > 0)){
+            this.registeredCourses.add(c);
+            c.reduceCapacity();
+            return true;
+        }
         return false;
     }
 
     public boolean dropCourse(Course c) {
-        // TODO: Remove the course from the student's list
+        for(int i = 0; i < this.registeredCourses.size(); i++){
-        // Restore the course capacity if removal was successful
+            if (this.registeredCourses.get(i).getCourseCode().equals(c.getCourseCode())){
-        // Return true if the course was dropped, otherwise false
+                this.registeredCourses.remove(i);
+                c.increaseCapacity();
+                return true;
+            }
+        }
         return false;
     }
 
     public void showRegisteredCourses() {
-        // TODO: Print all registered courses
+        for(int i = 0; i < registeredCourses.size(); i++){
+            System.out.println(this.registeredCourses.get(i).getCourseName() + ", code: " + this.registeredCourses.get(i).getCourseCode());
+        }
     }
 }