implement triangle method

src/CourseRegistrationStarter/Student.java

@@ -1,12 +1,14 @@
 package CourseRegistrationStarter;
 import java.util.ArrayList;
 
-public class Student {
+public class Student
+    {
     private String name;
     private String studentId;
     private ArrayList<Course> registeredCourses;
 
-    public Student(String name, String studentId) {
+    public Student(String name, String studentId)
+    {
         this.name = name;
         this.studentId = studentId;
         this.registeredCourses = new ArrayList<>();
@@ -20,20 +22,55 @@ public class Student {
         return studentId;
     }
 
-    public boolean addCourse(Course c) {
-        // TODO: Register the student in the course if capacity allows
-        // Return true if registration was successful, otherwise false
-        return false;
+    public boolean addCourse(Course c)
+    {
+        // Register the student in the course if capacity allows
+        if (c.reduceCapacity())
+        { // Reduce capacity, returns true if successful (capacity > 0)
+            registeredCourses.add(c);
+            System.out.println(name + " successfully registered for course: " + c.getCourseName());
+            return true;
+        }
+        else
+        {
+            System.out.println(name + " could not register for course " + c.getCourseName() + ". Course is full.");
+            return false;
+        }
     }
 
-    public boolean dropCourse(Course c) {
-        // TODO: Remove the course from the student's list
+    public boolean dropCourse(Course c)
+    {
+        // 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
-        return false;
+        if (registeredCourses.contains(c))
+        {
+            registeredCourses.remove(c);
+            c.increaseCapacity(); // Restore capacity
+            System.out.println(name + " successfully dropped course: " + c.getCourseName());
+            return true;
+        }
+        else
+        {
+            System.out.println(name + " is not registered for course: " + c.getCourseName() + ", cannot drop.");
+            return false;
+        }
     }
 
-    public void showRegisteredCourses() {
-        // TODO: Print all registered courses
+    public void showRegisteredCourses()
+    {
+        // Print all registered courses
+        System.out.println("\n--- Courses Registered by " + name + " ---");
+        if (registeredCourses.isEmpty())
+        {
+            System.out.println(name + " is not registered for any courses.");
+        }
+        else
+        {
+            for (Course c : registeredCourses)
+            {
+                System.out.println("Name: " + c.getCourseName() + ", Code: " + c.getCourseCode());
+            }
+        }
+        System.out.println("------------------------------------\n");
     }
 }