implement bonus features

src/CourseRegistrationStarter/Main.java

@@ -7,7 +7,7 @@ public class Main {
         Course DataStructures = new Course("DataStructures", "DS2201", 1);
         Course DatabaseSystems = new Course("DatabaseSystems", "DB3301", 3);
 
-        Student fateme = new Student("fateme", "404222000");
+        Student fateme = new Student("fateme", "404222000", 10);
 
         RegistrationSystem A = new RegistrationSystem();
 

src/CourseRegistrationStarter/RegistrationSystem.java

@@ -12,7 +12,10 @@ public class RegistrationSystem {
 
         for (int i=0 ; i < courses.size() ; i++) {
 
-            if(courses.get(i).getCourseCode().equals(c.getCourseCode())) {
+            if(courses.get(i).getCourseCode().equals(c.getCourseCode()) ||
+                    courses.get(i).getCourseName().equals(c.getCourseName())) {
+
+                System.out.println("Course name or code already exists.");
                 return;
             }
         }
@@ -31,6 +34,15 @@ public class RegistrationSystem {
         return null;
     }
 
+    public Course findCourseByName(String name) {
+
+        for(int i=0 ; i<courses.size() ; i++) {
+            if(courses.get(i).getCourseName().equals(name))
+                return courses.get(i);
+        }
+        return null;
+    }
+
     public void showAllCourses() {
         for(int i=0 ; i < courses.size() ; i++) {
             System.out.print("Course");

src/CourseRegistrationStarter/Student.java

@@ -2,14 +2,16 @@ package CourseRegistrationStarter;
 import java.util.ArrayList;
 
 public class Student {
-    private String name;
-    private String studentId;
+    private final String name;
+    private final String studentId;
     private ArrayList<Course> registeredCourses;
+    private int courseLimit;
 
-    public Student(String name, String studentId) {
+    public Student(String name, String studentId, int courseLimit) {
         this.name = name;
         this.studentId = studentId;
         this.registeredCourses = new ArrayList<>();
+        this.courseLimit = courseLimit;
     }
 
     public String getName() {
@@ -22,7 +24,7 @@ public class Student {
 
     public boolean addCourse(Course c) {
 
-        if(c.getCapacity() > 0) {
+        if(c.getCapacity() > 0 && registeredCourses.size() < courseLimit) {
             registeredCourses.add(c);
             c.reduceCapacity();
             return true;
@@ -30,6 +32,11 @@ public class Student {
         return false;
     }
 
+    public void setCourseLimit(int amount) {
+        if(amount>0)
+            courseLimit = amount;
+    }
+
     public boolean dropCourse(Course c) {
         if (registeredCourses.remove(c)) {
             c.increaseCapacity();