matin mortazavi / i did my Assignment + bonus

src/CourseRegistrationStarter/Main.java

@@ -10,5 +10,20 @@ public class Main {
         // 5. Register the student in some courses
         // 6. Drop one course
         // 7. Print the final registered course list
+        RegistrationSystem reg = new RegistrationSystem() ;
+        Course Ap = new Course("ap" , "1404" , 2 );
+        reg.addCourseToSystem(Ap) ;
+        Course DS = new Course("DS" , "2201" , 1 );
+        reg.addCourseToSystem(DS);
+        Course DB = new Course("Db" , "3301" , 3 );
+        reg.addCourseToSystem(DB);
+        Student Ali = new Student("ali" , "402222001") ;
+        Ali.addCourse(Ap) ;
+        Ali.addCourse(DB) ;
+        Ali.dropCourse(Ap) ;
+        Ali.showRegisteredCourses();
+        reg.showcapacity();
+
+
     }
 }

src/CourseRegistrationStarter/RegistrationSystem.java

@@ -1,5 +1,6 @@
 package CourseRegistrationStarter;
 import java.util.ArrayList;
+import java.util.Objects;
 
 public class RegistrationSystem {
     private ArrayList<Course> courses;
@@ -10,15 +11,61 @@ public class RegistrationSystem {
 
     public void addCourseToSystem(Course c) {
         // TODO: Add the course to the system
+        if (courses.contains(c)) {
+            System.out.println("you cant add this course !!");
+        }
+        else
+        {
+            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 item : courses)
+        {
+            if (Objects.equals(item.getCourseCode(), code)) {
+
+                return item ;
+            }
+
+        }
+        return null;
+
+    }
+    public Course findCourseByName(String name)
+    {
+        for (Course item : courses)
+        {
+            if (Objects.equals(item.getCourseCode(), name)) {
+
+                return item ;
+            }
+
+        }
         return null;
     }
 
     public void showAllCourses() {
         // TODO: Print all courses in the system
+        for (Course item : courses)
+        {
+            System.out.print("course name : ");
+            System.out.print(item.getCourseName());
+            System.out.print("  , course code");
+            System.out.print(item.getCourseCode());
+            System.out.print("  , course capacity");
+            System.out.print(item.getCapacity());
+
+        }
+    }
+    public void showcapacity(){
+        for (Course item : courses)
+        {
+            System.out.println(item.getCapacity());
+        }
     }
 }

src/CourseRegistrationStarter/Student.java

@@ -23,17 +23,46 @@ 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
-        return false;
+        if (registeredCourses.size()<= 10) {
+            if (c.reduceCapacity()) {
+                registeredCourses.add(c);
+                return true;
+            } else {
+
+                return false;
+            }
+        }
+        else
+        {
+            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
-        return false;
+        int ind = registeredCourses.indexOf(c) ;
+        if (ind != -1 )
+        {
+            registeredCourses.remove(ind) ;
+            c.increaseCapacity();
+            return true ;
+        }
+        else {
+            return false;
+        }
     }
 
     public void showRegisteredCourses() {
         // TODO: Print all registered courses
+        for (Course item : registeredCourses)
+        {
+            System.out.print("course name : ");
+            System.out.print(item.getCourseName());
+            System.out.print("  , course code");
+            System.out.print(item.getCourseCode());
+
+        }
     }
 }