Adjusted the implementation of Cases 6-9 from the new menu to the older ones

src/main/java/org/example/Administration.java

@@ -407,6 +407,70 @@ public class Administration {
 
     }
 
+
+    public void createCourse(String courseName, String courseID, int credits) {
+        // Check if a course with the given ID already exists
+        if (findCourseByID(courseID) != null) {
+            System.out.println("A course with ID " + courseID + " already exists.");
+        } else {
+            Course newCourse = new Course(courseName, courseID, credits);
+            courses.add(newCourse);
+            System.out.println("Course " + courseName + " (" + courseID + ") created successfully.");
+        }
+    }
+
+    public boolean enrollStudentInCourse(String studentId, String courseId) {
+        Student student = findStudentById(studentId);
+        Course course = findCourseByID(courseId);
+        if (student != null && course != null) {
+            // If the course is not already enrolled
+            if (!student.getCourseGrades().containsKey(course)) {
+                student.getCourseGrades().put(course, "Not Graded");
+                System.out.println("Student " + studentId + " enrolled in course " + courseId + ".");
+                return true;
+            } else {
+                System.out.println("Student " + studentId + " is already enrolled in course " + courseId + ".");
+                return false;
+            }
+        } else {
+            if (student == null) System.out.println("Student ID not found.");
+            if (course == null) System.out.println("Course ID not found.");
+            return false;
+        }
+    }
+
+    public void viewCourses() {
+        if (courses.isEmpty()) {
+            System.out.println("No courses available.");
+        } else {
+            System.out.println("Available Courses:");
+            for (Course course : courses) {
+                course.printCourseInfo();
+            }
+        }
+    }
+
+
+    public boolean assignGradeToStudent(String studentId, String courseId, String grade) {
+        Student student = findStudentById(studentId);
+        // First, find the course by ID to ensure it exists in the system.
+        Course course = findCourseByID(courseId);
+
+        if (student != null && course != null) {
+            // Check if the student is enrolled in the specified course.
+            if (student.getCourseGrades().containsKey(course)) {
+                // Student is enrolled in the course, proceed to assign the grade.
+                student.getCourseGrades().put(course, grade);
+                return true;
+            } else {
+                // Student is not enrolled in the specified course.
+                System.out.println("Student is not enrolled in the specified course.");
+                return false;
+            }
+        }
+        return false;
+    }
+
 }
 
 

src/main/java/org/example/Main.java

@@ -58,10 +58,23 @@ public class Main {
                     // Delete Course
                     break;
                 case 8:
-                    // View Courses
+                    administration.viewCourses();
                     break;
-                case 9:
+                case 9:{
                     // Assign Grade to Student
+                    System.out.println("Assign Grade to Student selected");
+                    System.out.print("Enter Student ID: ");
+                    String toBeGradedStudentId = scanner.next();
+                    System.out.print("Enter Course ID: ");
+                    String toBeGradedCourseId = scanner.next();
+                    System.out.print("Enter Grade: ");
+                    String grade = scanner.next();
+                    boolean success = administration.assignGradeToStudent(toBeGradedStudentId, toBeGradedCourseId, grade);
+                    if (success) {
+                        System.out.println("Grade assigned successfully.");
+                    } else {
+                        System.out.println("Failed to assign grade. Ensure the student and course IDs are correct.");
+                    }}
                     break;
                 case 10:
                     // View Grades from Student

src/main/java/org/example/Student.java

@@ -107,6 +107,10 @@ public class Student {
         return students;
     }
 
+    public void assignGrade(Course course, String grade) {
+        this.courseGrades.put(course, grade);
+    }
+
 
 
 }