Updated Students Main Class

package com.company;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        menu();
    }

    public static void menu(){
        Scanner input = new Scanner(System.in);
        while(true){
            System.out.println("Select an option: ");
            System.out.println("1. Add");
            System.out.println("2. View");
            System.out.println("3. Update");
            System.out.println("4. Remove");
            System.out.println("5. Exit\n");
            System.out.print("Choice: ");

            Student student;

            switch(input.nextInt()){
                case 1:
                    System.out.println("\nAdding a student: ");
                    System.out.print("Name: ");
                    String addName = input.next();
                    System.out.print("Level: ");
                    int addLevel = input.nextInt();
                    System.out.print("Grade: ");
                    int addGrade = input.nextInt();
                    System.out.print("Course Name: ");
                    String addCourseName = input.next();
                    System.out.print("Course Hours: ");
                    int addCourseHours = input.nextInt();
                    System.out.print("Course Grade: ");
                    String addCourseGrade = input.next();
                    student = new Student(addName, addLevel, addGrade, addCourseName, addCourseHours, addCourseGrade);
                    student.addStudent(student);
                    System.out.println("Student added successfully!");
                    break;
                case 2:
                    student = new Student();
                    if(student.studentsNumber() > 0){
                        System.out.print("\n1. Search for student\n2. Search for students in course\nChoice: ");
                        int choice = input.nextInt();
                        if(choice == 1){
                            System.out.print("Student name: ");
                            String searchName = input.next();
                            System.out.println("Viewing student: ");
                            student.view(searchName);
                        }
                        else if(choice == 2){
                            System.out.print("Course name: ");
                            String searchCourse = input.next();
                            student.studentsInCourse(searchCourse);
                        }
                        else{
                            System.out.println("Invalid choice.");
                        }

                    }
                    else{
                        System.out.println("Error, there are no students.");
                    }
                    break;
                case 3:
                    student = new Student();
                    if(student.studentsNumber() > 0){
                        System.out.println("\nUpdating a student: ");
                        System.out.print("Index: ");
                        int updateIndex = input.nextInt();
                        if(updateIndex < student.studentsNumber()) {
                            System.out.print("Name: ");
                            String updateName = input.next();
                            System.out.print("Level: ");
                            int updateLevel = input.nextInt();
                            System.out.print("Grade: ");
                            int updateGrade = input.nextInt();
                            System.out.print("Course Name: ");
                            String updateCourseName = input.next();
                            System.out.print("Course Hours: ");
                            int updateHours = input.nextInt();
                            System.out.print("Course Grade: ");
                            String updateCourseGrade = input.next();
                            student.update(updateIndex, updateName, updateLevel, updateGrade,
                                    updateCourseName, updateHours, updateCourseGrade);
                        }
                        else{
                            System.out.println("Error, index is out of bounds.");
                        }
                    }
                    else{
                        System.out.println("Error, there are no students.");
                    }
                    break;
                case 4:
                    student = new Student();
                    if(student.studentsNumber() > 0){
                        System.out.println("\nRemoving a student (starting from 1): ");
                        System.out.print("Index: ");
                        int removeIndex = input.nextInt();
                        if((removeIndex-1) < student.studentsNumber()){
                            student.remove(removeIndex-1);
                        }
                        else{
                            System.out.println("Error, index is out of bounds.");
                        }
                    }
                    else{
                        System.out.println("Error, there are no students.");
                    }
                    break;
                case 5:
                    System.out.print("The program will exit.");
                    System.exit(0);
                    break;
                default:
                    System.out.println("Error, enter a valid option.");
            }
        }
    }
}