SCRAMEApp.java

import java.io.*;
import java.util.*;

/**
 * Represents the SCRAME application
 * The application allows the creation of courses and adding of student records.
 * @author Group3
 * @version 1.0
 */
public class SCRAMEApp {

    /**
     * Scanner class for input.
     */
    private static Scanner sc;

    /**
     * An array of <code>Course</code> object storing all the courses.
     */
    private static ArrayList<Course> courseList;

    /**
     * Number of students in the system.
     */
    private static Integer studentCount;

    /**
     * An array of <code>Student</code> object storing all the students.
     */
    private static ArrayList<Student> studentList;

    /**
     * Number of courses in the system.
     */
    private static Integer courseCount;

    /**
     * A dictionary to store all MatricNumber.
     * key: matricNumber, value: the index of corresponding students in <code>studentList</code>
     */
    private static HashMap<String, Integer> allMatricNos;

    /**
     * A dictionary to store all Coursecodes.
     * key:Coursecode , value: the index of corresponding course in <code>courseList</code>
     */
    private static HashMap<String, Integer> allCourseCodes;

    /**
     * An array of <code>Faculty</code> object storing all the faculties.
     */
    private static ArrayList<Faculty> facultyList;

    /**
     * A dictionary to store all faculties.
     * key: faculty id, value: the index of corresponding faculty in <cpode>facultyList</cpode>
     */
    private static HashMap<String, Integer>  allfaculties;

    /**
     * An array of strings storing ordinal number from one to twenty four.
     * will be used in system output
     */
    private static String[] ordinals = {"1st", "2nd", "3rd", "4th", "5th", "6th", "7th", "8th", "9th", "10th", "11th", "12th", "13th", "14th", "15th", "16th", "17th", "18th", "19th", "20th", "21st", "22nd", "23rd", "24th"};

    /**
     * The main application function.
     * Only accessible by the administrator of this application.
     * @param args input of the main function
     * @throws IOException input/output exceptions thrown by main function      
     */
    public static void main(String[] args) throws IOException{
        facultyList = new ArrayList<>();
        allfaculties = new HashMap<>();
        File faculties = new File("./FacultyList");
        BufferedReader br = new BufferedReader(new FileReader(faculties));
        int n = Integer.parseInt(new StringTokenizer(br.readLine()).nextToken());
        for(int i = 0; i < n; i++){
            br.readLine();
            String id = br.readLine();
            String name = br.readLine();
            String title = br.readLine();
            String description = br.readLine();
            allfaculties.put(id, i);
            facultyList.add(new Faculty(name, title, description, id));
        }
        sc = new Scanner(System.in);
        courseList = (ArrayList<Course>)readObject("./courseList");
        if(courseList == null)
            courseList = new ArrayList<>();
        studentList = (ArrayList<Student>)readObject("./studentList");
        if(studentList == null)
            studentList = new ArrayList<>();
        allMatricNos = (HashMap<String, Integer>)readObject("./allMatricNos");
        if(allMatricNos == null)
            allMatricNos = new HashMap<>();
        allCourseCodes = (HashMap<String, Integer>)readObject("./allCourseCodes");
        if(allCourseCodes == null)
            allCourseCodes = new HashMap<>();
        courseCount = (Integer)readObject("./courseCount");
        if(courseCount == null)
            courseCount = 0;
        studentCount = (Integer)readObject("./studentCount");
        if(studentCount == null)
            studentCount = 0;
        System.out.println("Welcome to the SCRAME System! It's a good day, isn't it? ;>");
        System.out.println();
        while(true){
            System.out.println("Please choose from the following list of operations (enter a number between 1 and 13):");
            System.out.println("1. Add a student");
            System.out.println("2. Add a course");
            System.out.println("3. Print current students in the system");
            System.out.println("4. Print current courses in the system");
            System.out.println("5. Register student for a course (this includes registering for Tutorial/Lab classes");
            System.out.println("6. Check available slot in a class (vacancy in a class)");
            System.out.println("7. Print student list by lecture, tutorial or laboratory session for a course");
            System.out.println("8. Enter course assessment components weightage");
            System.out.println("9. Enter coursework mark - inclusive of its components");
            System.out.println("10. Enter exam mark");
            System.out.println("11. Print course statistics");
            System.out.println("12. Print student transcript");
            System.out.println("13. Save and Quit");

            int choice = 0;
            try{
                choice = sc.nextInt();
            }
            catch (Exception e){
                sc.next();
                System.out.println("The input is not valid, please enter a number between 1 and 13\n");
                continue;
            }
            if(choice < 1 || choice > 13){
                System.out.println("The input is not valid, please enter a number between 1 and 13\n");
                continue;
            }
            if(choice == 13) {
                saveObject(courseList, "./courseList");
                saveObject(studentList, "./studentList");
                saveObject(courseCount, "./courseCount");
                saveObject(studentCount, "./studentCount");
                saveObject(allCourseCodes, "./allCourseCodes");
                saveObject(allMatricNos, "./allMatricNos");
                System.out.println("Thanks for using SCRAME, see you next time!");
                break;
            }
            else if(choice == 1){
                addStudent();
            }
            else if(choice == 3){
                printStudent();
            }
            else if(choice == 2){
                addCourse();
            }
            else if(choice == 4){
                printCourse();
            }
            else if (choice == 5){
                addStudentToCourse();
            }
            else if(choice == 6){
                checkVacancy();
            }
            else if(choice == 7){
                printStudentList();
            }
            else if(choice == 8){
                enterAssessmentWeightage();
            }
            else if(choice == 9){
                enterCourseWorkMark();
            }
            else if(choice == 10){
                enterExamMark();
            }
            else if(choice == 11){
                printCourseStatistic();
            }
            else if(choice == 12){
                printStudentTranscript();
            }

        }
    }

    /**
     * Adds a student to this system.
     * Since this is a private method. It will not be shown in the HTML file
     */
    private static void addStudent(){
        System.out.println("Please enter the student's name");
        sc.nextLine();
        String name = sc.nextLine();
        System.out.println("Please enter the Matriculation Number of " + name);
        String matricNo = sc.next();
        if(allMatricNos.containsKey(matricNo)){
            System.out.println("This Matriculation Number already exists in the system records, you can proceed with other operations\n");
            System.out.println();
            pressAnyKeyToContinue();
            return;
        }
        System.out.println("Please enter the school of " + name);
        String school = sc.next();
        int gender = 0;
        while(gender == 0){
            System.out.print("Please enter the gender of " + name);
            System.out.println(" (enter a number between 1 and 3)");
            System.out.println("1. Male");
            System.out.println("2. Female");
            System.out.println("3. Genderqueer");
            try{
                gender = sc.nextInt();
            }
            catch (Exception e){
                sc.next();
                gender = 0;
                System.out.println("The input is not valid, please enter a number between 1 and 3\n");
                continue;
            }
            if(gender < 1 || gender > 3){
                gender = 0;
                System.out.println("The input is not valid, please enter a number between 1 and 3\n");
            }
        }
        studentList.add(new Student(name, matricNo, school, gender));
        allMatricNos.put(matricNo, studentCount);
        studentCount++;
        System.out.println("You've successfully added the student " + name + " with Matric No. " + matricNo + " to the SCRAME System!");
        System.out.println();
        if(studentList.size() == 1)
            System.out.println("Below is the list of all current students, there is " + studentList.size() + " student in the system.");
        else
            System.out.println("Below is the list of all current students, there are altogether " + studentList.size() + " students in the system.");
        int count = 1;
        for(Student s:studentList){
            System.out.println("(" + count + ") Name: " + s.getName() + "  |  Matric Number: " + s.getMatricNo());
            count++;
        }
        System.out.println();
        pressAnyKeyToContinue();
    }

    /**
     * Prints name and matric number of all students in the school.
     * Since this is a private method. It will not be shown in the HTML file
     */
    private static void printStudent() {
        int count = 1;
        if (studentList.size() == 0) {
            System.out.println("There is no student in the system");
            pressAnyKeyToContinue();
            return;
        }
        System.out.println("Below is the list of all current students, there is " + studentList.size() + " student in the system.");
        for(Student s:studentList){
            System.out.println("(" + count + ") Name: " + s.getName() + "  |  Matric Number: " + s.getMatricNo());
            count++;
        }
        pressAnyKeyToContinue();
    }


    /**
     * Adds a course to this system(including tutorials and labs).
     * Since this is a private method. It will not be shown in the HTML file
     */
    private static void addCourse(){
        System.out.println("Please enter the Course Code");
        String name = sc.next();
        if(allCourseCodes.containsKey(name)){
            System.out.println("This Course Code already exists in the system records, you can proceed with other operations\n");
            System.out.println();
            pressAnyKeyToContinue();
            return;
        }
        System.out.println("Please enter the ID of the course coordinator for " + name);
        String ID = sc.next();
        while(!allfaculties.containsKey(ID)){
            System.out.println("There's no faculty in the system with ID " + ID + ", please check the correctness of the input and enter again\n");
            ID = sc.next();
        }
        System.out.println("Please enter the size of the lecture of this course");
        int lectureSize = 0;
        int lectureid = 0;
        while(lectureSize == 0){
            try{
                lectureSize = sc.nextInt();
            }
            catch (Exception e){
                sc.next();
                lectureSize = 0;
                System.out.println("The input is not valid, please enter a number\n");
                continue;
            }
            if(lectureSize <= 0){
                lectureSize = 0;
                System.out.println("The input is not valid, please enter a positive number\n");
            }
        }
        Lecture lecture = new Lecture(lectureid,lectureSize);
        ArrayList<Tutorial> tutorialList = new ArrayList<>();
        HashMap<Integer, Integer> tutorialDic = new HashMap<>();
        int choice = 0;
        while(choice == 0){
            System.out.println("Does this course contain any tutorial session? (enter 1 or 2)");
            System.out.println("1. Yes");
            System.out.println("2. No");
            try{
                choice = sc.nextInt();
            }
            catch (Exception e){
                sc.next();
                choice = 0;
                System.out.println("The input is not valid, please enter 1 or 2\n");
                continue;
            }
            if(choice != 1 && choice != 2){
                choice = 0;
                System.out.println("The input is not valid, please enter 1 or 2\n");
            }
        }
        if(choice == 1){
            System.out.println("Please enter the number of tutorial sessions");
            int number = 0;
            while(number == 0){
                try{
                    number = sc.nextInt();
                }
                catch (Exception e){
                    sc.next();
                    number = 0;
                    System.out.println("The input is not valid, please enter a number\n");
                    continue;
                }
                if(number <= 0){
                    number = 0;
                    System.out.println("The input is not valid, please enter a positive number\n");
                }
            }
            System.out.println("Please proceed with entering the information for the " + number + " tutorial sessions\n");
            for(int i = 0; i < number; i++){
                System.out.println("Please enter the ID of the " + ordinals[i] + " tutorial session");
                int id = -1;
                while(id == -1){
                    try{
                        id = sc.nextInt();
                    }
                    catch (Exception e){
                        sc.next();
                        id = -1;
                        System.out.println("The input is not valid, please enter a number\n");
                        continue;
                    }
                    if(id < 0){
                        id = -1;
                        System.out.println("The input is not valid, please enter a non-negative number\n");
                        continue;
                    }
                    if(tutorialDic.containsKey(id)){
                        id = -1;
                        System.out.println("This tutorial ID has existed for the course " + name + ", please enter another ID");
                    }
                }
                System.out.println("Please enter the size of the " + ordinals[i] + " tutorial session");
                int size = 0;
                while(size == 0){
                    try{
                        size = sc.nextInt();
                    }
                    catch (Exception e){
                        sc.next();
                        size = 0;
                        System.out.println("The input is not valid, please enter a number\n");
                        continue;
                    }
                    if(size <= 0){
                        size = 0;
                        System.out.println("The input is not valid, please enter a positive number\n");
                    }
                }
                Tutorial current = new Tutorial(id, size);
                System.out.println("A tutorial session with ID " + id + " and size " + size + " has been created\n");
                tutorialList.add(current);
                tutorialDic.put(id, i);
            }
            System.out.println("All " + number + " tutorial sessions have been created\n");
        }
        ArrayList<Lab> labList = new ArrayList<>();
        HashMap<Integer, Integer> labDic = new HashMap<>();
        choice = 0;
        while(choice == 0){
            System.out.println("Does this course contain any lab session? (enter 1 or 2)");
            System.out.println("1. Yes");
            System.out.println("2. No");
            try{
                choice = sc.nextInt();
            }
            catch (Exception e){
                sc.next();
                choice = 0;
                System.out.println("The input is not valid, please enter 1 or 2\n");
                continue;
            }
            if(choice != 1 && choice != 2){
                choice = 0;
                System.out.println("The input is not valid, please enter 1 or 2\n");
            }
        }
        if(choice == 1){
            System.out.println("Please enter the number of lab sessions");
            int number = 0;
            while(number == 0){
                try{
                    number = sc.nextInt();
                }
                catch (Exception e){
                    sc.next();
                    number = 0;
                    System.out.println("The input is not valid, please enter a number\n");
                    continue;
                }
                if(number <= 0){
                    number = 0;
                    System.out.println("The input is not valid, please enter a positive number\n");
                }
            }
            System.out.println("Please proceed with entering the information for the " + number + " lab sessions\n");
            for(int i = 0; i < number; i++){
                System.out.println("Please enter the ID of the " + ordinals[i] + " lab session");
                int id = -1;
                while(id == -1){
                    try{
                        id = sc.nextInt();
                    }
                    catch (Exception e){
                        sc.next();
                        id = -1;
                        System.out.println("The input is not valid, please enter a number\n");
                        continue;
                    }
                    if(labDic.containsKey(id)){
                        id = -1;
                        System.out.println("This lab ID has existed for the course " + name + ", please enter another ID");
                        continue;
                    }
                    if(id < 0){
                        id = -1;
                        System.out.println("The input is not valid, please enter a non-negative number\n");
                    }
                }
                System.out.println("Please enter the size of the " + ordinals[i] + " lab session");
                int size = 0;
                while(size == 0){
                    try{
                        size = sc.nextInt();
                    }
                    catch (Exception e){
                        sc.next();
                        size = 0;
                        System.out.println("The input is not valid, please enter a number\n");
                        continue;
                    }
                    if(size <= 0){
                        size = 0;
                        System.out.println("The input is not valid, please enter a positive number\n");
                    }
                }
                Lab current = new Lab(id, size);
                System.out.println("A lab session with ID " + id + " and size " + size + " has been created\n");
                labList.add(current);
                labDic.put(id, i);
            }
            System.out.println("All " + number + " lab sessions have been created\n");
        }
        Faculty currentFaculty = facultyList.get(allfaculties.get(ID));
        courseList.add(new Course(name, currentFaculty, lecture, tutorialList, labList, tutorialDic, labDic));
        allCourseCodes.put(name, courseCount);
        courseCount++;
        System.out.println("You've successfully added the course " + name + " with coordinator " + currentFaculty.getName() + " to the SCRAME System!");
        System.out.println();
        System.out.println("Below is the list of all courses, there are altogether " + courseList.size() + " courses in the system.");
        int count = 1;
        for(Course c:courseList){
            System.out.println("(" + count + ") Course Code: " + c.getName() + "  |  Course Coordinator: " + c.getFaculty().getName());
            count++;
        }
        System.out.println();
        pressAnyKeyToContinue();
    }

    /**
     * Prints course code and faculty who teaches the course of all courses in the system.
     * Since this is a private method. It will not be shown in the HTML file
     */
    private static void printCourse() {
        int count = 1;
        if (courseList.size() == 0) {
            System.out.println("There is not course in the system");
            pressAnyKeyToContinue();
            return;
        }
        System.out.println("Below is the list of all courses, there are altogether " + courseList.size() + " courses in the system.");
        for(Course c:courseList){
            System.out.println("(" + count + ") Course Code: " + c.getName() + "  |  Course Coordinator: " + c.getFaculty().getName() + " | Course Vacancy: " + c.getLecture().getVacancy());
            count++;
        }
        pressAnyKeyToContinue();
    }


    /**
     * Registers a student to a course(including registration of labs and tutorials) and store 'student-course' information in a record.
     * Since this is a private method. It will not be shown in the HTML file
     */
    private static void addStudentToCourse(){
        System.out.println("Please enter the Matriculation Number of the student");
        String matricNo = sc.next();
        if (!allMatricNos.containsKey(matricNo)){
            System.out.println("There's no student in the system with Matric Number " + matricNo + ", please check the correctness of the input\n");
            System.out.println();
            pressAnyKeyToContinue();
            return;
        }
        Student currentStudent = studentList.get(allMatricNos.get(matricNo));
        System.out.println("Please enter the Course Code of the course you want to register for " + currentStudent.getName());
        String courseCode = sc.next();
        if(!allCourseCodes.containsKey(courseCode)){
            System.out.println("The course " + courseCode + " doesn't exist in the system, please check the correctness of the input\n");
            System.out.println();
            pressAnyKeyToContinue();
            return;
        }
        if(currentStudent.checkRegistered(courseCode)){
            System.out.println("The student " + currentStudent.getName() + " has already been registered with the course " + courseCode + ".");
            System.out.println();
            pressAnyKeyToContinue();
            return;
        }
        Course currentCourse = courseList.get(allCourseCodes.get(courseCode));
        if (currentCourse.isFull()){
            System.out.println("The course " + courseCode + " has no vacancy left, please try another course");
            System.out.println();
            pressAnyKeyToContinue();
            return;
        }
        else{
            Record currentRecord = new Record(currentStudent, currentCourse);
            System.out.println("Here's the detail of the course " + courseCode + ": ");
            if(currentCourse.getTutorialNumber() == 0)
                System.out.println("This course only has Lecture.");
            else if(currentCourse.getLabNumber() == 0)
                System.out.println("This course only has Lecture and Tutorial.");
            else
                System.out.println("This course has Lecture, Tutorial and Lab.");
            System.out.println("Lecture: vacancy = " + currentCourse.getLecture().getVacancy());
            currentCourse.getLecture().registered();
            currentRecord.addSession(currentCourse.getLecture());
            if (currentCourse.getTutorialNumber() != 0){
                System.out.println("Enter the id of the tutorial group you want to register (only select a tutorial group that has vacancy): ");
                for (int i = 1; i <= currentCourse.getTutorialNumber(); i++){
                    System.out.println("Tutorial group " + currentCourse.getTutorial().get(i-1).getID() + "  |  vacancy: " + currentCourse.getTutorial().get(i-1).getVacancy() + " / " + currentCourse.getTutorial().get(i - 1).getSize());
                }
                int id = -1;
                while(id == -1){
                    try{
                        id = sc.nextInt();
                    }
                    catch (Exception e){
                        sc.next();
                        id = -1;
                        System.out.println("The input is not valid, please enter a number\n");
                        continue;
                    }
                    if(currentCourse.checkTutorial(id) == -1){
                        id = -1;
                        System.out.println("The entered id doesn't exist, please choose an id from the above list");
                    }
                    else if(currentCourse.getTutorial().get(currentCourse.checkTutorial(id)).isFull()){
                        id = -1;
                        System.out.println("The selected tutorial Group is full, please only select a tutorial group that has vacancy");
                    }
                }
                System.out.println("The student " + currentStudent.getName() + " has been registered with the tutorial group " + id);
                currentCourse.getTutorial().get(currentCourse.checkTutorial(id)).registered();
                currentRecord.addSession(currentCourse.getTutorial().get(currentCourse.checkTutorial(id)));
                if(currentCourse.getLabNumber() != 0){
                    System.out.println("Enter the id of the lab group you want to register (only select a lab group that has vacancy): ");
                    for (int i = 1; i <= currentCourse.getLabNumber(); i++){
                        System.out.println("Lab group " + currentCourse.getLab().get(i-1).getID() + "  |  vacancy: " + currentCourse.getLab().get(i-1).getVacancy() + " / " + currentCourse.getLab().get(i - 1).getSize());
                    }
                    id = -1;
                    while(id == -1){
                        try{
                            id = sc.nextInt();
                        }
                        catch (Exception e){
                            sc.next();
                            id = -1;
                            System.out.println("The input is not valid, please enter a number\n");
                            continue;
                        }
                        if(currentCourse.checkLab(id) == -1){
                            id = -1;
                            System.out.println("The entered id doesn't exist, please choose an id from the above list");
                        }
                        else if(currentCourse.getLab().get(currentCourse.checkLab(id)).isFull()){
                            id = -1;
                            System.out.println("The selected lab Group is full, please only select a lab group that has vacancy");
                        }
                    }
                    System.out.println("The student " + currentStudent.getName() + " has been registered with the lab group " + id);
                    currentCourse.getLab().get(currentCourse.checkLab(id)).registered();
                    currentRecord.addSession(currentCourse.getLab().get(currentCourse.checkLab(id)));
                }
            }
            currentCourse.addRecord(currentRecord);
            currentStudent.addRecord(currentRecord);
            System.out.print("Congratulations, the student " + currentStudent.getName() + " has been successfully registered with the course " + currentCourse.getName());
            if(currentRecord.getSessionList().size() > 1){
                System.out.print(" Tutorial Group " + currentRecord.getSessionList().get(1).getID());
            }
            if(currentRecord.getSessionList().size() > 2){
                System.out.print(" Lab Group " + currentRecord.getSessionList().get(2).getID());
            }
            System.out.println(".");
            System.out.println();
            pressAnyKeyToContinue();
        }

    }

    /**
     * Checks the vacancy of each lecture, lab and tutorial of a course.
     * Since this is a private method. It will not be shown in the HTML file
     */
    private static void checkVacancy(){
        System.out.println("Please enter the Course Code you want to check for vacancy");
        String courseCode = sc.next();
        if (!allCourseCodes.containsKey(courseCode)){
            System.out.println("The course " + courseCode + " doesn't exist in the system, please check the correctness of the input\n");
            return;
        }
        Course currentCourse = courseList.get(allCourseCodes.get(courseCode));
        System.out.println("Lecture vacancy = " + currentCourse.getLecture().getVacancy());
        System.out.println("This course has " + currentCourse.getTutorialNumber() + " tutorials and " + currentCourse.getLabNumber() + " labs.");
        for (int i = 1; i <= currentCourse.getTutorialNumber(); i++){
            System.out.println("Tutorial group " + i + ": id = " + currentCourse.getTutorial().get(i-1).getID() + " vacancy = " + currentCourse.getTutorial().get(i-1).getVacancy());
        }
        for (int j = 1; j <= currentCourse.getLabNumber(); j++){
            System.out.println("Lab group " + j + ": id = " + currentCourse.getLab().get(j-1).getID() + " vacancy = " + currentCourse.getLab().get(j-1).getVacancy());
        }
        System.out.println();
        pressAnyKeyToContinue();
        return; 
    }

    /**
     * Prints the list of students of a course by lecture, lab or tutorial.
     * Since this is a private method. It will not be shown in the HTML file
     */
    private static void printStudentList(){
    	String courseCode;
    	int choice = 0;
    	System.out.println("Please enter the Course code of the Course of which you want to print the student list:");

    	courseCode = sc.next();
    	if(!allCourseCodes.containsKey(courseCode)) {
            System.out.println("This Course Code does not exist in the system records, you can proceed with other operations\n");
            System.out.println();
            pressAnyKeyToContinue();
            return;
        }

        while(choice == 0){
            System.out.println("Please choose the sequence do you want to print the student list:");
            System.out.println("1.By lecture");
            System.out.println("2.By tutorial");
            System.out.println("3.By laboratory");
            try{
                    choice = sc.nextInt();
            }
            catch (Exception e){
                sc.next();
                choice = 0;
                System.out.println("The input is not valid, please enter 1 or 2 or 3\n");
                continue;
            }
            if(choice != 1 && choice !=2 && choice != 3){
                choice = 0;
                System.out.println("The input is not valid, please enter 1 or 2 or 3\n");
                continue;
            }
    	}
        Course currentCourse = courseList.get(allCourseCodes.get(courseCode));
    	if(currentCourse.getRecordList().size()==0){
    	    System.out.println("There is no student registered to this course.");
            System.out.println();
            pressAnyKeyToContinue();
    	    return;
    	}
        if(choice ==1){
            System.out.println("Name        "+"MatricNo  "+ "School  "+ "Gender");
    	    for(Student s:studentList){
    		    if(s.checkRegistered(courseCode)){
    		    	System.out.format("%-10s  %-8s  %-6s  %-10s\n", s.getName(), s.getMatricNo(), s.getSchool(), s.getGender());
    		    }
    		}
    	}
    	else if(choice ==2){
    		if(currentCourse.getTutorialNumber()==0){
    			System.out.println("There is no tutorial for this course.");
                System.out.println();
                pressAnyKeyToContinue();
    			return;
    		}
    		else{
    			System.out.println("Below is the list of tutorial IDs for this course:");
    			for(Tutorial t: currentCourse.getTutorial()){
    				System.out.println("Tutorial Group" + t.getID());
    			}
    			System.out.println("Please choose the ID of the tutorial you want to print");
    			int id = -1;
                while(id == -1){
                    try{
                        id = sc.nextInt();
                    }
                    catch (Exception e){
                        sc.next();
                        id = -1;
                        System.out.println("The input is not valid, please enter a number\n");
                        continue;
                    }
                    if(currentCourse.checkTutorial(id) == -1){
                    	id = -1;
                        System.out.println("The tutorial session does not exist, please enter a valid tutorial session.\n");
                        continue;
                    }
                }
                if(currentCourse.getTutorial().get(currentCourse.checkTutorial(id)).isEmpty()){
                    System.out.println("There is no student registered to this tutorial session.");
                    System.out.println();
                    pressAnyKeyToContinue();
                    return;
                }

    	    	System.out.println("Name        "+"MatricNo  "+ "School "+ "Gender");
                for(Record r: currentCourse.getRecordList()){
    		            int len = r.getSessionList().size();
    		            for(int i = 0; i < len; i++){
    		                Session se = (Session)r.getSessionList().get(i);
    		                if(se instanceof Tutorial)
    		                   if(se.getID() == id)
                                   System.out.format("%-10s  %-8s  %-6s  %-10s\n", r.getStudent().getName(), r.getStudent().getMatricNo(), r.getStudent().getSchool(), r.getStudent().getGender());}
                }

    		}
    	}
        else if(choice ==3){
            if(currentCourse.getLabNumber()==0){
                System.out.println("There is no lab for this course.");
                System.out.println();
                pressAnyKeyToContinue();
                return;
            }
            else{
                System.out.println("Below is the list of lab IDs for this course:");
                for(Lab l: currentCourse.getLab()){
                    System.out.println("Lab Group" + l.getID());
                }
                System.out.println("Please choose the ID of the lab you want to print");
                int id = -1;
                while(id == -1){
                    try{
                        id = sc.nextInt();
                    }
                    catch (Exception e){
                        sc.next();
                        id = -1;
                        System.out.println("The input is not valid, please enter a number\n");
                        continue;
                    }
                    if(currentCourse.checkLab(id) == -1){
                        id = -1;
                        System.out.println("The lab session does not exist, please enter a valid lab session.\n");
                        continue;

                    }
                }
                if(currentCourse.getLab().get(currentCourse.checkLab(id)).isEmpty()){
                    System.out.println("There is no student registered to this lab session.");
                    return;
                }

                System.out.println("Name        "+"MatricNo  "+ "School "+ " Gender");
                    for(Record r: currentCourse.getRecordList()){
                        int len = r.getSessionList().size();
                        for(int i = 0; i < len; i++){
                            Session se = (Session)r.getSessionList().get(i);
                            if(se instanceof Lab)
                                if(se.getID() == id)
                                    System.out.format("%-10s  %-8s  %-6s  %-10s\n", r.getStudent().getName(), r.getStudent().getMatricNo(), r.getStudent().getSchool(), r.getStudent().getGender());}
                    }
            }
    	}
        System.out.println();
        pressAnyKeyToContinue();
    }


    /**
     * Records the weightage of each component of a course (including coursework and exam).
     * Since this is a private method. It will not be shown in the HTML file
     */
    private static void enterAssessmentWeightage(){
        double exam_weightage = 0;
        int numOfCAs = -1;
        int input;
        String name;
        double percent = 0;
        CA ca;
        Course course;
        Component component;


        course = getCourse();

        System.out.println("Please enter the weightage (%) of the exam (0-100)");
        while (exam_weightage == 0) {
            try {
                input = sc.nextInt();
                exam_weightage = (double)input / 100;
            }
            catch (Exception e) {
                sc.next();
                exam_weightage = 0;
                System.out.println("The input is not valid, please enter an integer between 0 and 100\n");
                continue;
            }
            if (input > 100 || input < 0) {
                exam_weightage = 0;
                System.out.println("The input is not valid, please enter an integer between 0 and 100\n");
            }
        }

        System.out.println("Please enter the number of CAs");
        while (numOfCAs == -1) {
            try {
                numOfCAs = sc.nextInt();
            }
            catch (Exception e) {
                sc.next();
                numOfCAs = -1;
                System.out.println("The input is not valid, please enter an positive integer");
                continue;
            }
            if (numOfCAs == 0){
                numOfCAs = -1;
                System.out.println("The input is not valid, please enter an integer greater than 0");
            }
        }
        component = new Component(exam_weightage, numOfCAs);
        ca = component.getCa();
        for (int i = 0; i < numOfCAs; i++) {
            System.out.println("Enter name for CA(" + (i+1) + ")");
            sc.nextLine();
            name = sc.nextLine();
            ca.setName(name, i);
            if (i == numOfCAs-1) {
                percent = 1 - percent;
                System.out.println("The weightage of " + name + " is set automatically");
            }
            else {
                System.out.println("Enter weightage of " + name + " in all CAs");
                while (percent == 0) {
                    try {
                        percent = sc.nextInt();
                        percent /= 100;
                    }
                    catch (Exception e) {
                        sc.next();
                        percent = 0;
                        System.out.println("The input is not valid, please enter a integer between 0 and 100\n");
                        continue;
                    }
                    if (percent > 1 || percent < 0) {
                        percent = 0;
                        System.out.println("The input is not valid, please enter a integer between 0 and 100\n");
                    }
                }
            }

            ca.setWeightage(percent, i);
        }
        course.setComponent(component);

        component.printComponents();

        System.out.println();
        pressAnyKeyToContinue();
    }

    /**
     * Gets coursework mark of a course for a specific student(inclusive of its component).
     * Since this is a private method. It will not be shown in the HTML file
     */
    private static void enterCourseWorkMark(){
        ArrayList<Record> records;
        Student student;
        student = getStudent();
        if (student == null)
            return;
        String courseCode;
        int idx;
        Course course;


        records = student.getRecordList();
        if (records.size() == 0) {
            System.out.println("Student " + student.getName() + " hasn't been registered into any course");
            pressAnyKeyToContinue();
            return;
        }
        boolean valid = true;


        System.out.println("Please enter the Course Code of the course you want to enter course work mark");
        courseCode = sc.next();
        if(!allCourseCodes.containsKey(courseCode)) {
            System.out.println("This Course Code does not exist in the system records, you can proceed with other operations\n");
            System.out.println();
            pressAnyKeyToContinue();
            return;
        }
        idx = allCourseCodes.get(courseCode);
        course = courseList.get(idx);
        if(!student.checkRegistered(courseCode)){
            valid = false;
            System.out.println("Student " + student.getName() + " hasn't been registered to " + courseCode);
        }
        while (!valid) {
            System.out.println("Please enter the Course Code of the course you want to enter course work mark");
            courseCode = sc.next();
            if(!allCourseCodes.containsKey(courseCode)){
                System.out.println("The course " + courseCode + " doesn't exist in the system, please check the correctness of the input\n");
                continue;
            }
            valid = true;

        }


        if (!course.hasComponent()) {
            System.out.println("Please enter the assessment components for the course " + courseList.get(idx).getName() + " first.");
            System.out.println();
            pressAnyKeyToContinue();
            return;
        }
        for (Record record : records) {
            if (record.getCourse().getName().equals(courseCode)) {
                record.setCaMarks(sc);
                record.printCaMarks();
                break;
            }

        }
        System.out.println();
        pressAnyKeyToContinue();

    }

    /**
     * Gets exam mark of a course for a specific student.
     * Since this is a private method. It will not be shown in the HTML file
     */
    private static void enterExamMark(){
        ArrayList<Record> records;
        Student student;
        student = getStudent();
        if (student == null)
            return;
        String courseCode;
        int idx;
        Course course;


        records = student.getRecordList();
        if (records.size() == 0) {
            System.out.println("Student " + student.getName() + " hasn't been registered into any course");
            pressAnyKeyToContinue();
            return;
        }

        boolean valid = true;

        System.out.println("Please enter the Course Code of the course you want to enter course work mark");
        courseCode = sc.next();
        if(!allCourseCodes.containsKey(courseCode)){
            System.out.println("The course " + courseCode + " doesn't exist in the system, please check the correctness of the input\n");
            System.out.println();
            pressAnyKeyToContinue();
            return;
        }
        idx = allCourseCodes.get(courseCode);
        course = courseList.get(idx);

        if(!student.checkRegistered(courseCode)){
            valid = false;
            System.out.println("The student hasn't been registered to the course " + courseCode + ", please check the correctness of the input\n");
        }
        while (!valid) {
            System.out.println("Please enter the Course Code of the course you want to enter course work mark");
            courseCode = sc.next();
            if(!allCourseCodes.containsKey(courseCode)){
                System.out.println("The course " + courseCode + " doesn't exist in the system, please check the correctness of the input\n");
                continue;
            }
            valid = true;

        }
        if(!course.hasComponent()){
            System.out.println("Please enter the assessment components for the course " + courseList.get(idx).getName() + " first.");
            System.out.println();
            pressAnyKeyToContinue();
            return;
        }

        for (Record record : records) {
            if (record.getCourse().getName().equals(courseCode)) {
                record.setExamMark(sc);
                record.printExamMark();
                break;
            }

        }
        System.out.println();
        pressAnyKeyToContinue();

    }

    /**
     * Shows grade percentage for overall
     * (exam + coursework,exam only and coursework only)
     * Since this is a private method. It will not be shown in the HTML file
     */
    private static void printCourseStatistic(){
        if(courseList.isEmpty()){
            System.out.println("There's no course in the System, please add a course first");
            System.out.println();
            pressAnyKeyToContinue();
            return;
        }
        int idx = -1;
        while (idx == -1) {
            System.out.println("Please enter the course code of the course you want to check");
            String courseCode;
            courseCode = sc.next();
            if(!allCourseCodes.containsKey(courseCode)){
                System.out.println("The course " + courseCode + " doesn't exist in the system, please check the correctness of the input\n");
                System.out.println();
            }
            else{
                idx = allCourseCodes.get(courseCode);
            }
        }
        Course currentCourse = courseList.get(idx);
        if(!currentCourse.hasComponent()){
            System.out.println("Please enter the assessment components for the course " + courseList.get(idx).getName() + " first.");
            System.out.println();
            pressAnyKeyToContinue();
            return;
        }
        double overallavg = 0;
        int numOfCAs = currentCourse.getComponent().getNumOfCAs();
        double examavg = 0;
        double[] caavg = new double[numOfCAs];
        int count = 0;
        for(int i = 0; i < currentCourse.getRecordList().size(); i++){
            Record currentRecord = currentCourse.getRecordList().get(i);
            if(currentRecord.hasMark()){
                count++;
                examavg += currentRecord.getExamMark();
                overallavg += currentRecord.getOverallMark();
                for(int j = 0; j < numOfCAs; j++){
                    caavg[j] += currentRecord.getMark()[j];
                }
            }
        }
        if(count == 0){
            System.out.println("There's no student grade record for this course.");
        }
        else{
            if(count == 1){
                System.out.println("There are altogether " + count + " record found, the average marks over all records are shown below");
            }
            else{
                System.out.println("There are altogether " + count + " records found, the average marks over all records are shown below");
            }
            System.out.println("--------------------------------------------");
            System.out.format("%-20s | %-8s | %s\n", "Component", "Grade", "Weightage");
            System.out.format("%-20s | %-4.2f/100 | %s\n", "Overall grade", overallavg/count, "100%");
            System.out.format("%-20s | %-4.2f/100 | %d%%\n", "Exam", examavg / count, Math.round(currentCourse.getComponent().getExamWeightage() * 100));
            for(int j = 0; j < numOfCAs; j++){
                System.out.format("%-20s | %-4.2f/100 | %d%%\n", currentCourse.getComponent().getCa().getName(j), caavg[j] / count, Math.round(100 * currentCourse.getComponent().getCa().getWeightage(j)));
            }
        }
        System.out.println();
        pressAnyKeyToContinue();
    }

    /**
     * Shows results for all courses registered by a student,
     * inclusive of the overall course mark and individual component marks.
     * Since this is a private method. It will not be shown in the HTML file
     */
    private static void printStudentTranscript(){
        Student student = getStudent();
        try {
            student.printTranscript();
        } catch (NullPointerException e) {
            System.out.println("");
        }

        pressAnyKeyToContinue();
    }

    /**
     * A helper function that reads a course code (String),
     * perform input checking and returns a Course object.
     * @return a Course object based on the user input
     * Since this is a private method. It will not be shown in the HTML file
     */
    private static Course getCourse() {
        if (courseList.size() == 0) {
            System.out.println("There is no course in the system");
            System.out.println();
            pressAnyKeyToContinue();
            return null;
        }
        System.out.println("Enter the course code of the course you want to edit");
        String courseCode;
        int idx;
        Course course;
        while (true) {
            courseCode = sc.next();
            try {
                idx = allCourseCodes.get(courseCode);
            }
            catch (Exception e) {
                System.out.println("the course you are looking for is not valid, please enter a valid course code");
                continue;
            }
            break;
        }
        course = courseList.get(idx);
        return course;
    }

    /**
     * A helper function that reads a student's matric Number,
     * perform input checking and returns a Student object.
     * @return a Student object based on the user input
     * Since this is a private method. It will not be shown in the HTML file
     */
    private static Student getStudent() {
        if (studentList.size() == 0) {
            System.out.println("There is no student in the system");
            System.out.println();
            pressAnyKeyToContinue();
            return null;
        }
        System.out.println("Enter the matric number of the student you want to find");
        String matricNo;
        int idx;
        Student student;
        while (true) {
            matricNo = sc.next();
            try {
                idx = allMatricNos.get(matricNo);
            }
            catch (Exception e) {
                System.out.println("the student you are looking for is not present, please enter a valid matric number");
                continue;
            }
            break;
        }
        student = studentList.get(idx);
        return student;
    }

    /**
     * A helper function that waits for any user action,
     * used to pause the program
     * Since this is a private method. It will not be shown in the HTML file
     */
    private static void pressAnyKeyToContinue()
    {
        System.out.println("Press Enter key to continue...");
        try
        {
            sc.nextLine();
            sc.nextLine();
        }
        catch(Exception e)
        {}
    }

    /**
     * A helper function that performs serialization,
     * saves object to binary files
     * @param outPath the path of the object to be serialized
     * @param o Any object.
     * Since this is a private method. It will not be shown in the HTML file
     */
    private static void saveObject(Object o, String outPath) {
        try {
            FileOutputStream fileOut = new FileOutputStream(outPath);
            ObjectOutputStream out = new ObjectOutputStream(fileOut);
            out.writeObject(o);
            out.close();
            fileOut.close();
            System.out.println("Serialized data is saved in " + outPath);
        } catch (IOException i) {
        }

    }

    /**
     * A helper function that reads any object and return it,
     * Type casting is not done
     * @param inPath the path from which we read object
     * @return an Object or null
     * Since this is a private method. It will not be shown in the HTML file
     */
    private static Object readObject(String inPath) {
        try {
            FileInputStream fileIn = new FileInputStream(inPath);
            ObjectInputStream in = new ObjectInputStream(fileIn);
            Object object = in.readObject();
            in.close();
            fileIn.close();
            return object;
        } catch (IOException i) {
            return null;
        } catch (ClassNotFoundException c) {
            System.out.println("Class not found");
            return null;
        }
    }
}