import java.util.*;

import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Paths;

// This class is Admin. in this class admin will provide username and password to Lecturer,Students and new admins

public class Admin {

public static void main(String[] args) throws IOException {

// for user input...

Scanner input = new Scanner(System.in);

System.out.println("Please choose which information you want to Enter");

System.out.println("1.Enter Lecturers username and password");

System.out.println("2.Enter Students username and password");

System.out.println("3.Enter Admins username and password");

int number = input.nextInt(); // for choosing which user need to add into the system..

while (number != 4) {

// helps for select...

switch (number) {

// case 1 pointing lecturers...

case 1:

LinkedList lec_list = readLecturerFromFile();

System.out.println("How many lecturer Information you want to input");

int value1 = input.nextInt();

if (true) {

for (int i = 0; i < value1; i++) {

System.out.println("Input Lecturer username ");

String name = input.next();

System.out.println("Input Lecturer password");

String password = input.next();

lec_list.add(new Lecturer(name, password)); // helped to add username and password.

System.out.println("Save lecturers to file...");

saveLecturerToFile(lec_list);

}

System.out.println("All lecturers account");

LinkedList lecturers = readLecturerFromFile();

for (int i = 0; i < lecturers.size(); i++)

System.out.println(lecturers.get(i));

System.out.println();

break;

}

case 2:

LinkedList Stu_list = readStudentsFromFile();

System.out.println("How many students username and password you want to input?");

int value2 = input.nextInt();

for (int i = 0; i < value2; i++) {

System.out.println("Input Students Username" );

String name = input.next();

System.out.println("Input Students Password");

String password = input.next();

Stu_list.add(new Students(name, password));// helped to add username and password

System.out.println("Save lecturers to file...");

saveStudentsToFile(Stu_list);

}

System.out.println("All students account");

LinkedList students = readStudentsFromFile();

for (int i = 0; i < students.size(); i++)

System.out.println(students.get(i));

System.out.println();

break;

case 3:

LinkedList nadmin = readAdminFromFile();

System.out.println("How many NewAdmins username and password you want to input?");

int value3 = input.nextInt();

for (int i = 0; i < value3; i++) {

System.out.println("Input Admins Username");

String name = input.next();

System.out.println("Input Admins Password");

String password = input.next();

nadmin.add(new NewAdmins(name, password));

System.out.println("Save admins to file...");

saveAdminToFile(nadmin);

}

System.out.println("All admins account");

LinkedList nadmins = readAdminFromFile();

for (int i = 0; i < nadmins.size(); i++)

System.out.println(nadmins.get(i));

System.out.println();

break;

case 4:

System.out.println("Thank you see you soon");

}

System.out.println();

System.out.println("Please choose which information you want to Enter");

System.out.println("1.Enter Lecturers username and password");

System.out.println("2.Enter Students username and password");

System.out.println("3.Enter Admins username and password");

System.out.println("To exit, press 4");

number = input.nextInt();

}

System.out.println("Exit confirm Thank you ");

}

private static LinkedList readLecturerFromFile() throws IOException {

LinkedList lecturers = new LinkedList<>();

List lines = Files.readAllLines(Paths.get("lecturer.csv"));

for (int i = 0; i < lines.size(); i++) {

String[] items = lines.get(i).split(" ");

lecturers.add(new Lecturer(items[0], items[1]));

}

return lecturers;

}

private static void saveLecturerToFile(LinkedList lecturers) throws IOException {

StringBuilder sb = new StringBuilder();

for (int i = 0; i < lecturers.size(); i++)

sb.append(lecturers.get(i).toCSVString() + " ");

Files.write(Paths.get("lecturer.csv"), sb.toString().getBytes());

}

private static LinkedList readStudentsFromFile() throws IOException {

LinkedList students = new LinkedList<>();

// read students.csv into a list of lines.

List lines = Files.readAllLines(Paths.get("student.csv"));

for (int i = 0; i < lines.size(); i++) {

String[] items = lines.get(i).split(" ");

students.add(new Students(items[0], items[1]));

}

return students;

}

private static void saveStudentsToFile(LinkedList students) throws IOException {

StringBuilder sb = new StringBuilder();

for (int i = 0; i < students.size(); i++)

sb.append(students.get(i).toCSVString() + " ");

Files.write(Paths.get("student.csv"), sb.toString().getBytes());

}

private static LinkedList readAdminFromFile() throws IOException {

LinkedList nadmin = new LinkedList<>();

List lines = Files.readAllLines(Paths.get("admin.csv"));

for (int i = 0; i < lines.size(); i++) {

String[] items = lines.get(i).split(" ");

nadmin.add(new NewAdmins(items[0], items[1]));

}

return nadmin;

}

private static void saveAdminToFile(LinkedList nadmin) throws IOException {

StringBuilder sb = new StringBuilder();

for (int i = 0; i < nadmin.size(); i++)

sb.append(nadmin.get(i).toCSVString() + " ");

Files.write(Paths.get("admin.csv"), sb.toString().getBytes());

}

}

This is my code can you add these requiremets: 1. Admin can add new projects must be user input and show into the program and save it into the csv file. 2. Admin can delete those projects those saved information delete from csv file 3. Admin can leave comments all the projects and comment will show beside those project in csv file After that can you convert the whole code in GUI so that the code run properly. i need only code no explanaition..