Question

Design and implement a program to allow a college administrator to register new students and
add courses to the existing one. In addition, your program should allow the administrator to do
the following:
• Add/Remove a new student
• Add/Remove a course to/from a selected student
• Search for a student either by last name or by id.
• Search for a course either by name or by id.
• Display a selected student along with the courses s/he is registered for.
• List all registered students along with the courses each student is registered for.

Using java

Answer 1

/*************************************Student.java**************************/

package student7;

import java.util.ArrayList;

public class Student {

   private String id;
   private String name;
   private ArrayList<Course> courses;

   public Student() {
       this.id = "";
       this.name = "";
       this.courses = new ArrayList<>();
   }

   public Student(String id, String name) {
       super();
       this.id = id;
       this.name = name;
       this.courses = new ArrayList<>();
   }

   public String getId() {
       return id;
   }

   public void setId(String id) {
       this.id = id;
   }

   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }

   public void addCourse(Course course) {

       courses.add(course);
   }

  
   public ArrayList<Course> getCourses() {
       return courses;
   }

   @Override
   public String toString() {
       return "Student " + id + ", " + name + ", courses: " + courses;
   }
  
}
/*****************************Course.java******************************/

package student7;

public class Course {

   private String id;
   private String name;
  
   public Course() {
      
       this.id = "";
       this.name = "";
   }

   public Course(String id, String name) {
       super();
       this.id = id;
       this.name = name;
   }

   public String getId() {
       return id;
   }

   public void setId(String id) {
       this.id = id;
   }

   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }

   @Override
   public String toString() {
       return "Course "+ id + ", " + name;
   }
  
  
}
/***************************************Admin.java**********************/

package student7;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.Scanner;

public class Admin {

   static ArrayList<Student> students;
   static ArrayList<Course> courses;

   public static void main(String[] args) {

       students = new ArrayList<>();
       courses = new ArrayList<>();
       Scanner scan = new Scanner(System.in);
       int choice = 0;
       do {

           menu();
           System.out.print("Please select any choice: ");
           choice = scan.nextInt();
           switch (choice) {
           case 1:
               addStudent();
               break;
           case 2:
               removeStudent();
               break;
           case 3:
               addCourse();
               break;
           case 4:
               removeCourse();
               break;
           case 5:
               searchStudentById();
               break;
           case 6:
               searchStudentByName();
               break;
           case 7:
               searchCourseById();
               break;
           case 8:
               searchCourseByName();
               break;
           case 9:
               displaySelectedStudent();
               break;
           case 10:
               displayListOfStudent();
               break;
           case 11:
               System.out.println("Thank you, Bye!");
               break;
           default:
               System.out.println("Invalid Choice!");
               break;
           }

       } while (choice != 11);
   }

   private static void addStudent() {

       Scanner scan = new Scanner(System.in);
       System.out.print("Enter Student id: ");
       String id = scan.nextLine();
       System.out.print("Enter Student name: ");
       String name = scan.nextLine();
       students.add(new Student(id, name));
   }

   private static void removeStudent() {

       Scanner scan = new Scanner(System.in);
       System.out.print("Enter Student id: ");
       String id = scan.nextLine();
       int flag = 0;
       Iterator<Student> itr = students.iterator();
       while (itr.hasNext()) {

           Student student = itr.next();
           if (student.getId().equalsIgnoreCase(id)) {

               itr.remove();
               flag = 1;
           }
       }
       if (flag == 0) {

           System.out.println("No Student found!");
       }
   }

   private static void addCourse() {

       Scanner scan = new Scanner(System.in);
       System.out.print("Enter Student id: ");
       String id = scan.nextLine();
       int flag = 0;
       for (Student student : students) {

           if (student.getId().equalsIgnoreCase(id)) {

               System.out.print("Enter Course id: ");
               String idCourse = scan.nextLine();
               System.out.print("Enter Course name: ");
               String name = scan.nextLine();
               student.addCourse(new Course(idCourse, name));
               courses.add(new Course(idCourse, name));
               flag = 1;
           }
       }
       if (flag == 0) {

           System.out.println("No Student found!");
       }

   }

   private static void removeCourse() {

       Scanner scan = new Scanner(System.in);
       System.out.print("Enter Student id: ");
       String id = scan.nextLine();
       int flag = 0;
       for (Student student : students) {

           if (student.getId().equalsIgnoreCase(id)) {

               System.out.print("Enter Course id: ");
               String idCourse = scan.nextLine();
               Iterator<Course> itr = student.getCourses().iterator();
               while (itr.hasNext()) {

                   Course course = itr.next();
                   if (course.getId().equalsIgnoreCase(idCourse)) {

                       itr.remove();
                       flag = 1;
                   }
               }
           }
       }
       if (flag == 0) {

           System.out.println("No Course found!");
       }
   }

   private static void searchStudentById() {

       Scanner scan = new Scanner(System.in);
       System.out.print("Enter Student id: ");
       String id = scan.nextLine();
       int flag = 0;
       for (Student student : students) {

           if (student.getId().equalsIgnoreCase(id)) {

               System.out.println(student.getId() + ", " + student.getName());
               flag = 1;
           }
       }
       if (flag == 0) {

           System.out.println("No Student Found by this id!");
       }
   }

   private static void searchStudentByName() {

       Scanner scan = new Scanner(System.in);
       System.out.print("Enter Student name: ");
       String name = scan.nextLine();
       int flag = 0;
       for (Student student : students) {

           if (student.getName().equalsIgnoreCase(name)) {

               System.out.println(student.getId() + ", " + student.getName());
               flag = 1;
           }
       }
       if (flag == 0) {

           System.out.println("No Student Found by this id!");
       }

   }

   private static void searchCourseById() {

       Scanner scan = new Scanner(System.in);
       System.out.print("Enter Course id: ");
       String id = scan.nextLine();
       int flag = 0;
       for (Course course : courses) {

           if (course.getId().equalsIgnoreCase(id)) {

               System.out.println(course.toString());
               flag = 1;
           }
       }
       if (flag == 0) {

           System.out.println("No Course Found!");
       }

   }

   private static void searchCourseByName() {

       Scanner scan = new Scanner(System.in);
       System.out.print("Enter Course name: ");
       String name = scan.nextLine();
       int flag = 0;
       for (Course course : courses) {

           if (course.getName().equalsIgnoreCase(name)) {

               System.out.println(course.toString());
               flag = 1;
           }
       }
       if (flag == 0) {

           System.out.println("No Course Found!");
       }
   }

   private static void displaySelectedStudent() {

       Scanner scan = new Scanner(System.in);
       System.out.print("Enter Student id: ");
       String id = scan.nextLine();
       int flag = 0;
       for (Student student : students) {

           if (student.getId().equalsIgnoreCase(id)) {

               System.out.println(student.toString());
               flag = 1;
           }
       }
       if (flag == 0) {

           System.out.println("No Student Found by this id!");
       }
   }

   private static void displayListOfStudent() {

       Scanner scan = new Scanner(System.in);
       System.out.print("Enter Course name: ");
       String name = scan.nextLine();
       int flag = 0;
       for (Student student : students) {

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

               if (student.getCourses().get(i).getName().equalsIgnoreCase(name)) {

                   System.out.println(student.toString());
               }
           }
           if (flag == 0) {

               System.out.println("No Student found!");
           }
       }

   }

   private static void menu() {

       System.out.println("1. Add a Student\n" + "2. Remove a Student\n" + "3. Add a Course to Student\n"
               + "4. Remove a Course from Student\n" + "5. Search Student by id\n" + "6. Search Student by name\n"
               + "7. Search Course by id\n" + "8. Search Course by name\n" + "9. Display a selected Student\n"
               + "10. List Student with registered Course\n" + "11. Exit");
   }
}
/***************************output*******************************/

1. Add a Student
2. Remove a Student
3. Add a Course to Student
4. Remove a Course from Student
5. Search Student by id
6. Search Student by name
7. Search Course by id
8. Search Course by name
9. Display a selected Student
10. List Student with registered Course
11. Exit
Please select any choice: 1
Enter Student id: 101
Enter Student name: Virat
1. Add a Student
2. Remove a Student
3. Add a Course to Student
4. Remove a Course from Student
5. Search Student by id
6. Search Student by name
7. Search Course by id
8. Search Course by name
9. Display a selected Student
10. List Student with registered Course
11. Exit
Please select any choice: 3
Enter Student id: 101
Enter Course id: CSE101
Enter Course name: C Programming
1. Add a Student
2. Remove a Student
3. Add a Course to Student
4. Remove a Course from Student
5. Search Student by id
6. Search Student by name
7. Search Course by id
8. Search Course by name
9. Display a selected Student
10. List Student with registered Course
11. Exit
Please select any choice: 5
Enter Student id: 101
101, Virat
1. Add a Student
2. Remove a Student
3. Add a Course to Student
4. Remove a Course from Student
5. Search Student by id
6. Search Student by name
7. Search Course by id
8. Search Course by name
9. Display a selected Student
10. List Student with registered Course
11. Exit
Please select any choice: 6
Enter Student name: Virat
101, Virat
1. Add a Student
2. Remove a Student
3. Add a Course to Student
4. Remove a Course from Student
5. Search Student by id
6. Search Student by name
7. Search Course by id
8. Search Course by name
9. Display a selected Student
10. List Student with registered Course
11. Exit
Please select any choice: 7
Enter Course id: CSE101
Course CSE101, C Programming
1. Add a Student
2. Remove a Student
3. Add a Course to Student
4. Remove a Course from Student
5. Search Student by id
6. Search Student by name
7. Search Course by id
8. Search Course by name
9. Display a selected Student
10. List Student with registered Course
11. Exit
Please select any choice: 8
Enter Course name: C Programming
Course CSE101, C Programming
1. Add a Student
2. Remove a Student
3. Add a Course to Student
4. Remove a Course from Student
5. Search Student by id
6. Search Student by name
7. Search Course by id
8. Search Course by name
9. Display a selected Student
10. List Student with registered Course
11. Exit
Please select any choice: 9
Enter Student id: 101
Student 101, Virat, courses: [Course CSE101, C Programming]
1. Add a Student
2. Remove a Student
3. Add a Course to Student
4. Remove a Course from Student
5. Search Student by id
6. Search Student by name
7. Search Course by id
8. Search Course by name
9. Display a selected Student
10. List Student with registered Course
11. Exit
Please select any choice: 10
Enter Course name: C Programming
Student 101, Virat, courses: [Course CSE101, C Programming]
No Student found!
1. Add a Student
2. Remove a Student
3. Add a Course to Student
4. Remove a Course from Student
5. Search Student by id
6. Search Student by name
7. Search Course by id
8. Search Course by name
9. Display a selected Student
10. List Student with registered Course
11. Exit
Please select any choice: 11
Thank you, Bye!

Please let me know if you have any doubt or modify the answer, Thanks :)