☕ Java FOR PHC BOT #2 explain the process on how this code work

[PHC-Shade]

import java.util.Scanner; import java.time.LocalDate; import java.time.format.DateTimeFormatter; import java.util.ArrayList; import java.util.Arrays; import java.util.InputMismatchException; import java.util.Random; class Students { String name; int age; String address; String courseIntended; double gpa; int score; public Students(String name, int age, String address, String courseIntended, double gpa, int score) { this.name = name; this.age = age; this.address = address; this.courseIntended = courseIntended; this.gpa = gpa; this.score = score; } } public class CollegeAdmissionSystem { public ArrayList<Students> students = new ArrayList<>(); String[] courses = {"BSCS", "BSIT", "BSIS", "BSEMC"}; int[] reqscore = {65, 70, 75, 80}; Scanner input = new Scanner(System.in); String info, answer; private static final double REQUIRED_GPA = 93.0; public  CollegeAdmissionSystem() { System.out.println("| Thank you for Checking on Biglang Gwapo University |"); System.out.println("Here are the offered Courses: " + Arrays.toString(courses)); try { Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } do { System.out.print("Would you like to register? (Yes or No): "); answer = input.nextLine().trim().toLowerCase(); System.out.println("----------------------------"); switch (answer) { case "yes": studentReg(); break; case "no": System.out.println("Thank you! Have a great day!"); break; default: System.out.println("Invalid input. Please enter Yes or No."); } } while (!answer.equals("yes") && !answer.equals("no")); input.close(); } public void studentReg() { info = "Required Info: Name, Age, Address, Course Intended, and GPA"; boolean detailsCorrect = false; while (!detailsCorrect) { System.out.println(info); System.out.println("----------------------------"); System.out.print("Name: "); String name = input.nextLine(); String ci = ""; int age = 0; boolean validAge = false; while (!validAge) { System.out.print("Age: "); if (input.hasNextInt()) { age = input.nextInt(); if (age < 15 || age > 100) { System.out.println("Invalid Age Range. Please enter an age between 15 and 100."); } else { validAge = true; } } else { System.out.println("Please enter a valid Age."); } input.nextLine(); } System.out.print("Address: "); String address = input.nextLine(); boolean validCourse = false; while (!validCourse) { System.out.print("Course Intended: "); ci = input.nextLine().toUpperCase(); for (String course : courses) { if (ci.equalsIgnoreCase(course)) { validCourse = true; break; } } if (!validCourse) { System.out.println("Invalid Course Input. Please select from the offered courses."); } } double gpa; while (true) { System.out.print("GPA: "); if (input.hasNextDouble()) { gpa = input.nextDouble(); if (gpa < 0 || gpa > 100) { System.out.println("Please enter a GPA between 0 and 100."); continue; } break;                 } else { System.out.println("Enter a valid GPA."); input.nextLine(); } } input.nextLine(); System.out.println("----------------------------"); System.out.println("Please double-check your details:"); System.out.printf("Name: %s\nAge: %d\nAddress: %s\nCourse Intended: %s\nGPA: %.2f\n", name, age, address, ci, gpa); System.out.print("Are the information correct? (Yes or No): "); String response = input.nextLine().trim(); if (response.equalsIgnoreCase("Yes")) { detailsCorrect = true; students.add(new Students(name, age, address, ci, gpa, 0)); System.out.println("----------------------------"); System.out.println("Thanks for applying. Please wait while we verify your details..."); try { Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println("----------------------------"); if (gpa >= REQUIRED_GPA) { System.out.println("Congratulations! You are eligible to take the entrance exam."); Schedule(); } else { System.out.println("Thank you for applying. Unfortunately, your GPA does not meet the required 93. We wish you the best in your future endeavors."); } } else { System.out.println("Please re-enter your details."); } } } public void Schedule() { int year = 2024; int month = 4; int score = -1; Random random = new Random(); DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd"); System.out.println("University Admission Process"); System.out.println("----------------------------\n"); boolean satisfied = false; while (!satisfied) { System.out.println("Scheduling your exam."); try { Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } int day = random.nextInt(30) + 1; LocalDate randomDate = LocalDate.of(year, month, day); String formattedDate = randomDate.format(formatter); System.out.println("Your Exam Date is " + formattedDate); System.out.print("Are you satisfied with your scheduled date? (Yes or No): "); String answer = input.nextLine(); if (answer.equalsIgnoreCase("Yes")) { satisfied = true; } else { System.out.println("Scheduling a new exam date\n"); System.out.println("----------------------------\n"); } } while (true) { System.out.print("Step 2: Input your exam score:"); try { score = input.nextInt(); if (score < 0 || score > 100 ) { System.out.println("Input valid score "); continue; } break; } catch (InputMismatchException e) { System.out.println("Invalid input. Please enter a valid number score."); input.next(); } } if (!students.isEmpty()) { students.get(students.size() - 1).score = score; } else { System.out.println("No student details found to update the score."); } try { Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println("----------------------------\n"); if (score>60) { System.out.println("Congratulations! You are qualified to be admitted to the University."); Course(); }else { System.out.println("Sorry your score did not qualify to be admitted to this University"); } } public void Course() { if (students.isEmpty()) { System.out.println("No student details found to determine course qualification."); return; } Students lastStudent = students.get(students.size() - 1); String desiredCourse = lastStudent.courseIntended; int score = lastStudent.score; int courseIndex = -1; for (int i = 0; i < courses.length; i++) { if (desiredCourse.equalsIgnoreCase(courses[i])) { courseIndex = i; break; } } boolean isQualified = score >= reqscore[courseIndex]; if (isQualified) { System.out.println("You are qualified for the course"); System.out.println("You have successfully chosen: " + desiredCourse); Subjects(); } else { System.out.println("You are not qualified for the desired course."); System.out.println("Please choose another course."); input.nextLine(); String otherCourse = input.nextLine(); System.out.println("You have successfully chosen: " + otherCourse); } } public void displayStudents() { for(Students student : students){ System.out.printf( "Name: %s\nAge: %d\nAddress: %s\nCourse Intended: %s\nGPA: %.2f\nScore: %d\n", student.name, student.age, student.address, student.courseIntended, student.gpa, student.score); } } public void Subjects() { String[] subjects = {"Math", "History", "CC10", "CC11", "Philosophy", "Theology", "NSTP", "PE"}; ArrayList<String> enrolledSubjects = new ArrayList<>(); System.out.println("----------------------------"); boolean showSubjects = true; while (true) { if (showSubjects) { System.out.println("Here are the offered Subjects"); System.out.println("----------------------------\n"); for (int i = 0; i < subjects.length; i++) { System.out.println("[" + (i + 1) + "] " + subjects[i]); } System.out.println("----------------------------\n"); } System.out.print("Do you want to Add, Remove Subjects or Exit (Type: Add, Remove, Exit): "); String response = input.nextLine(); if (response.equalsIgnoreCase("Add")) { addSubjects(subjects, enrolledSubjects, input); showSubjects = false; } else if (response.equalsIgnoreCase("Remove")) { removeSubjects(subjects, enrolledSubjects, input); showSubjects = false; } else if (response.equalsIgnoreCase("Exit")) { break; } else { System.out.println("Invalid option. Please try again."); } } System.out.println("You are currently enrolled in: " + enrolledSubjects); input.close(); } private static void addSubjects(String[] subjects, ArrayList<String> enrolledSubjects, Scanner input) { System.out.print("Enter the number of the subject you want to add: "); try { int subjectNumber = input.nextInt(); input.nextLine(); if (subjectNumber > 0 && subjectNumber <= subjects.length) { String subjectToAdd = subjects[subjectNumber - 1]; if (!enrolledSubjects.contains(subjectToAdd)) { enrolledSubjects.add(subjectToAdd); System.out.println(subjectToAdd + " has been added."); } else { System.out.println("You are already enrolled in " + subjectToAdd); } } else { System.out.println("Invalid subject number."); } } catch (Exception e) { System.out.println("Please enter a valid number."); input.nextLine(); } } private static void removeSubjects(String[] subjects, ArrayList<String> enrolledSubjects, Scanner input) { if (enrolledSubjects.isEmpty()) { System.out.println("You are not currently enrolled in any subjects."); return; } System.out.println("Here are your currently enrolled Subjects:"); for (int i = 0; i < enrolledSubjects.size(); i++) { System.out.println("[" +(i + 1) + "] " + enrolledSubjects.get(i)); } System.out.print("Enter the number of the subject you want to remove: "); try { int subjectNumber = input.nextInt(); input.nextLine(); if (subjectNumber > 0 && subjectNumber <= enrolledSubjects.size()) { String subjectToRemove = enrolledSubjects.remove(subjectNumber - 1); System.out.println(subjectToRemove + " has been removed."); } else { System.out.println("Invalid subject number."); } } catch (Exception e) { System.out.println("Please enter a valid number."); input.nextLine(); } } public static void main(String[] args) { new CollegeAdmissionSystem(); } }

 

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The provided Java code is a simulation of a college admission system for an institution named "Biglang Gwapo University." The program handles various functionalities such as student registration, GPA verification, entrance exam scheduling, and course enrollment. Below, I'll explain the process and flow of the code in detail:

### Class Declarations

• Students: This class is used to store information about students. Each student has attributes like name, age, address, intended course, GPA, and exam score.
• CollegeAdmissionSystem: This class encompasses the main logic for the admission system, including student registration, exam scheduling, and course enrollment processes.

### Main Components of CollegeAdmissionSystem

#### Constructor

• The constructor initiates the admission process by displaying a welcome message and the courses offered.
• It asks the user if they want to register. Based on the user's response (yes or no), the program either proceeds to registration (studentReg()) or ends.

#### Student Registration (studentReg())

• Prompts the user to enter details such as name, age, address, intended course, and GPA.
• Validates each input (e.g., age must be between 15 and 100, GPA must be between 0 and 100, and the course must be one of the offered courses).
• Once all details are entered and confirmed by the user, the student's data is stored in an ArrayList of Students.
• If the GPA is 93.0 or above, the student is eligible to take the entrance exam (Schedule() method). Otherwise, the registration ends with a message.

#### Exam Scheduling (Schedule())

• Generates a random exam date within April 2024.
• Asks the user if they are satisfied with the date. If not, a new date is generated.
• Once the date is confirmed, the user is prompted to enter their exam score. The score is validated to be between 0 and 100.
• Depending on the score, the student may either qualify for admission or be rejected. If qualified, the program proceeds to course qualification (Course()).

#### Course Qualification (Course())

• Checks if the student's score meets the requirement for their desired course (stored in reqscore).
• If qualified, the student can proceed to enroll in subjects (Subjects()). Otherwise, they are asked to choose another course.

#### Subject Enrollment (Subjects())

• Displays a list of subjects and allows the student to add or remove subjects from their enrollment list using addSubjects() and removeSubjects().
• Continues until the student decides to exit the subject enrollment session.

#### Helper Methods (addSubjects(), removeSubjects())

• addSubjects(): Adds a selected subject to the student's list if it's not already enrolled.
• removeSubjects(): Removes a selected subject from the student's list.

### Main Method (main())
- The main() method simply creates an instance of CollegeAdmissionSystem, which triggers the constructor and starts the program.

### Execution Flow
1. Start the program.
2. Decide whether to register.
3. If registered, input and validate student details.
4. If eligible, schedule the exam and enter the score.
5. Based on the score, proceed to course qualification.
6. Enroll in subjects.
7. Exit the program.

This simulation handles various real-world scenarios such as input validation, user decision-making processes, and conditional progression based on criteria like GPA and exam scores.