Java Act 3

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class act_3 {
    public static boolean isAlphabet(String input) {
        Pattern pattern = Pattern.compile("[\\d-!$%^&#*()_+|~=`{}\\[\\]:\";'<>?,.\\/]");
        Matcher matcher = pattern.matcher(input);
        if (matcher.find()) {
            return false;
        }
        return true;
    }
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        // boolean flag to check if we are still repeating
        boolean repeat = true;

        while(repeat) {
            System.out.print("How many students: ");
            int numOfStudents = input.nextInt();

            // Array that will hold the values of each students
            String studentName[] = new String[numOfStudents];
            String studentNumber[] = new String[numOfStudents];
            String course[] = new String[numOfStudents];
            double midTermGrade[] = new double[numOfStudents];

            // this consumes the nextLine that nextInt doesn't, which fixes the new line spacing bug
            input.nextLine();

            for (int i = 0; i < numOfStudents; i++) {
                System.out.println("Student " + (i+1));
                // boolean flags again to check if the requirements are met
                boolean validName = false;
                boolean validCourse = false;
                boolean validGrade = false;

                while(!validName) {
                    System.out.print("Enter Student Name: ");
                    studentName[i] = input.nextLine();
                    if (isAlphabet(studentName[i])) {
                        validName = true;
                    }
                    else {
                        System.out.println("Wrong input Alphabet characters only. Please try again");
                    }
                }
                System.out.print("Enter Student #: ");
                studentNumber[i] = input.nextLine();
                while(!validCourse) {
                    System.out.print("Enter Course: ");
                    course[i] = input.nextLine();
                    if (isAlphabet(course[i])) {
                        validCourse = true;
                    }
                    else {
                        System.out.println("Wrong input Alphabet characters only. Please try again");
                    }
                }
                while(!validGrade) {
                    System.out.print("Enter Mid Term Grade: ");
                    midTermGrade[i] = input.nextDouble();
                    if (midTermGrade[i] >= 50 && midTermGrade[i] <= 100) {
                        validGrade = true;
                    }
                    else {
                        System.out.println("Wrong input Please input 50-100 only. Please try again");
                    }
                }
                input.nextLine();
                System.out.println();
            }

            // Loop for displaying all Students
            for (int i = 0; i < numOfStudents; i++) {
                System.out.println("Student " + (i+1));
                System.out.println("Student Name: " + studentName[i]);
                System.out.println("Student #: " + studentNumber[i]);
                System.out.println("Course: " + course[i]);
                System.out.println("Mid Term Grade: " + midTermGrade[i]);
                System.out.println();
                // Rating - to be added
                // Remarks - to be added
            }

            System.out.print("Do you like to try again Y/N: ");
            String askToRepeat = input.nextLine();
            if (askToRepeat.equalsIgnoreCase("Y") || askToRepeat.equalsIgnoreCase("Yes")) {
                repeat = true;
            }
            else if (askToRepeat.equalsIgnoreCase("N") || askToRepeat.equalsIgnoreCase("No")) {
                repeat = false;
                System.out.println("Program exiting now...");
            }
        }
    }
}