import java.io.*;//Provides for system input and output through data streams
import javax.swing.JOptionPane;//Imports Dialog box in program
public class VowelsConsonants
{
    public static void main (String[] args)
    {
        int choice, again;
        choice = JOptionPane.showConfirmDialog (null, "Would you like to play the Vowel/Consonant game?, Please Choose Yes, No, or Cancel!");//user decides wether to play game                                            
        String letter = " ";//ables user to input a letter
            if (choice == JOptionPane.YES_OPTION)//user plays the game if he/she chooses the "Yes" option.
            {
                do
                {
                    letter = JOptionPane.showInputDialog ("Please enter a letter from A-Z: ");//user enters a letter from a-z
                    if (letter.equalsIgnoreCase("a") || letter.equalsIgnoreCase("e") || letter.equalsIgnoreCase("i") || letter.equalsIgnoreCase("o") || letter.equalsIgnoreCase("u"))//tells the program the vowels, so it can decide if its a vowel or consonant
                    {
                        JOptionPane.showMessageDialog (null, "You have entered a vowel.");//tells the user whether he/she entered a vowel or not
                    }
                    else if (letter.equalsIgnoreCase("b") || letter.equalsIgnoreCase("c") || letter.equalsIgnoreCase("d") || letter.equalsIgnoreCase("f") || letter.equalsIgnoreCase("g") || letter.equalsIgnoreCase("h") || letter.equalsIgnoreCase("j") || letter.equalsIgnoreCase("k") || letter.equalsIgnoreCase("l") || letter.equalsIgnoreCase("m") || letter.equalsIgnoreCase("n") || letter.equalsIgnoreCase("o") || letter.equalsIgnoreCase("q") || letter.equalsIgnoreCase("r") || letter.equalsIgnoreCase("s") || letter.equalsIgnoreCase("t") || letter.equalsIgnoreCase("v") || letter.equalsIgnoreCase("w") || letter.equalsIgnoreCase("x") || letter.equalsIgnoreCase("y") || letter.equalsIgnoreCase("z"))
                    {
                        JOptionPane.showMessageDialog (null, "You have entered a consonant.");//tells the user whether he/she entered a consonant or not
                    }
                    else
                    {
                        JOptionPane.showMessageDialog (null, "Error: Invalid Input, No Symbols, Numbers, or Spaces Please");
                    }            
                    again = JOptionPane.showConfirmDialog (null, "Would you like to try again? ");//ask user if he/she wants to try again
                }while (again == JOptionPane.YES_OPTION);//user plays the game until they choose "No" or "Cancel"
            }
    }
}            

import javax.swing.JOptionPane;//Imports Dialog box in program

public class VowelsConsonants
{
    public static void main (String[] args)
    {
        int choice, again = 0;
        char[] voyel = {'a', 'e', 'i', 'o', 'u'};
        char[] consonant = {'b', 'c', 'd', 'f', 'g','h','j','k','l','m','n','p','q','r','s','t','v','w','x','y','z'};
        choice = JOptionPane.showConfirmDialog (null, "Would you like to play the Vowel/Consonant game?, Please Choose Yes, No, or Cancel!");//user decides wether to play game                                            
        char letter;
        if (choice == JOptionPane.YES_OPTION)//user plays the game if he/she chooses the "Yes" option.
        {
            do
            {
                boolean typeFound = false;
                String str = JOptionPane.showInputDialog ("Please enter a letter from A-Z: ");//user enters a letter from a-z
                str = str.toLowerCase();
                letter = str.charAt(0);
                for(int i = 0; i < voyel.length; i++) {
                    if(letter == voyel[i]) {
                        JOptionPane.showMessageDialog (null, "You have entered a vowel.");//tells the user whether he/she entered a vowel or not
                        typeFound = true;
                        break;
                    }
                }
                // OK was a vowel
                if(typeFound)
                    continue;

                for(int i = 0; i < consonant.length; i++) {
                    if(letter == consonant[i]) {
                        JOptionPane.showMessageDialog (null, "You have entered a consonant.");//tells the user whether he/she entered a consonant or not
                        typeFound = true;
                        break;
                    }
                }
                // OK was a consonant
                if(typeFound)
                    continue;
                JOptionPane.showMessageDialog (null, "Error: Invalid Input, No Symbols, Numbers, or Spaces Please");

                again = JOptionPane.showConfirmDialog (null, "Would you like to try again? ");//ask user if he/she wants to try again
            }while (again == JOptionPane.YES_OPTION);//user plays the game until they choose "No" or "Cancel"
        }
    }
}