Account Creator

package luke.idk;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.Random;

import javax.swing.JOptionPane;

/**
 *
 * @author Luke
 * @version 1.00
 * Details: Creates an account choosing a random username and
 *          password and stores details into a txt file for later use.
 *
 */

public class AccountCreator {

    /**
     * Account log in details
     */
    private static String username = "";
    private static String password = "";

    /**
     * Number of accounts to make
     */
    private static String selection = JOptionPane.showInputDialog("How many accounts would you like created?");
    private static int amount = Integer.valueOf(selection);

    /**
     * Alphabet for assigning characters to the log in details
     */
    private static char[] alphabet = "abcdefghijklmnopqrstuvwxyz".toCharArray();

    /**
     * Array List for phrases to spam
     */
    private static String[] phrases = {"Your server is shit!", "CancerScape!", "Go fuck yourselves!", "Je moeder heeft kanker"};
    private static List<String> message = Arrays.asList(phrases);

    /**
     * Main method for executing the programme
     */
    public static void main(String[] args) throws IOException {
        int count = 0;
        for (int i = 0; i < amount; i++) {
            createUser(5);
            createPassword(5);
            login(username, password);
            logout();
            logDetails(username, password);
            System.out.println("Accounts created: " + ++count);
            System.out.println("----------------------------------------------------------------");
            username = "";
            password = "";
        }
    }

    /**
     * False login method for testing purposes
     */
    private static void login(String username, String password) {
        System.out.println("Username: " + username + " - " + "Password: " + password);
        System.out.println("Message sent: " + message.get(new Random().nextInt(message.size())));
    }

    /**
     * False log out method for testing purposes
     */
    private static void logout() {
        System.out.println("Logged out of account: " + username);
    }

    /**
     * Method for creating the username
     */
    private static void createUser(int length) {
        for (int i = 0; i < length; i++) {
            username += alphabet[new Random().nextInt(alphabet.length - 1)];
        }
    }

    /**
     * Method for creating the password
     */
    private static void createPassword(int length) {
        for (int i = 0; i < length; i++) {
            password += alphabet[new Random().nextInt(alphabet.length - 1)];
        }
    }

    /**
     * Method for writing account details to txt file.
     */
    private static void logDetails(String username, String password) throws IOException {
        String details = username + " " + password;
        System.out.println("Logging details: " + details);
        BufferedWriter fw2 = new BufferedWriter(new FileWriter(("accounts.txt"), true));
        fw2.write(details);
        fw2.newLine();
        fw2.close();
    }
}