How do i save data to a word doc in java?

I need some help, I am trying to find a way to save all data inputed by the user.

I would like to save it into a txt file or better yet a database.

I have posted my code below, thank you guys for any assitance you can provide :).

    import java.util.*;
    import javax.swing.*;
    public class AoCGuildRegister {
        Scanner sc = new Scanner(System.in);
        String aocUsername = "";
        String aocDiscord = "";
        String aocFirstName = "";
        int aocAge = 0;
        String aocGender = "";
        String aocFinal = "";

        public static void main(String[] args) {
            Scanner sc = new Scanner(System.in); //System.in is a standard input stream

            String aocUsername = JOptionPane.showInputDialog(null, "Enter your username");
            if (aocUsername == null) {
                JOptionPane.showMessageDialog(null, "You did not enter your username");
            } else {
                JOptionPane.showMessageDialog(null, "Your user name is : " + aocUsername);
            }

            boolean result = Boolean.parseBoolean(aocUsername);
            String aocDiscord = JOptionPane.showInputDialog(null, "Enter your Discord username");
            if (aocDiscord == null) {
                JOptionPane.showMessageDialog(null, "You did not enter your a Discord username");
            } else {
                JOptionPane.showMessageDialog(null, "Your Discord username is : " + aocDiscord);
            }

            String aocFirstName = JOptionPane.showInputDialog(null, "Enter your firstname");
            if (aocFirstName == null) {
                JOptionPane.showMessageDialog(null, "You did not enter your firstname");
            } else {
                JOptionPane.showMessageDialog(null, "Your firstname is : " + aocFirstName);
            }

            String aocAge = JOptionPane.showInputDialog(null, "Enter your age");
            if (aocAge == null) {
                JOptionPane.showMessageDialog(null, "You did not enter your age");
            } else {
                JOptionPane.showMessageDialog(null, "You are " + aocAge + " years old");
            }

            String aocGender = JOptionPane.showInputDialog(null, "Enter your gender");
            if (aocGender == null) {
                JOptionPane.showMessageDialog(null, "You did not enter your gender");
            } else {
                JOptionPane.showMessageDialog(null, "You are : " + aocGender);
            }
            JOptionPane.showMessageDialog(null, "Thank you for signing up to the AoC Guild");
        }