Registration.java

package se115.master;
import javax.swing.*;
import javax.swing.border.LineBorder;
import javax.swing.border.TitledBorder;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedWriter;
import java.io.FileWriter;

public class Registration {

    private JFrame frame = new JFrame("IUE");
    private String nameSurname = "null";
    private String number = "00000000000";
    private String department = "null";
    private JPanel content;
    private boolean isDone = true;

    /**
     * Getter and Setter methods
     */
    public boolean isDone() {
        return isDone;
    }

    public void setDone(boolean done) {
        isDone = done;
    }

    public String getNameSurname() {
        return nameSurname;
    }

    public String getNumber() {
        return number;
    }

    public String getDepartment() {
        return department;
    }

    /**
     * Adding panel with next page button
     */
    public void setContent() {

        content = new JPanel();
        content.setLayout(null);
        content.setBorder(new TitledBorder(new LineBorder(Color.MAGENTA,5), ""));
        JButton saveBtn = new JButton("Save Information");
        saveBtn.setBounds(50,35,200,100);
        saveBtn.addActionListener(new SaveBtnListener());
        content.add(saveBtn);

    }

    /**
     * Getting information from user
     */
    public void inputNameSurname() {
        nameSurname = JOptionPane.showInputDialog(null,"Name and Surname","Info"
                , JOptionPane.QUESTION_MESSAGE);
    }
    public void inputNumber() {
        number = JOptionPane.showInputDialog(null,"School Number","Info"
                , JOptionPane.QUESTION_MESSAGE);
    }
    public void inputDepartment() {
        department = JOptionPane.showInputDialog(null,"Department","Info"
                , JOptionPane.QUESTION_MESSAGE);
    }

    /**
     * Creating a frame that contains next button
     */
    public void setRegisterFrame() {

        frame.setTitle("IEU");
        frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
        frame.setSize(300,200);
        frame.setLocationRelativeTo(null);
        frame.add(content);
        frame.setResizable(false);
        frame.setVisible(true);
    }

    /**
     * write information to users.txt file
     */
    private void setDataBase() {
        String fullInfo = nameSurname + "/" + number + "/" + department;
        try {
            FileWriter fileWriter = new FileWriter("users.txt");
            BufferedWriter writer = new BufferedWriter(fileWriter);
            writer.write(fullInfo);
            writer.close();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    /**
     * Inner class which provides actionPerformed method for Save Information button
     */
    private class SaveBtnListener implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent e) {
            frame.setVisible(false);
            setDataBase();
            MainPanel main = new MainPanel();
            main.setFrame();
            main.setInfo(nameSurname, number, department);
        }
    }
}