Program membuat file dengan bahasa JAVA

berikut code Membuat file dengan bahasa JAVA

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.io.*;

class BuatFile extends JFrame implements ActionListener

{

                private JTextArea output;

                private JButton btnHasil, btnTutup;

   

    public BuatFile(){

                                JPanel panel_1=new JPanel();

                                panel_1.setLayout(new FlowLayout());

        panel_1.add(btnHasil=new JButton("Simpan"));

        panel_1.add(btnTutup=new JButton("Tutup"));

                                JScrollPane scroll = new JScrollPane(output=new JTextArea());

        output.setFont(new Font("Arial",0,14));

                                output.setLineWrap(true);

                                output.setWrapStyleWord(true);

                                scroll.setPreferredSize(new Dimension(300, 100));

                                JPanel panel_2=new JPanel();

                                panel_2.setLayout(new BorderLayout());

                                panel_2.add(scroll);

                                setLayout(new BorderLayout());

                                add(panel_2,"Center");

                                add(panel_1,"South");

                   

                                btnHasil.addActionListener(this);

        btnTutup.addActionListener(this);                      

                }

                public void actionPerformed(ActionEvent e){

    

                   if(e.getSource()==btnHasil){

              String hasil=output.getText();

              DataOutputStream simpanFile=null;

                                   try{

                                     simpanFile=new DataOutputStream(new FileOutputStream("TYO.txt"));        

                                     simpanFile.writeBytes(hasil);

             simpanFile.close();

                                   }catch(IOException ex){

                                                   JOptionPane.showMessageDialog(null,"Error--"+ex.toString(),"Warning",

                                                                   JOptionPane.ERROR_MESSAGE);

                                   }

                 JOptionPane.showMessageDialog(null,"Data berhasil disimpan pada file 'TYO.txt' ","Simpan",

                                                 JOptionPane.INFORMATION_MESSAGE);

                   }

      

                   if(e.getSource()==btnTutup){

                                   JOptionPane.showMessageDialog(null,"--- Terima kasih ---\n     by : Raditya Pratama Putra",

                                                   "Thank you", JOptionPane.INFORMATION_MESSAGE);

       System.exit(0);

                   }

                }

    public static void main(String[] args){       

        BuatFile frame = new BuatFile();

                                frame.pack();

                                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                                frame.setTitle("Notepad Sederhana by Raditya Pratama Putra");

                                frame.setVisible(true);

                               

    }

}