Notepad

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Scanner;
import java.io.*;

public class Notepad extends JFrame implements ActionListener {
  private TextArea textArea = new TextArea("", 0,0, TextArea.SCROLLBARS_VERTICAL_ONLY);
  // membuat menu bar
  private MenuBar menuBar = new MenuBar();
    private Menu file = new Menu(); // menubar file
    private MenuItem newfile = new MenuItem(); //program new
    private MenuItem openFile = new MenuItem(); // program open
    private MenuItem saveFile = new MenuItem(); // program save
    private MenuItem close = new MenuItem(); // program close


    public Notepad() {
        this.setSize(500, 300); //setting ukuran dari windownya
        this.setTitle("Java Notepad Sederhana"); //nama program text editor
        setDefaultCloseOperation(EXIT_ON_CLOSE); //mengatur pengaturan default close untuk exit
        this.textArea.setFont(new Font("Century Gothic", Font.BOLD, 12)); //penentuan font

        this.getContentPane().setLayout(new BorderLayout());
        this.getContentPane().add(textArea);

        //menampulkan menubar pada GUI
        this.setMenuBar(this.menuBar);
        this.menuBar.add(this.file);
        this.file.setLabel("File");


        this.newfile.setLabel("New");
        this.newfile.addActionListener(this);
        this.newfile.setShortcut(new MenuShortcut(KeyEvent.VK_N, false));
        this.file.add(this.newfile);


        this.openFile.setLabel("Open"); //menentukan tablenya
        this.openFile.addActionListener(this); //untuk responsif
        this.openFile.setShortcut(new MenuShortcut(KeyEvent.VK_O, false)); //setting keyboard shortcut
        this.file.add(this.openFile); // tambahkan ke menu "File"


        this.saveFile.setLabel("Save");
        this.saveFile.addActionListener(this);
        this.saveFile.setShortcut(new MenuShortcut(KeyEvent.VK_S, false));
        this.file.add(this.saveFile);


        this.close.setLabel("Close");
        this.close.setShortcut(new MenuShortcut(KeyEvent.VK_F4, false));
        this.close.addActionListener(this);
        this.file.add(this.close);
    }

    public void actionPerformed (ActionEvent e) {
        //opsi close
        if (e.getSource() == this.close)
            this.dispose(); //menutup program

        //opsi open
        else if (e.getSource() == this.openFile) {
            JFileChooser open = new JFileChooser(); //membuka file dari browser file
            int option = open.showOpenDialog(this); //verifikasi
            // open dialog untuk memverifikasi kemuan user
            if (option == JFileChooser.APPROVE_OPTION) {
                this.textArea.setText(""); //membersihkan text area
                try {
                    //scanner untuk read filenya
                    Scanner scan = new Scanner(new FileReader(open.getSelectedFile().getPath()));
                    while (scan.hasNext()) // while masih ada yg diread
                        this.textArea.append(scan.nextLine() + "\n"); //tampilkan di text area
                } catch (Exception ex) {
                    System.out.println(ex.getMessage());
                }
            }
        }

        //opsi save
        else if (e.getSource() == this.saveFile) {
            JFileChooser save = new JFileChooser(); //pilih file
            int option = save.showSaveDialog(this); //verifikasi
            if (option == JFileChooser.APPROVE_OPTION) {
                try {
                    //buffered writer
                    BufferedWriter out = new BufferedWriter(new FileWriter(save.getSelectedFile().getPath()));
                    out.write(this.textArea.getText()); //save
                    out.close();
                } catch (Exception ex) {
                    System.out.println(ex.getMessage());
                }
            }
        }

        else if (e.getSource() == this.newfile) {
            textArea.setText(" ");
        }
    }

   // membuat notepad dan menampilkan program
    public static void main(String args[]) {
        Notepad app = new Notepad();
        app.setVisible(true);
    }
}