File Editor

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import java.awt.Toolkit;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;
import java.io.*;

public class Main extends JFrame {

	private JPanel contentPane;
	private JTextField textFieldFile;
	private JTextArea textArea;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					Main frame = new Main();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public Main() {
		setIconImage(Toolkit.getDefaultToolkit().getImage(Main.class.getResource("/javax/swing/plaf/metal/icons/ocean/question.png")));
		setTitle("Java Application");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 476, 333);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);

		JLabel label = new JLabel("\u0423\u043A\u0430\u0436\u0438\u0442\u0435 \u043F\u0443\u0442\u044C \u043A \u0444\u0430\u0439\u043B\u0443:");
		label.setBounds(10, 11, 120, 14);
		contentPane.add(label);

		textFieldFile = new JTextField();
		textFieldFile.setBounds(140, 8, 310, 20);
		contentPane.add(textFieldFile);
		textFieldFile.setColumns(10);

		JButton buttonNew = new JButton("\u0421\u043E\u0437\u0434\u0430\u0442\u044C \u043D\u043E\u0432\u044B\u0439");
		buttonNew.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String fileName = textFieldFile.getText().trim();

				if (fileName.isEmpty()) {
					JOptionPane.showMessageDialog(null, "Enter file path!", "Error", 0);
				} else {
					File newFile = new File(fileName);

					try {
						newFile.createNewFile();
						JOptionPane.showMessageDialog(null, "File created!", "Message", 1);
					} catch (IOException ex) {
						JOptionPane.showMessageDialog(null, "File don't create!", "Error!", 0);
					}
				}
			}
		});
		buttonNew.setBounds(10, 36, 120, 23);
		contentPane.add(buttonNew);

		JButton buttonDelete = new JButton("\u0423\u0434\u0430\u043B\u0438\u0442\u044C");
		buttonDelete.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String fileName = textFieldFile.getText().trim();

				if (fileName.isEmpty()) {
					JOptionPane.showMessageDialog(null, "Enter file path!", "Error", 0);
				} else {
					File deleteFile = new File(fileName);

					if (deleteFile.exists()) {
						deleteFile.delete();
						JOptionPane.showMessageDialog(null, "File deleted", "Message", 1);
					} else {
						JOptionPane.showMessageDialog(null, "File don't exist", "Error", 0);
					}
				}
			}
		});
		buttonDelete.setBounds(10, 70, 120, 23);
		contentPane.add(buttonDelete);

		JButton buttonRename = new JButton("\u041F\u0435\u0440\u0435\u0438\u043C\u0435\u043D\u043E\u0432\u0430\u0442\u044C");
		buttonRename.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String fileName = textFieldFile.getText().trim();

				if (fileName.isEmpty()) {
					JOptionPane.showMessageDialog(null, "Enter file path!", "Error", 0);
				} else {
					File renameFile = new File(fileName);
					if (renameFile.exists()) {
						String newName = JOptionPane.showInputDialog("Enter new name:");

						if (newName == null)
							newName = "";

						if (!newName.trim().isEmpty()) {
							File newFile = new File(renameFile.getParent() + "\\" + newName);
							renameFile.renameTo(newFile);
							JOptionPane.showMessageDialog(null, "File renamed!", "Message", 1);
						}
					} else {
						JOptionPane.showMessageDialog(null, "File don't find!", "Error!", 0);
					}
				}
			}
		});
		buttonRename.setBounds(10, 104, 120, 23);
		contentPane.add(buttonRename);

		JButton buttonRead = new JButton("\u041F\u0440\u043E\u0447\u0438\u0442\u0430\u0442\u044C");
		buttonRead.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String fileName = textFieldFile.getText().trim();

				if (fileName.isEmpty()) {
					JOptionPane.showMessageDialog(null, "Enter file path!", "Error", 0);
				} else {
					File file = new File(fileName);

					if (file.exists()) {
						try {
							InputStream fileStream = new FileInputStream(fileName);
							BufferedReader input = new BufferedReader(new InputStreamReader(fileStream));

							String result  = "";
							while (input.ready()) {
								result += input.readLine() + "\n";
							}

							textArea.setText(result);
							input.close();
							fileStream.close();
						} catch (IOException ex) {
							JOptionPane.showMessageDialog(null, "Whatever not work...", "Error!", 0);
							System.exit(0);
						}
					} else {
						JOptionPane.showMessageDialog(null, "File don't find!", "Error!", 0);
					}
				}
			}
		});
		buttonRead.setBounds(10, 138, 120, 23);
		contentPane.add(buttonRead);

		JButton buttonWrite = new JButton("\u0417\u0430\u043F\u0438\u0441\u0430\u0442\u044C");
		buttonWrite.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String fileName = textFieldFile.getText().trim();

				if (fileName.isEmpty()) {
					JOptionPane.showMessageDialog(null, "Enter file path!", "Error!", 0);
				} else {
					File file = new File(fileName);

					if (file.exists()) {
						try {
							OutputStream fileStream = new FileOutputStream(fileName);
							BufferedWriter output = new BufferedWriter(new OutputStreamWriter(fileStream));
							output.write(textArea.getText());
							output.close();
							fileStream.close();
							JOptionPane.showMessageDialog(null, "Write in you file!", "Message!", 1);
						} catch (IOException ex) {
							JOptionPane.showMessageDialog(null, "Whatever not work...", "Error!", 0);
							System.exit(0);
						}
					} else {
						JOptionPane.showMessageDialog(null, "Couldn't found file!", "Error", 0);
					}
				}
			}
		});
		buttonWrite.setBounds(10, 172, 120, 23);
		contentPane.add(buttonWrite);

		JScrollPane scrollPane = new JScrollPane();
		scrollPane.setBounds(140, 39, 310, 244);
		contentPane.add(scrollPane);

		textArea = new JTextArea();
		scrollPane.setViewportView(textArea);
	}
}