TempProgram.java

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

public class FileManager {
    private JTextArea textArea;

    public FileManager(JTextArea textArea) {
        this.textArea = textArea;
    }

    // Open file
    public void openFile() {
        JFileChooser fileChooser = new JFileChooser();
        int result = fileChooser.showOpenDialog(null);
        if (result == JFileChooser.APPROVE_OPTION) {
            File file = fileChooser.getSelectedFile();
            try (BufferedReader reader = new BufferedReader(new FileReader(file))) {
                StringBuilder content = new StringBuilder();
                String line;
                while ((line = reader.readLine()) != null) {
                    content.append(line).append("\n");
                }
                textArea.setText(content.toString());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    // Save file
    public void saveFile() {
        JFileChooser fileChooser = new JFileChooser();
        int result = fileChooser.showSaveDialog(null);
        if (result == JFileChooser.APPROVE_OPTION) {
            File file = fileChooser.getSelectedFile();
            try (BufferedWriter writer = new BufferedWriter(new FileWriter(file))) {
                writer.write(textArea.getText());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    // Close file
    public void closeFile() {
        textArea.setText("");
    }
}