prohlížeč souborů PROG 14.03.

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

public class Menu extends JFrame {
    private JPanel mainPanel;
    private JMenu menuFile;
    private JMenuItem miOpenFile;

    public Menu(){
        initComponents();
    }
    private void initComponents(){
        setContentPane(mainPanel);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JMenuBar menuBar = new JMenuBar();
        setJMenuBar(menuBar);
        menuFile = new JMenu("File");
        menuFile.setMnemonic(KeyEvent.VK_F);
        menuBar.add(menuFile);
        miOpenFile = new JMenuItem("Open...", KeyEvent.VK_0);
        menuFile.add(miOpenFile);
        miOpenFile.addActionListener(e -> openFile());
    }
    private void openFile(){
        JFileChooser fc = new JFileChooser();
        fc.showOpenDialog(this);
    }
    public static void main(String[] args) {
        Menu g = new Menu();
        g.pack();
        g.setVisible(true);

    }
}