setDisabledIcon

import java.awt.FlowLayout;
import java.awt.Toolkit;
import java.awt.event.KeyEvent;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.KeyStroke;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
/**
 *
 * @author Anh-Kool
 */
public class Notepad {

    public static void main(String[] args) {
        JFrame frame = new JFrame("Hoang Anh");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new FlowLayout());
        JMenuBar jmb = new JMenuBar();
        frame.setJMenuBar(jmb);

        JMenu file = new JMenu("File");
        file.setMnemonic(KeyEvent.VK_F);
        jmb.add(file);

        JMenu edit = new JMenu("Edit");
        edit.setMnemonic(KeyEvent.VK_E);
        jmb.add(edit);

        JMenu format = new JMenu("Format");
        format.setMnemonic(KeyEvent.VK_O);
        jmb.add(format);

        JMenu view = new JMenu("View");
        view.setMnemonic(KeyEvent.VK_V);
        jmb.add(view);

        JMenu help = new JMenu("Help");
        help.setMnemonic(KeyEvent.VK_H);
        jmb.add(help);

        JMenuItem f_new = new JMenuItem("New");
        f_new.setMnemonic(KeyEvent.VK_N);
        file.add(f_new);
        file.addSeparator();

        JMenuItem open = new JMenuItem("Open");
        open.setMnemonic(KeyEvent.VK_O);
        int mask = Toolkit.getDefaultToolkit().getMenuShortcutKeyMask();
        open.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V, mask));
        file.add(open);
        file.addSeparator();

        JMenuItem save = new JMenuItem("Save");
        save.setMnemonic(KeyEvent.VK_S);
        save.setEnabled(false);//k hien thi, k dung dc
        file.add(save);

        JButton button = new JButton("A");
        button.setDisabledIcon(new ImageIcon("Jellyfish.jpg"));
        button.setRolloverIcon(new ImageIcon("Jellyfish.jpg"));
        frame.add(button);

        frame.setSize(300, 270);
        frame.setVisible(true);
        frame.setResizable(false);
        frame.setLocation(600, 300);


    }
}