如何向JMenuItem添加快捷方式（助记符）

Question

I have an 'about' JMenuItem that when clicked displays a text box of what the application does. I'd like the user to be able to access this via a shortcut (mnemonic). This is my current code. (I have already tried numerous times I just thought it would be better to post the code with no errors).

 JMenuItem item2 = new JMenuItem("About", new ImageIcon("aboutIcon.gif"));
    m1.add(item2);

    item2.addActionListener(new ActionListener()  {


        public void actionPerformed(ActionEvent arg0) {

            JOptionPane.showMessageDialog(null, "This application converts numerous values"
                    + " of different formats"
                    + " inputted by the user, and displays the desired "
                    + "result.\n Author: James Cordiner"
                    + "\n© Copyright");

        }

    });

Answer 1

You are asking about an accelerator. Use
item2.setAccelerator(KeyStroke.getKeyStroke( KeyEvent.VK_A, ActionEvent.ALT_MASK) );

However, when using the ALT key you might run afoul of the mnemonic initiator of the current look-and-feel. For example, if some main menu item has a mnemonic of 'A', hitting ALT+A will select that menu item rather than the one you want. It is probably better to use CTRL instead of ALT.