title: How to add a shortcut (Mnemonics) to a JMenuItem
body: <p>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).</p>
  
  <pre><code> 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");
  
          }
  
      });
  </code></pre>