title: How to open JFileChooser from menu item actionPerformed?
body: <p>Like in title how to make happen that when I click on menu item should open <code>JFileChooser</code> to select *.txt file?</p>
  
  <p>I'm trying this <code>ActionListener</code> but don't know how to use is to make it work: could you give me some lead?</p>