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POJMenuItem Constructor Not Accepting Action
 

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  1. POJMenuItem Constructor Not Accepting Action
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    <p><code>JMenuItem</code> has the following constructor: (Source: <a href="http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/7-b147/javax/swing/JMenuItem.java#JMenuItem" rel="nofollow">GrepCode</a>)</p> <pre><code>public JMenuItem(Action a) { this(); setAction(a); } </code></pre> <p>However, when my code has</p> <pre><code>import javax.swing.*; import java.awt.event.ActionEvent; public class ActionTest extends JApplet { private final JFrame frame = new JFrame("Title"); private final JMenuBar menuBar = new JMenuBar(); private final JMenu fileMenu = new JMenu("File"); protected Action someAction; private JMenuItem someButton = new JMenuItem(someAction); public ActionTest() {} @Override public final void init() { frame.setJMenuBar(menuBar); menuBar.add(fileMenu); fileMenu.add(someButton); someButton.setText("Button"); someAction = new AbstractAction("Title") { public void actionPerformed(ActionEvent event) { //do stuff } }; frame.setVisible(true); } public static void main(String[] args) { JApplet applet = new ActionTest(); applet.init(); } } </code></pre> <p>and I press the <code>JMenuItem</code>, actionPerformed() is not even called.</p> <p>Is this a bug, or is my approach completely wrong?</p> <p>After doing more research, I find that <a href="http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/7-b147/javax/swing/event/EventListenerList.java#EventListenerList.add%28java.lang.Class%2Cjava.util.EventListener%29" rel="nofollow">this</a> is the method that it eventually boils down to. It seems to implement a shallow copy, which <a href="http://en.wikipedia.org/w/index.php?title=Object_copy&amp;oldid=493063601#Shallow_copy" rel="nofollow">should simply point to the same memory block that I gave it in the constructor</a>. </p> <p>The same thing should be occurring when I add the file menu to the menu bar. When the file menu is added, it references the memory block. Whatever is inside that memory block is what is displayed. Then, I add the menu item and it appears in the <code>JMenu</code>. </p> <p>Somehow it is different when I'm dealing with <code>Action</code>s or constructors. Could somebody explain the difference?</p>
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      1. USAndrew Thompson
 

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