JMenuItem has the following constructor: (Source: GrepCode)
public JMenuItem(Action a) {
this();
setAction(a);
}
However, when my code has
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();
}
}
and I press the JMenuItem, actionPerformed() is not even called.
Is this a bug, or is my approach completely wrong?
After doing more research, I find that this is the method that it eventually boils down to. It seems to implement a shallow copy, which should simply point to the same memory block that I gave it in the constructor.
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 JMenu.
Somehow it is different when I'm dealing with Actions or constructors. Could somebody explain the difference?
