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POSome doubts about visibility of the variable inside an inner class declared in a method
 

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  1. POSome doubts about visibility of the variable inside an inner class declared in a method
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    <p>I have the following doubt related to how work this method:</p> <pre><code>protected JButton createToolbarButton(String name, final String id, final JPanel panel) { JButton button = new JButton(name); // Create a new JButton // If the passed Jpanel named "panel" exist, add this to the JPanel named content (the CardLayout container) if (panel != null) content.add(panel, id); else button.setEnabled(false); // Otherwise disable this button button.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { //System.out.println(panel.getClass()); if (panel instanceof SchedulingPanel) ((SchedulingPanel)panel).getTasksSettings().fireSettingsUpdated(); else if (panel instanceof EventsPanel) ((EventsPanel)panel).refreshPanel(); else if (panel instanceof ConfigurationPanel) ((ConfigurationPanel)panel).refreshPane(); showSection(id); } }); return button; } </code></pre> <p>I have this method named <strong>CreateToolbarButton</strong> that have some input parameters including the <strong>String id</strong> parameter.</p> <p>As you can see in this method I add an <strong>ActionListener inner class</strong> to my JButton object (that handles the click event on this button).</p> <p>Inside this <strong>ActionListener inner class</strong> it is declared the <strong>actionPerformed()</strong> method that handle the click event and at the end of this method it call the <strong>showSection(id)</strong> method passing to id the <strong>id</strong> paramether that seems to be the same one of the <strong>createToolbarButton()</strong> input paramether.</p> <p>So it seems to me that inside my <strong>ActionListener inner class</strong> I have visibility also of the paramether and variable of the container method (<strong>createToolbarButton()</strong>)</p> <p>Is it right? Why? it seems a litle strange to me</p> <p>Tnx</p> <p>Andrea</p>
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    1. USAndreaNobili
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    1. COYes, `final` variables are visible in the anonymous inner class.
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    2. COpossible duplicate of [local variable is accessed within inner class (java)](http://stackoverflow.com/questions/5644334/local-variable-is-accessed-within-inner-class-java)
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    3. COSee http://docs.oracle.com/javase/tutorial/java/javaOO/anonymousclasses.html#accessing
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      1. USPM 77-1
 

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