Need help on java 'dynamic class loading'

dyweil — Mon, 07 Jun 2010 18:49:55 +0800

I have problem loading *.class file from jFileChooser and it always display 'classnotfoundexception' error msg.

CODE

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
JFileChooser filechooser = new JFileChooser(".");
filechooser.setAcceptAllFileFilterUsed(false);
FileNameExtensionFilter filter = new FileNameExtensionFilter("Java classes", "class");
filechooser.addChoosableFileFilter(filter);
filechooser.showOpenDialog(DemoFrame.this);
JOptionPane.showMessageDialog(null,"Selected File is: "+filechooser.getSelectedFile().getName());
JOptionPane.showMessageDialog(null,filechooser.getSelectedFile().getAbsolutePath());

try {
URL url = filechooser.getSelectedFile().toURL();
System.out.println(url.getFile());
URL[] urls = new URL[] {url};
URLClassLoader loader = new URLClassLoader(urls);
Class cls = loader.loadClass(filechooser.getSelectedFile().getName());

} catch (ClassNotFoundException ex) {
Logger.getLogger(DemoFrame.class.getName()).log(Level.SEVERE, null, ex);
} catch (MalformedURLException ex) {
Logger.getLogger(DemoFrame.class.getName()).log(Level.SEVERE, null, ex);
}
}

Can someone figure it out which part went wrong?

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Need help on java 'dynamic class loading'