A simple Action that copies text from a Frame object

This Java Swing tip illustrates a method of copying text from a PageFrame object. This is a general tip that can be used by developers to include in any of their applications. Here the CopyAction class extends AbstractAction which provides a useful mechanism to implement action listeners that can be shared and coordinated.
import java.awt.event.ActionEvent;
import javax.swing.*;

public class CopyAction extends AbstractAction {

SiteManager manager;

public CopyAction(SiteManager sm) {
super("", new ImageIcon("copy.gif"));
manager = sm;
}

public void actionPerformed(ActionEvent ae) {

JInternalFrame currentFrame = manager.getCurrentFrame();
if (currentFrame == null) { return; }
// can't cut or paste sites
if (currentFrame instanceof SiteFrame) { return; }
((PageFrame)currentFrame).copyText();

}
}
source: http://java-tips.org