public void actionPerformed(ActionEvent evt) {
        String cmd = evt.getActionCommand();
        if (cmd.equals("copy")) { 
           // Implement Copy operation
           String srcData = text.getText();
           if (srcData != null) {
		StringSelection contents = new StringSelection(srcData);
                clipboard.setContents(contents, this);
                pasteButton.setEnabled(true);
            }