I would like to add smth. more to the last message.
"Heavyweight" means that component is not written in pure
java and uses native to current OS code. Swing generally consist of "lightweight" components, written in Java only.
But still extends AWT adn container classes, for example JFrame has a native code. and
Applet class also..
It is not good practice to mix different components in one application. For example labels can be sometime visible on many tabs instead of one and so on...
alex from javafaq.nu
daily tips and advices