how come swing components are lightweighted !

HI

to all here , While reading swings i got notice one thing almost all swing components have extended from awt components , while awt components are heavyweight how come swing components( most of them except top level compopnent ) are lightweight , what it is doing while extending that it is becoming lightweight.Can you please explain me this descriptively.

Thanks in Advance.

[398 byte] By [Ajit.Amitav.Dasa] at [2007-10-3 3:57:08]