Duvida -> painel.setLayout(new FlowLayout(FlowLayout.CENTER, 30, 20));

Pessoa sera que alguem pode me dizer oq essa parte do Codigo diz
em especial quando ele diz new FlowLayout(FlowaLayout.Center, 30, 20))

  painel.setLayout(new FlowLayout(FlowLayout.CENTER, 30, 20));

A documentação oficial pode:
http://download.oracle.com/javase/tutorial/uiswing/layout/using.html
http://download.oracle.com/javase/tutorial/uiswing/layout/visual.html
http://download.oracle.com/javase/7/docs/api/java/awt/FlowLayout.html#FlowLayout(int,%20int,%20int)

vlw

ViniGodoy