how to active menu item by press Alt key

Hi everyone,I don't know how can i active jmenu bar by pressing Alt key first, and press another key ( for exp. press 'F' go to File menu), they are not at the same by holding Alt key. Thanks for help in advance.
[236 byte] By [bigtoolbara] at [2007-10-2 13:09:03]
# 1
http://java.sun.com/j2se/1.5.0/docs/api/javax/swing/AbstractButton.html#setMnemonic(int)
CeciNEstPasUnProgrammeura at 2007-7-13 10:35:17 > top of Java-index,Java Essentials,Java Programming...
# 2
I still didn't get it, would you like give me some details.How do i make the ALT key select it (but not open it).By pressing the "F' key, the "File "menu selected should be opened.
bigtoolbara at 2007-7-13 10:35:17 > top of Java-index,Java Essentials,Java Programming...