java - How to require the user to click a button before submitting? -

java - How to require the user to click a button before submitting? -

i making star rating system

there 5 buttons in frame

if user clicks first button, add together 1 rating if user clicks sec button, add together 2 rating, , on

but if user clicks submit before pressing button rating zero

i want create each user has rate, before leave.

i read that jbutton have method ispressed() , don't have in netbeans?

i think all, give thanks much if willing help, sorry english language btw!

java jbutton