java - Netbeans IDE 6.91 "center horizontally" not clickable -

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i decent java programming, new gui development. wanted make console blackjack game made years ago 1 people can play via gui build using netbeans. think without gui, people won't take game when add working portfolio

i created jframe size set 1000x700 pixels , on top of jpanel background of dark green simulate blackjack table.

on top of the dark green jpanel have small 60x93 jlabel icon set of playing card. represents dealer , wanted center horizontally , vertically on top of jpanel on rests.

however, in netbeans tool bar particular gui "center horizontally" , "center vertically" options greyed out , not clickable when select jlabel dealer. tried shift clicking select both jlabel , jpanel on rests still "center horizontally" , "center vertically" options greyed out.

can please me or offer guidance please? thank you... have spent 2 days googling , don't understand how others have not run same problem.

interesting question. i've been working netbeans years, , honest i've never noticed icons before until pointed them out. i'm unable make them either.

however, if you're new gui development in java... should read layout managers, , spend time the gridbaglayout tutorial. gridbaglayout far popular layout manager in swing development. using exclusively if wanted, there handful of real-word situations in makes more sense use layout manager.

for immediate purposes: in inspector view, right-click on jpanel , select "set layout -> grid bag layout". you'll see layout manager in inspector tree view right below jpanel. right-click on , select "customize". window pop-up, , there can click on component you're interested in , adjust kinds of settings (e.g. margins, padding, etc). setting in interested "anchor", , value want "center". jlabel selected, can adjust setting either pull-down menu @ top-left... or graphically @ top-bottom.

one way or other, if you're going kind of java gui development beyond trivial of "hello world" examples... you're going using gridbaglayout soon. might dive in!


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