I installed NetBeans 7.2 under my Ubuntu 12.04. And to invoke javadoc, I press the HOT KEY Alt+F1 when mouse is on the word, but it will only trigger Ubuntu's Applications menu on the top-left corner of my desktop (Gnome). How to solve the conflict issue?
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Pressing Ctrl-Space at the end of a class or variable name will also show JavaDoc in NetBeans. Alternatively, you can change or disable the Gnome shortcut, or change the NetBeans shortcut.

Daniel
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In my Ubuntu, to press Ctrl-Space will invode the Chinese character input...So how to change the NetBeans shortcut or Ubuntu's shortcut? Thanks! – Tom Xue Aug 04 '12 at 08:06
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To change the NetBeans shortcut, go to the Keymap section of the NetBeans options. – Daniel Aug 04 '12 at 08:13