How can I use the function keys in a GUI with swing?

I'm wondering how do you declare you want an action to happen when a user uses a function key or any key for that matter. How can you specify something frame wide or for that matter for a specific jtextbox?

you need to use an accelerator
setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_A, java.awt.event.InputEvent.SHIFT_MASK | java.awt.event.InputEvent.CTRL_MASK)

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