how to identify which control get focus

suppose there are two textbox and we want to find which textbox has got foucus currently?

there are a number of ways

check the textfields to see if either currently has the focus
if(textField1.isFocusOwner())...
else if(textField2.isFocusOwner())...

check the focusManager to get the focused component,
Component currentFocusOwner = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();

add focusListeners, and set flags when focused