[android-developers] including/excluding conditional code in different builds

is there a way to enclose conditional code for different builds - for
example:

in VISUAL C++ i use 'ifdef DEBUG' for code that is only included in
the debug build and i can be sure that any testing code does not end
up in the release build - inflating its size.

i searched the java/android docs & blogs without success so where do i
find information on this sort of thing?
and how do you pros do it?

any help would be greatly appreciated... thanks in advance

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