[android-developers] design of accessing to system service

I still can't understand some aspects of Android API design or reason
to use this design.

For example why Android use this:

AlarmManager am =
(AlarmManager)getSystemService(Context.ALARM_SERVICE);

instead of much easier:

AlarmManager am = getSystemService(AlarmManager.class);

AlarmManager.class is possible convert to String a use as key in the
same way as constant. Android also support generics.

Developer also must remember, that Context.ALARM_SERVICE constant will
provide AlarmManager instance. Constant has different name that
class :-(

Or first one is so much faster?

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