Android Question Positive digits only

I want 2 - 5 = 3 without -
How I can do it programmatically?
My concern is why do you want this ?
I know it is a simple question and you got the answer, but I am interested in the context: why do you want this ?
 
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i wanna subtract minutes from minutes the result is right but some time with negative mark , so i want it always positive .
that's all.
 
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