slider - Inverting alpha value java -

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i writing game slider controls alpha value of color. seems working fine except want invert alpha value. example if value 0 value become 255, , if value 255 become 0. unfortunately google searches turned no easy way or built in methods doing this. appreciated thanks.

do simple math :

int alphavalue = 255 - slidervalue

for example:

when slidervalue = 0, alphavalue = 255 - 0 = 255

when slidervalue = 255, alphavalue = 255 - 255 = 0


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