java.util.scanner - Need to subtract one from user input. How? Java -

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basically need know how subtract 1 user input. trying x , y coordinate user place 2d array can 20x20, if user puts in 20, need program read 19 not out of bounds. 

 x = keyboard.nextint()

is have now.

// solution 1 x = math.min(19, math.max(0, keyboard.nextint() - 1));  // solution 2 x = keybord.nextint() - 1; if(x < 0) {   // error?!   x = 0; } else if(x > 19) {   // error?!   x = 19 }

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