public class MathMethods $\{$

public static void main$($String$[]$ args$)\{$

double x;

x $=$ Math.abs$(-6\mathrm{.}4+6\mathrm{.}3)$;

$//$ This will output $1$ decimal place

System.out.printf$("\%\mathrm{.}1$f

$",$ x$)$;