What is the output from the following code? Your answer must be exactly correct $($For a decimal point, write up to the tenths place, e$.$g$.,0\mathrm{.}0).$

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

int $a=45$;

int $b=10$;

System.out.println$(($double$)($a$/$b$))$;

$\}$