What is the output of this Java program?

class Driver $\{$

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

foo$(0)$;

$\frac{?}{\text{b}\text{a}\text{r}}(6)$;

$\}$

static void foo$($int a$)\{$

$\frac{?}{\text{b}\text{a}\text{r}}(a+1)$;

system.out.print$($a$)$;

$\}$

static void bar$($int a$)\{$

system.out.print$($a$)$;

$\}$

$\}$