What is the output of this Java program?

class Driver $\{$

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

foo$(0)$;

bar $(6)$;

$\}$

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

bar $(a+1)$;

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

$\}$

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

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

$\}$

$\}$