What is the output of this Java program?

class Driver $\{$

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

int a $=$ bar$(4)$;

int b $=$ foo$($a$)$;

$\}$

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

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

a $=$ bar$($a $-2)$;

return a;

$\}$

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

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

return a $+2$;

$\}$

$\}$