$//$Find the output

class Testmain $\{$

int $x=5$;

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

T$1$ obj$=$new T$1()$;

System.out.println$($obj$.$fun$())$;

$\}$

class T$1$

$\{$

int $y=5$;

int fun$()\{$

return $++y$;

$\}$

$\}$