What is the complexity of given code segment below?

public static void whoknows$($String$[]$ arr, String $x)\{$

for $($int $i=0$;$i$ arr.length; $i++\{$

if$($arr$[$i$].$equals $(x))\{$

System.out. println$("$X$")$;

return;

$\}$

$\}$

$\}$