What is the output of the following Java program?

public class Test $\{$

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

int $[]$ a $=\{1,2,3\}$;

swap$(a)$;

System.out.print $ln(a[]+**+a[1])$;

$\}$

public static void swap$({\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}[]x)$ f

int temp $=x$;

$x[]=x[1]$

$x[1]=$ temp;

$\}$

$\}$

$11$

compile error

runtime error

$22$

$12$

$21$