$9\mathrm{.}10\mathrm{.}3-$ Show the output of the following code:

$($a$)$

public class Test $\{$

public static void main$($String$[]$ args$)\{$ int$[]$ a $=\{1,2\}$;

swap$($a$[0],$ a$[1])$; System.out.println$("$a$[0]="+$ a$[0]$

$+"$ a$[1]="+$ a$[1])$;

$\}$

public static void swap$($int n$1,$ int n$2)\{$ int temp $=$ n$1$;

n$1=$ n$2$; n$2=$ temp;

$\}$

$\}$