What is the output of the following code?

Java C#

class Numbers $\{$

public int a;

public int b;

public Numbers$($int c$)\{$

a$=$c;

b$=$c$*2$;

$\}$

@Override

public String toString$()\{$

return$("$a: $"+$a$+"$ b: $"+$b$)$;

$\}$

$\}$

class Main $\{$

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

Numbers n$1=$new Numbers$(2)$;

System.out.println$($n$1)$;

$\}$

$\}$