Complete the following code and documentation.

$/**$

Returns the area of a square with given side length

Pre$-$condition:

@param side length of side of square

areturn area of square with given side length

@throws IllegalArgumentException if non$-$positive side length $*\frac{*}{?}$

public static int area$($int side$)\{$

if $,$

throw

$("$Non$-$positive side length:

$\}$

return side $**$ side;

side is non$-$negative

side $0$

side $1$

new Exception

new IIlegalArgumentException

IllegalArgumentException

Exception