Complete the Java recursive function to calculate the sum of all even numbers from $1$ to $\text{'}$n$\text{'}.$ The function should take an integer $\text{'}$n$\text{'}$ as input and return the sum of even numbers within that range.

public static int sumEvenNumbers$($int n$)\{$

if $($n $==0)\{$

return $0$;

$\}$ else $\{$

$//$ Your code here: Calculate and add the even number$($s$)$ to the sum.

$//$ You may need to make a recursive call.

$\}$

$\}$

Your task is to fill in the missing part of the code inside the function to correctly calculate and return the sum of even numbers from $1$ to $\text{'}$n$\text{'}.$

Hint: To check if a number is even in Java, you can use the modulo operator $\%.$ If n $\%2$ equals $0,$ then $\text{'}$n$\text{'}$ is an even number. You can use this information to determine whether to include $\text{'}$n$\text{'}$ in the sum of even numbers.