For comma separators, the Arrays.toString method is the easiest solution. Consider this algorithm for collecting all matches into an an array.

int matchesSize $=0$;

for $($int i $=0$; i $<$ values.length; i$++)$

$\{$

if $($values$[$i$]$ fulfills the condition$)$

$\{$

matches$[$matchesSize$]=$ values$[$i$]$;

matchesSize$++$;

$\}$

$\}$

Adapt this algorithm, along with Arrays.toString to solve the previous problem.