Correct the definition of toString.

$($a$)$ String toString$()$ can use java.util.Arrays.toString.

This is what I have so far, I am trying to add commas in between each element of the string but it isn't working.

public String toString$()\{$

String str $="["$;

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

str $+=$ values$[$i$]$;

if$($str$.$length$()>1)\{$

str $+=","$

$\}$

$\}$

str $+="]"$;

return str;