Prototyping Java

We have a java person here that rewrote the javamail utility and added
several features.  It uses arrays to pass data and no one here has ever
had to fig out how to prototype a java program. How do you even begin
this process. I have a sample of the java call below.

public USXMessage(javax.mail.internet.InternetAddress[] from,
                  javax.mail.internet.InternetAddress[] to,
                  javax.mail.internet.InternetAddress[] cc,
                  javax.mail.internet.InternetAddress[] replyTo,
                  java.lang.String subject,
                  java.lang.String text,
                  java.lang.String[] attachments)Creates an email
message using the given criteria
Parameters:
from - - Array of values to be used for the from field of the email
message
to - - Array of email address for the recipient of the email message
cc - - Array of email address for the email message to be carbon copied
to
replyTo - - Array of email address to be used when replying to the sent
email
subject - - Value to be used for the subject of the email message
text - - Text message
attachments - - Array of Files to be attached to the email message