Problem with reading resource bundle

[Haris Karameh]

I created resource bundle file with content:
S aaaa
S bbbb
S cccc

When program opens rb and retrieves single key like
ResourceBundle rb=ResourceBundle.getBundle("mybundle");
...
String s=rb.getString("S");
rezult is "cccc"

If I try:
String[] s=rb.getStringArray("S");
I am getting an exception:
java.lang.ClassCastException: java.lang.String

should not result be ["aaaa","bbbb","cccc"] or I am missing something?