how i mention values properties record retrieved controlling resourcebundle#getstringarray?

i am perplexing resourcebundle#getstringarray collect string[] properties file. outline slight support reads:

gets twine array given pivotal apparatus gold the parents.

however, i have attempted store values properties record churned sole key/value pairs:

key=value1
key=value2
key=value3

and comma-delimited list:

key=value1,value2,value3

but conjunction retrievable controlling resourcebundle#getstringarray.

how paint set key/value pairs properties record such retrieved controlling resourcebundle#getstringarray?

code1