How to save strings from StringSplit to different arrays

Hi.. I am having a problem regarding the saving of split words from StringSplit function..
array output stores my input per line

my input, for instance is:

int data_type
a identifier
. terminator

i use:

for(int i=0;i<=outputlength;i++)
array[i]=java.util.Arrays.toString(output[j].split(" "));

then if i print the contents of array[], i get:

int, data_type
a, identifier
., terminator

i want to get the first words of lines into an array and the second words into another array,
for example:
array a has [int, a, .]
and array b has [data_type, identifier, terminator]

Any kind of help will be appreciated, thank you!