Casting issue, help someone.

I'm having a casting issue taking an ArrayList of String[] objs converting to a single String array, separated... Anyone with clues?
String[] allDataString = new String[mCapacity];
     for (int i=(mData.size()-1); i>0; i--)
     allDataString[i] = (String)mData.get(i);               
PELEEEEZE HEEELLP. Thanks.

String[] allDataString = new String[mCapacity];
for (int i=(mData.size()-1); i>0; i--)
allDataString = (String)mData.get(i);
}

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