Java, split method, throws Exception

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Java

Hello,
Could you please clarify why my code (part of it provided below) throws the following exception when I am trying to split my words from hints separated by a period in my text file:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
at name.main(name.java:92) "92" corresponds to words.add(w[0]); in the code below:


File f = new File("name.txt");
Scanner fSc = new Scanner(f);
ArrayList<string> words = new ArrayList<string>();
ArrayList<string> hints = new ArrayList<string>();
while (fSc.hasNext())
{
String[] w = fSc.nextLine().split("."); // Split secret words from hints
words.add(w[0]);
hints.add(w[1]);
}