NullPointerExcetion Native Method Accessor… Hashing Words Issue

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This whileloop is strange:

while (scanner.hasNextLine()) {
    String line = scanner.nextLine();
    while (line != null) {
       String word = scanner.next();
       addWord(word, linecount);
    }
    linecount++;
}

If your input file is:

Then scanner.nextLine() would be return a, then scanner.next() would return b, because nextLine returns the next end-line delimited String, and next returns the next token from the input file. Is this really what you want? I’d suggest trying this:

while (scanner.hasNextLine()) {{
    String word = scanner.nextLine();
    addWord(word, linecount);

    linecount++;
}

Keep in mind that this would only work if there’s only a word per line. If you want to handle multiple words per line, it’d be slightly longer:

while (scanner.hasNextLine()) {{
    String line = scanner.nextLine();

    Scanner lineScanner = new Scanner(line);
    while(lineScanner.hasNext()) {
        addWord(lineScanner.next(), linecount);
    }

    linecount++;
}

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