Scanner on text file hasNext() is infinite

Question

I\'m writing a simple program in Java and it requires reading data from a text file. However, I\'m having trouble counting lines. The issue seems generic enough for a simple

Answer 1

You can not use the scanner to count the no of line in file because as default scanner uses white space to separate tokens. I would suggest to use BufferReader and readline method.

http://docs.oracle.com/javase/6/docs/api/java/io/BufferedReader.html

private Integer getNoOfLines( String fileName) throws FileNotFoundException,
        IOException {
    FileInputStream fstream = new FileInputStream(fileName);
    DataInputStream in = new DataInputStream(fstream);
    BufferedReader br = new BufferedReader(new InputStreamReader(in));
    String strLine;
    List lineList = new ArrayList();
    while ((strLine = br.readLine()) != null) {
        lineList.add(strLine);
    }
    in.close();
    return lineList.size();
}