How to count the number of lines in a text file using java

The Java language provides a lot og useful classes to handle files, the LineNumberReader class is one of them.

In the following method I'm using the LineNumberReader to retrieve the length of a text file in terms on number of lines.

    private int getNumberOfLines(String filename) {
        int lines = 0;
        LineNumberReader lnr;
        try {
            lnr = new LineNumberReader(new FileReader(new File(filename)));
            lnr.skip(Long.MAX_VALUE);
            lines = lnr.getLineNumber();
            lnr.close();
        } catch (FileNotFoundException ex) {
            Logger.getLogger(FbFrame.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(FbFrame.class.getName()).log(Level.SEVERE, null, ex);
        }
        return (lines);
    }

To use this method you have to pass to it the path to the text file you want to analyze, and you'll get the number of lines contained in it.

Gg1