public class LineNumberReaderExample
public static void main(String args) throws Exception
// In this example we use LineNumberReader class to read file contents.
// try to do here is to get the line number of the read data. Instead
// of introducing another variable; an integer for instance; to keep
// track the line number we can utilize the LineNumberReader class.
// This class offers the getLineNumber() method the know the current
// line of the data that is read.
File file = null;
FileReader fr = null;
LineNumberReader lnr = null;
// We'll read a file called student.csv that contains our student
// information data.
file = new File("student.csv");
// To create the FileReader we can pass in our student data file
// to the reader. Next we pass the reader into our LineNumberReader
fr = new FileReader(file);
lnr = new LineNumberReader(fr);
// If we set the line number of the LineNumberReader here we'll
// got the line number start from the defined line number + 1
String line = "";
while ((line = lnr.readLine()) != null)
// We print out the student data and show what line is currently
// read by our program.
System.out.println("Line Number " + lnr.getLineNumber() + ": " + line);
// Don't forget to close the stream when we finish reading the file.
if (fr != null)
if (lnr != null)