LineNumberReader Java

LineNumberReader Java

The character stream LineNumberReader is equivalent to LineNumberInputStream on byte streams side. Being a subclass of BufferedReader, it can make use of all the methods of BufferedReader like readLine() to read a line. getLineNumber() method of this class can be used to give line numbers.

Following is the class signature of LineNumberReader Java:

public class LineNumberReader extends BufferedReader

Giving Line Numbers

The functionality of LineNumberReader is to give line numbers that do not exist in the source file.

File Name: Cities.txt (this file is used in the next program)

Capital city: Delhi
Financial capital: Mumbai
Software jungle: Bengaluru
Pink city: Jaipur
Cyber city: Hyderabad (Cyberabad)

The above file is read by the following program and prints the lines along numbers.

LineNumberReader Java
Output screenshot on LineNumberReader Java

FileReader freader = new FileReader(&quot:Cities.txt&quot:);
LineNumberReader lnreader = new LineNumberReader(freader);

The file Cities.txt is passed to the constructor of FileReader to open in read-mode. The FileReader object freader is chained to LineNumberReader. The LineNumberReader includes a special method getLineNumber() capable to give line numbers that increments automatically.

Leave a Reply

Your email address will not be published. Required fields are marked *