Java.io.LineNumberReader.read() Method


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Description

The java.io.LineNumberReader.read() method reads a single character.

Declaration

Following is the declaration for java.io.LineNumberReader.read() method −

public int read()

Parameters

NA

Return Value

The method returns the character read, or -1 if the end of the stream has been reached.

Exception

IOException − If an I/O error occurs.

Example

The following example shows the usage of java.io.LineNumberReader.read() method.

package com.tutorialspoint;

import java.io.FileReader;
import java.io.IOException;
import java.io.LineNumberReader;

public class LineNumberReaderDemo {

   public static void main(String[] args) throws IOException {
      FileReader fr = null;
      LineNumberReader lnr = null;
      int i;
      char c;
      
      try {
      
         // create new reader
         fr = new FileReader("C:/test.txt");
         lnr = new LineNumberReader(fr);
         
         while((i = lnr.read())!=-1) {
         
            // converts int to char
            c = (char)i;
            
            // prints character
            System.out.println(c);
         }
         
      } catch(Exception e) {
         
         // if any error occurs
         e.printStackTrace();
      } finally {
         
         // closes the stream and releases system resources
         if(fr!=null)
            fr.close();
         if(lnr!=null)
            lnr.close();
      }
   }
}

Assuming we have a text file c:/test.txt, which has the following content. This file will be used as an input for our example program −

ABCDE

Let us compile and run the above program, this will produce the following result −

A
B
C
D
E

java_io_linenumberreader.htm

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