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BufferedReader readLine() method in Java with Examples

  • Last Updated : 28 May, 2020

The readLine() method of BufferedReader class in Java is used to read one line text at a time. The end of a line is to be understood by ‘\n’ or ‘\r’ or EOF.

Syntax:

public String readLine() 
          throws IOException

Parameters: This method does not accept any parameter.

Return value: This method returns the String that is read by this method and excludes any termination symbol available. If the buffered stream has ended and there is no line to be read then this method returns NULL.

Exceptions: This method throws IOException if an I/O error occurs.

Below programs illustrate readLine() method in BufferedReader class in IO package:

Program 1: Assume the existence of the file “c:/demo.txt”.




// Java program to illustrate
// BufferedReader readLine() method
  
import java.io.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // Read the stream 'demo.txt'
        // containing text
        // "GEEKS"
        // "FOR"
        // "GEEKS"
        FileReader fileReader
            = new FileReader(
                "c:/demo.txt");
  
        // Convert fileReader to
        // bufferedReader
        BufferedReader buffReader
            = new BufferedReader(
                fileReader);
  
        while (buffReader.ready()) {
            System.out.println(
                buffReader.readLine());
        }
    }
}
Input:
Output:

Program 2: Assume the existence of the file “c:/demo.txt”.




// Java program to illustrate
// BufferedReader readLine() method
  
import java.io.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // Read the stream 'demo.txt'
        // containing text
        // "GEEKSFORGEEKS"
        // "geeksforgeeks"
        FileReader fileReader
            = new FileReader(
                "c:/demo.txt");
  
        // Convert fileReader to
        // bufferedReader
        BufferedReader buffReader
            = new BufferedReader(
                fileReader);
  
        while (buffReader.ready()) {
            System.out.println(
                buffReader.readLine());
        }
    }
}
Input:
Output:

References:
https://docs.oracle.com/javase/10/docs/api/java/io/BufferedReader.html#readLine()


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