BufferedReader readLine() in Java

readLine(): This method is available in the java.io.BufferedReader class of Java.

Syntax:

String java.io.BufferedReader.readLine() throws IOException

This method reads a line of text. A line is considered to be terminated by any one of a line feed ('\n'), a carriage return ('\r'), a carriage return followed immediately by a line feed, or by reaching the end-of-file(EOF).

Parameters: NA

Returns: A String containing the contents of the line, not including any line-termination characters, or null if the end of the stream has been reached without reading any characters.

Throws:

IOException - If an I/O error occurs.

Note:

hello.txt contains

Hello World

Approach 1: When no exception

Java

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class BufferedReaderreadLine {
    public static void main(String[] args) throws IOException {

        FileReader fileReader = new FileReader("D:\\hello.txt");
        BufferedReader bufferedReader = 
                    new BufferedReader(fileReader);

        System.out.println(bufferedReader.readLine());
        bufferedReader.close();

    }
}

Output:

Hello World

Approach 2: IOException

Java

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class BufferedReaderreadLine {
    public static void main(String[] args) throws IOException {

        FileReader fileReader = new FileReader("D:\\hello.txt");
        BufferedReader bufferedReader = 
                    new BufferedReader(fileReader);

        bufferedReader.close();
        System.out.println(bufferedReader.readLine());

    }
}

Output:

Exception in thread "main" java.io.IOException: Stream closed
	at java.base/java.io.BufferedReader.ensureOpen(BufferedReader.java:122)
	at java.base/java.io.BufferedReader.readLine(BufferedReader.java:319)
	at java.base/java.io.BufferedReader.readLine(BufferedReader.java:392)