LineNumberReader readLine() in Java

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

Syntax:

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

This method read a line of text. Whenever a line terminator is read the current line number is incremented.

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.

Throws:

IOException - If an I/O error occurs

Approach

Java

import java.io.IOException;
import java.io.LineNumberReader;
import java.io.Reader;
import java.io.StringReader;

public class LineNumberReaderreadLine {
    public static void main(String[] args) {

        Reader in = new StringReader("Hello");
        LineNumberReader lineNumberReader =
                         new LineNumberReader(in);

        try {
            System.out.println(lineNumberReader.readLine());
        } catch (IOException e) {
            System.out.println("IOException occurs");
        }
    }
}

Output:

Hello

Some other methods of LineNumberReader

getLineNumber(): This method gets the current line number.

LineNumberReader(Reader): This method creates a new line-numbering reader, using the default input buffer size.

LineNumberReader(Reader, int): This method creates a new line-numbering reader, reading characters into a buffer of the given size.

mark(int): This method marks the present position in the stream.

read(): This method read a single character.

read(char[], int, int): This method read characters into a portion of an array.

reset(): This method resets the stream to the most recent mark.

setLineNumber(int): This method sets the current line number.

skip(long): This method skips characters.