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Showing content from https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/LineNumberReader.html below:

LineNumberReader (Java SE 21 & JDK 21)

All Implemented Interfaces:

Closeable, AutoCloseable, Readable

A buffered character-input stream that keeps track of line numbers. This class defines methods

and

for setting and getting the current line number respectively.

By default, line numbering begins at 0. This number increments at every line terminator as the data is read, and at the end of the stream if the last character in the stream is not a line terminator. This number can be changed with a call to setLineNumber(int). Note however, that setLineNumber(int) does not actually change the current position in the stream; it only changes the value that will be returned by getLineNumber().

A line is considered to be terminated by any one of a line feed ('\n'), a carriage return ('\r'), or a carriage return followed immediately by a linefeed, or any of the previous terminators followed by end of stream, or end of stream not preceded by another terminator.

Since:

1.1

• Field Summary
• Constructor Summary

  Constructors

  Create a new line-numbering reader, using the default input-buffer size.

  Create a new line-numbering reader, reading characters into a buffer of the given size.

• Method Summary

  int

  Get the current line number.

  void

  Mark the present position in the stream.

  int

  int

  read(char[] cbuf, int off, int len)

  Reads characters into a portion of an array.

  void

  Reset the stream to the most recent mark.

  void

  Set the current line number.

  Methods declared in class java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

• Constructor Details
  • LineNumberReader public LineNumberReader(Reader in)

    Create a new line-numbering reader, using the default input-buffer size.

    Parameters:

    in - A Reader object to provide the underlying stream

  • LineNumberReader public LineNumberReader(Reader in, int sz)

    Create a new line-numbering reader, reading characters into a buffer of the given size.

    Parameters:

    in - A Reader object to provide the underlying stream

    sz - An int specifying the size of the buffer

• Method Details
  • setLineNumber

    public void setLineNumber(int lineNumber)

    Set the current line number.

    Parameters:

    lineNumber - An int specifying the line number

    See Also:

    • getLineNumber()

  • getLineNumber

    public int getLineNumber()

    Get the current line number.

    Returns:

    The current line number

    See Also:

    • setLineNumber(int)

  • read

    Read a single character.

    Line terminators

    are compressed into single newline ('\n') characters. The current line number is incremented whenever a line terminator is read, or when the end of the stream is reached and the last character in the stream is not a line terminator.

    Overrides:

    read in class BufferedReader

    Returns:

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

    Throws:

    IOException - If an I/O error occurs

  • read public int read(char[] cbuf, int off, int len)

    throws

    IOException

    Reads characters into a portion of an array. This method will block until some input is available, an I/O error occurs, or the end of the stream is reached.

    If len is zero, then no characters are read and 0 is returned; otherwise, there is an attempt to read at least one character. If no character is available because the stream is at its end, the value -1 is returned; otherwise, at least one character is read and stored into cbuf.

    Line terminators are compressed into single newline ('\n') characters. The current line number is incremented whenever a line terminator is read, or when the end of the stream is reached and the last character in the stream is not a line terminator.

    Overrides:

    read in class BufferedReader

    Parameters:

    cbuf - Destination buffer

    off - Offset at which to start storing characters

    len - Maximum number of characters to read

    Returns:

    The number of characters read, or -1 if the end of the stream has been reached

    Throws:

    IndexOutOfBoundsException - If off is negative, or len is negative, or len is greater than cbuf.length - off

    IOException - If an I/O error occurs

  • readLine

    Read a line of text.

    Line terminators

    are compressed into single newline ('\n') characters. The current line number is incremented whenever a line terminator is read, or when the end of the stream is reached and the last character in the stream is not a line terminator.

    Overrides:

    readLine in class BufferedReader

    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

    See Also:

    • Files.readAllLines(java.nio.file.Path, java.nio.charset.Charset)

  • mark public void mark(int readAheadLimit)

    throws

    IOException

    Mark the present position in the stream. Subsequent calls to reset() will attempt to reposition the stream to this point, and will also reset the line number appropriately.

    Overrides:

    mark in class BufferedReader

    Parameters:

    readAheadLimit - Limit on the number of characters that may be read while still preserving the mark. After reading this many characters, attempting to reset the stream may fail.

    Throws:

    IOException - If an I/O error occurs

  • reset

    Reset the stream to the most recent mark.

    Overrides:

    reset in class BufferedReader

    Throws:

    IOException - If the stream has not been marked, or if the mark has been invalidated

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