java.lang.Object
- java.io.Reader
- - java.io.BufferedReader
  - - java.io.LineNumberReader

All Implemented Interfaces:

Closeable, AutoCloseable, Readable
```
public class LineNumberReader
extends BufferedReader
```
A buffered character-input stream that keeps track of line numbers. This class defines methods setLineNumber(int) and getLineNumber() 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 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.

Since:

JDK1.1

Field Summary
- Fields inherited from class java.io.Reader lock

Constructor Summary

Constructors
Constructor and Description
`LineNumberReader(Reader in)` Create a new line-numbering reader, using the default input-buffer size.
`LineNumberReader(Reader in, int sz)` Create a new line-numbering reader, reading characters into a buffer of the given size.

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Method Summary

Methods
Modifier and Type	Method and Description
`int`	`getLineNumber()` Get the current line number.
`void`	`mark(int readAheadLimit)` Mark the present position in the stream.
`int`	`read()` Read a single character.
`int`	`read(char[] cbuf, int off, int len)` Read characters into a portion of an array.
`String`	`readLine()` Read a line of text.
`void`	`reset()` Reset the stream to the most recent mark.
`void`	`setLineNumber(int lineNumber)` Set the current line number.
`long`	`skip(long n)` Skip characters.

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Methods inherited from class java.io.BufferedReader close, markSupported, ready

Methods inherited from class java.io.Reader read, read

Methods inherited from class java.lang.Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - 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 Detail
  - 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
    public int read() throws IOException
    
    Read a single character. Line terminators are compressed into single newline ('\n') characters. Whenever a line terminator is read the current line number is incremented.
    
    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
    
    Read characters into a portion of an array. Whenever a line terminator is read the current line number is incremented.
    
    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 bytes read, or -1 if the end of the stream has already been reached
    
    Throws:
    
    IOException - If an I/O error occurs
  - readLine
    public String readLine() throws IOException
    
    Read a line of text. Whenever a line terminator is read the current line number is incremented.
    
    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)
  - skip
    public long skip(long n) throws IOException
    
    Skip characters.
    
    Overrides:
    
    skip in class BufferedReader
    
    Parameters:
    n - The number of characters to skip
    
    Returns:
    The number of characters actually skipped
    
    Throws:
    
    IOException - If an I/O error occurs
    
    IllegalArgumentException - If n is negative
  - 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
    public void reset() throws IOException
    
    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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Vielen Dank im Voraus.

Dokument erstellt 11/06/2005, zuletzt geändert 04/03/2020
Quelle des gedruckten Dokuments:https://www.gaudry.be/de/java-api-rf-java/io/LineNumberReader.html

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Referenzen

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Inhaltsverzeichnis Haut

Class LineNumberReader

Referenzen