Class java.io.LineNumberReader - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Class java.io.LineNumberReader

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

public class LineNumberReader
extends BufferedReader

A buffered character-input stream that keeps track of line numbers. 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.

LineNumberReader(Reader): Create a new line-numbering reader, using the default input-buffer size.
LineNumberReader(Reader, int): Create a new line-numbering reader, reading characters into a buffer of the given size.

getLineNumber(): Get the current line number.
mark(int): Mark the present position in the stream.
read(): Read a single character.
read(char[], int, int): Read characters into a portion of an array.
readLine(): Read a line of text.
reset(): Reset the stream to the most recent mark.
setLineNumber(int): Set the current line number.
skip(long): Skip characters.

LineNumberReader

 public LineNumberReader(Reader in)

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

LineNumberReader

 public LineNumberReader(Reader in,
                         int sz)

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

setLineNumber

 public void setLineNumber(int lineNumber)

Set the current line number.

getLineNumber

 public int getLineNumber()

Get the current line number.

read

 public int read() throws IOException

Read a single character. Line terminators are compressed into single newline ('\n') characters.

Returns:: The character read, or -1 if the end of the stream has been reached
Throws: IOException: If an I/O error occurs
Overrides:: read in class BufferedReader

read

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

Read characters into a portion of an array.

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
Overrides:: read in class BufferedReader

readLine

 public String readLine() throws IOException

Read a line of text. 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.

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
Overrides:: readLine in class BufferedReader

skip

 public long skip(long n) throws IOException

Skip characters.

Parameters:: n - The number of characters to skip
Returns:: The number of characters actually skipped
Throws: IOException: If an I/O error occurs
Overrides:: skip in class BufferedReader

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.

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
Overrides:: mark in class BufferedReader

reset

 public void reset() throws IOException

Reset the stream to the most recent mark.

Throws: IOException: If the stream has not been marked, or if the mark has been invalidated
Overrides:: reset in class BufferedReader

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