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FileReader fileReader = …;
LineNumberReader reader = new LineNumberReader(fileReader);
Based on 28 examples
public class LineNumberReader extends BufferedReader
A buffered character-input stream that keeps track of line numbers. This class defines methods {@link #setLineNumber(int)} and {@link #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.
Field Summary |
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Fields inherited from class java.io.Reader |
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lock |
Constructor Summary | |
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Create a new line-numbering reader, using the default input-buffer size. |
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LineNumberReader(Reader in, int sz) Create a new line-numbering reader, reading characters into a buffer of the given size. |
Method Summary | |
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int |
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. |
Methods inherited from class java.io.BufferedReader |
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close, mark, markSupported, read, read, readLine, readlines, ready, reset, skip |
Methods inherited from class java.io.Reader |
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close, mark, markSupported, read, read, read, read, ready, reset, skip |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public LineNumberReader(Reader in)
in
- A Reader object to provide the underlying streampublic LineNumberReader(Reader in, int sz)
in
- A Reader object to provide the underlying streamsz
- An int specifying the size of the bufferMethod Detail |
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public int getLineNumber()
public void mark(int readAheadLimit) throws IOException
mark
in class BufferedReader
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.IOException
- If an I/O error occurspublic int read() throws IOException
read
in class BufferedReader
IOException
- If an I/O error occurspublic int read(char[] cbuf, int off, int len) throws IOException
read
in class BufferedReader
cbuf
- Destination bufferoff
- Offset at which to start storing characterslen
- Maximum number of characters to readIOException
- If an I/O error occurspublic String readLine() throws IOException
readLine
in class BufferedReader
IOException
- If an I/O error occurspublic void reset() throws IOException
reset
in class BufferedReader
IOException
- If the stream has not been marked, or if the mark has been
invalidatedpublic void setLineNumber(int lineNumber)
lineNumber
- An int specifying the line numberpublic long skip(long n) throws IOException
skip
in class BufferedReader
n
- The number of characters to skipIOException
- If an I/O error occurs
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