Java compact1, compact2, compact3 java.io Class LineNumberReader（JDK8）

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