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Class java.io.PushbackInputStream

java.lang.Object
   |
   +----java.io.InputStream
           |
           +----java.io.FilterInputStream
                   |
                   +----java.io.PushbackInputStream

public class PushbackInputStream

extends FilterInputStream

Version:

1.6, 31 Jan 1995

Author:

Jonathan Payne

lineNumber

The current line number.

pushBack

Push back character.

PushbackInputStream(InputStream)

Creates a PushbackInputStream.

currentLine()

Returns the current line number.

read()

Reads a byte.

read(byte[], int, int)

Reads into an array of bytes.

unread(int)

Pushes back a character.

  protected int pushBack

Push back character.

  protected int lineNumber

The current line number.

  public PushbackInputStream(InputStream in)

Creates a PushbackInputStream.

Parameters:

in - the input stream

  public int read()

Reads a byte. Will block if no input is available.

Returns:

the byte read, or -1 if the end of the stream is reached.

Throws: IOException

i/o error occurred

Overrides:

read in class FilterInputStream

read

  public int read(byte bytes[],
                  int offset,
                  int length)

Reads into an array of bytes. Blocks until some input is available. This method should be overridden in a subclass for efficiency (the default implementation reads 1 byte at a time).

Parameters:

b - the buffer into which the data is read

off - the start offset of the data

len - the maximum number of bytes read

Returns:

the actual number of bytes read, -1 is returned when the end of the stream is reached.

Throws: IOException

i/o error occurred

Overrides:

read in class FilterInputStream

unread

  public void unread(int ch)

Pushes back a character.

Parameters:

ch - the character to push back.

Throws: Exception

Attempt to push back more than one character.

currentLine

  public int currentLine()

Returns the current line number.

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