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• java
• j2se
• 1.5
• java.io
• PushbackReader

Methods

• PushbackReadertop

  public PushbackReader(Reader in)
  Create a new pushback reader with a one-character pushback buffer.

  Parameters:

  @param in The reader from which characters will be read

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• PushbackReadertop

  public PushbackReader(Reader in, int size)
  Create a new pushback reader with a pushback buffer of the given size.

  Parameters:

  @param in The reader from which characters will be read

  @param size The size of the pushback buffer

  Exceptions:

  @exception IllegalArgumentException if size is <_ _0="_0" dd="dd">

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• closetop

  public void close() throws IOException
  Close the stream.

  Exceptions:

  @exception IOException If an I/O error occurs

  Specified by:

  close from Closeable

  Override hierarchy:

  close from FilterReader

  close from Reader

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• marktop

  public void mark(int readAheadLimit) throws IOException
  Mark the present position in the stream. The mark for class PushbackReader always throws an exception.

  Parameters:

  @param 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.

  Exceptions:

  @exception IOException Always, since mark is not supported

  Override hierarchy:

  mark from FilterReader

  mark from Reader

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• markSupportedtop

  public boolean markSupported()
  Tell whether this stream supports the mark() operation, which it does not.

  Return:

  @return true if and only if this stream supports the mark operation.

  Override hierarchy:

  markSupported from FilterReader

  markSupported from Reader

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• readtop

  public int read() throws IOException
  Read a single character.

  Return:

  @return The character read, or -1 if the end of the stream has been reached

  Exceptions:

  @exception IOException If an I/O error occurs

  Override hierarchy:

  read from FilterReader

  read from Reader

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• readtop

  public int read(char[] cbuf, int off, int len) throws IOException
  Read characters into a portion of an array.

  Parameters:

  @param cbuf Destination buffer

  @param off Offset at which to start writing characters

  @param len Maximum number of characters to read

  Return:

  @return The number of characters read, or -1 if the end of the stream has been reached

  Exceptions:

  @exception IOException If an I/O error occurs

  Override hierarchy:

  read from FilterReader

  read from Reader

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• readytop

  public boolean ready() throws IOException
  Tell whether this stream is ready to be read.

  Return:

  @return True if the next read() is guaranteed not to block for input, false otherwise. Note that returning false does not guarantee that the next read will block.

  Exceptions:

  @exception IOException If an I/O error occurs

  Override hierarchy:

  ready from FilterReader

  ready from Reader

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• resettop

  public void reset() throws IOException
  Reset the stream. The reset method of PushbackReader always throws an exception.

  Exceptions:

  @exception IOException Always, since reset is not supported

  Override hierarchy:

  reset from FilterReader

  reset from Reader

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• skiptop

  public long skip(long n) throws IOException
  Skip characters. This method will block until some characters are available, an I/O error occurs, or the end of the stream is reached.

  Parameters:

  @param n The number of characters to skip

  Return:

  @return The number of characters actually skipped

  Exceptions:

  @exception IllegalArgumentException If n is negative.

  @exception IOException If an I/O error occurs

  Override hierarchy:

  skip from FilterReader

  skip from Reader

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• unreadtop

  public void unread(int c) throws IOException
  Push back a single character.

  Parameters:

  @param c The character to push back

  Exceptions:

  @exception IOException If the pushback buffer is full, or if some other I/O error occurs

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• unreadtop

  public void unread(char[] cbuf) throws IOException
  Push back an array of characters by copying it to the front of the pushback buffer. After this method returns, the next character to be read will have the value cbuf[0], the character after that will have the value cbuf[1], and so forth.

  Parameters:

  @param cbuf Character array to push back

  Exceptions:

  @exception IOException If there is insufficient room in the pushback buffer, or if some other I/O error occurs

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• unreadtop

  public void unread(char[] cbuf, int off, int len) throws IOException
  Push back a portion of an array of characters by copying it to the front of the pushback buffer. After this method returns, the next character to be read will have the value cbuf[off], the character after that will have the value cbuf[off+1], and so forth.

  Parameters:

  @param cbuf Character array

  @param off Offset of first character to push back

  @param len Number of characters to push back

  Exceptions:

  @exception IOException If there is insufficient room in the pushback buffer, or if some other I/O error occurs

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