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Class java.io.PushbackReader

java.lang.Object
   |
   +----java.io.Reader
           |
           +----java.io.FilterReader
                   |
                   +----java.io.PushbackReader

public class PushbackReader

extends FilterReader

PushbackReader(Reader)

Create a new pushback reader with a one-character pushback buffer.

PushbackReader(Reader, int)

Create a new pushback reader with a pushback buffer of the given size.

close()

Close the stream.

markSupported()

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

read()

Read a single character.

read(char[], int, int)

Read characters into a portion of an array.

ready()

Tell whether this stream is ready to be read.

unread(char[])

Push back an array of characters by copying it to the front of the pushback buffer.

unread(char[], int, int)

Push back a portion of an array of characters by copying it to the front of the pushback buffer.

unread(int)

Push back a single character.

 public PushbackReader(Reader in,
                       int size)

Create a new pushback reader with a pushback buffer of the given size.

Parameters:

in - The reader from which characters will be read

size - The size of the pushback buffer

 public PushbackReader(Reader in)

Create a new pushback reader with a one-character pushback buffer.

Parameters:

in - The reader from which characters will be read

 public int read() throws IOException

Read a single character.

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 FilterReader

 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 writing characters

len - Maximum number of characters to read

Returns:

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

Throws: IOException

If an I/O error occurs

Overrides:

read in class FilterReader

 public void unread(int c) throws IOException

Push back a single character.

Parameters:

c - The character to push back

Throws: IOException

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

 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:

cbuf - Character array

off - Offset of first character to push back

len - Number of characters to push back

Throws: IOException

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

 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:

cbuf - Character array to push back

Throws: IOException

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

 public boolean ready() throws IOException

Tell whether this stream is ready to be read.

Throws: IOException

If an I/O error occurs

Overrides:

ready in class FilterReader

 public boolean markSupported()

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

Overrides:

markSupported in class FilterReader

 public void close() throws IOException

Close the stream.

Throws: IOException

If an I/O error occurs

Overrides:

close in class FilterReader

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