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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
A character-stream reader that allows characters to be pushed back into the stream.

Constructor Index

o PushbackReader(Reader)
Create a new pushback reader with a one-character pushback buffer.
o PushbackReader(Reader, int)
Create a new pushback reader with a pushback buffer of the given size.

Method Index

o close()
Close the stream.
o markSupported()
Tell whether this stream supports the mark() operation, which it does not.
o read()
Read a single character.
o read(char[], int, int)
Read characters into a portion of an array.
o ready()
Tell whether this stream is ready to be read.
o unread(char[])
Push back an entire array of characters.
o unread(char[], int, int)
Push back from an array of characters.
o unread(int)
Push back a single character.

Constructors

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

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

Methods

o 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
o read 
 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
o unread 
 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
o unread 
 public void unread(char cbuf[],
                    int off,
                    int len) throws IOException
Push back from an array of characters.

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
o unread 
 public void unread(char cbuf[]) throws IOException
Push back an entire array of characters.

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

Overrides:
markSupported in class FilterReader
o close 
 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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