public class PushbackReader extends FilterReader
in| Constructor and Description |
|---|
PushbackReader(Reader in)
Creates a new pushback reader with a one-character pushback buffer.
|
PushbackReader(Reader in,
int size)
Creates a new pushback reader with a pushback buffer of the given size.
|
| Modifier and Type | Method and Description |
|---|---|
void |
close()
Closes the stream and releases any system resources associated with
it.
|
void |
mark(int readAheadLimit)
Marks the present position in the stream.
|
boolean |
markSupported()
Tells whether this stream supports the mark() operation, which it does
not.
|
int |
read()
Reads a single character.
|
int |
read(char[] cbuf,
int off,
int len)
Reads characters into a portion of an array.
|
boolean |
ready()
Tells whether this stream is ready to be read.
|
void |
reset()
Resets the stream.
|
long |
skip(long n)
Skips characters.
|
void |
unread(char[] cbuf)
Pushes back an array of characters by copying it to the front of the
pushback buffer.
|
void |
unread(char[] cbuf,
int off,
int len)
Pushes back a portion of an array of characters by copying it to the
front of the pushback buffer.
|
void |
unread(int c)
Pushes back a single character by copying it to the front of the
pushback buffer.
|
public PushbackReader(Reader in, int size)
in - The reader from which characters will be readsize - The size of the pushback bufferIllegalArgumentException - if size <= 0public PushbackReader(Reader in)
in - The reader from which characters will be readpublic int read()
throws IOException
read in class FilterReaderIOException - If an I/O error occurspublic int read(char[] cbuf,
int off,
int len)
throws IOException
read in class FilterReadercbuf - Destination bufferoff - Offset at which to start writing characterslen - Maximum number of characters to readIOException - If an I/O error occurspublic void unread(int c)
throws IOException
(char)c.c - The int value representing a character to be pushed backIOException - If the pushback buffer is full,
or if some other I/O error occurspublic void unread(char[] cbuf,
int off,
int len)
throws IOException
cbuf[off], the
character after that will have the value cbuf[off+1], and
so forth.cbuf - Character arrayoff - Offset of first character to push backlen - Number of characters to push backIOException - If there is insufficient room in the pushback
buffer, or if some other I/O error occurspublic void unread(char[] cbuf)
throws IOException
cbuf[0], the character after that
will have the value cbuf[1], and so forth.cbuf - Character array to push backIOException - If there is insufficient room in the pushback
buffer, or if some other I/O error occurspublic boolean ready()
throws IOException
ready in class FilterReaderIOException - If an I/O error occurspublic void mark(int readAheadLimit)
throws IOException
mark
for class PushbackReader always throws an exception.mark in class FilterReaderreadAheadLimit - 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.IOException - Always, since mark is not supportedpublic void reset()
throws IOException
reset method of
PushbackReader always throws an exception.reset in class FilterReaderIOException - Always, since reset is not supportedpublic boolean markSupported()
markSupported in class FilterReaderpublic void close()
throws IOException
close in interface Closeableclose in interface AutoCloseableclose in class FilterReaderIOException - If an I/O error occurspublic long skip(long n)
throws IOException
skip in class FilterReadern - The number of characters to skipIllegalArgumentException - If n is negative.IOException - If an I/O error occurs Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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