FilterReader
public
abstract
class
FilterReader
extends Reader
Known direct subclasses
| PushbackReader |
A character-stream reader that allows characters to be pushed back into the
stream.
|
|
Abstract class for reading filtered character streams.
The abstract class FilterReader itself
provides default methods that pass all requests to
the contained stream. Subclasses of FilterReader
should override some of these methods and may also provide
additional methods and fields.
Summary
Fields |
|---|
protected
Reader |
in
The underlying character-input stream.
|
Public methods |
|---|
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.
|
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.
|
Inherited methods |
|---|
From class
java.io.Reader
abstract
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.
|
static
Reader
|
nullReader()
Returns a new Reader that reads no characters.
|
int
|
read()
Reads a single character.
|
abstract
int
|
read(char[] cbuf, int off, int len)
Reads characters into a portion of an array.
|
int
|
read(char[] cbuf)
Reads characters into an array.
|
int
|
read(CharBuffer target)
Attempts to read characters into the specified character buffer.
|
boolean
|
ready()
Tells whether this stream is ready to be read.
|
void
|
reset()
Resets the stream.
|
long
|
skip(long n)
Skips characters.
|
long
|
transferTo(Writer out)
Reads all characters from this reader and writes the characters to the
given writer in the order that they are read.
|
|
From class
java.lang.Object
Object
|
clone()
Creates and returns a copy of this object.
|
boolean
|
equals(Object obj)
Indicates whether some other object is "equal to" this one.
|
void
|
finalize()
Called by the garbage collector on an object when garbage collection
determines that there are no more references to the object.
|
final
Class<?>
|
getClass()
Returns the runtime class of this Object.
|
int
|
hashCode()
Returns a hash code value for the object.
|
final
void
|
notify()
Wakes up a single thread that is waiting on this object's
monitor.
|
final
void
|
notifyAll()
Wakes up all threads that are waiting on this object's monitor.
|
String
|
toString()
Returns a string representation of the object.
|
final
void
|
wait(long timeoutMillis, int nanos)
Causes the current thread to wait until it is awakened, typically
by being notified or interrupted, or until a
certain amount of real time has elapsed.
|
final
void
|
wait(long timeoutMillis)
Causes the current thread to wait until it is awakened, typically
by being notified or interrupted, or until a
certain amount of real time has elapsed.
|
final
void
|
wait()
Causes the current thread to wait until it is awakened, typically
by being notified or interrupted.
|
|
From interface
java.io.Closeable
abstract
void
|
close()
Closes this stream and releases any system resources associated
with it.
|
|
|
|
|
|
Fields
in
protected Reader in
The underlying character-input stream.
Protected constructors
FilterReader
protected FilterReader (Reader in)
Creates a new filtered reader.
| Parameters |
|---|
in |
Reader: a Reader object providing the underlying stream. |
Public methods
close
public void close ()
Closes the stream and releases any system resources associated with
it. Once the stream has been closed, further read(), ready(),
mark(), reset(), or skip() invocations will throw an IOException.
Closing a previously closed stream has no effect.
mark
public void mark (int readAheadLimit)
Marks the present position in the stream.
| Parameters |
|---|
readAheadLimit |
int: 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. |
markSupported
public boolean markSupported ()
Tells whether this stream supports the mark() operation.
| Returns |
|---|
boolean |
true if and only if this stream supports the mark operation. |
read
public int read ()
Reads a single character.
| Returns |
|---|
int |
The character read, as an integer in the range 0 to 65535
(0x00-0xffff), or -1 if the end of the stream has
been reached |
read
public int read (char[] cbuf,
int off,
int len)
Reads characters into a portion of an array.
| Parameters |
|---|
cbuf |
char: Destination buffer |
off |
int: Offset at which to start storing characters |
len |
int: Maximum number of characters to read |
| Returns |
|---|
int |
The number of characters read, or -1 if the end of the
stream has been reached |
ready
public boolean ready ()
Tells whether this stream is ready to be read.
| Returns |
|---|
boolean |
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. |
reset
public void reset ()
Resets the stream.
skip
public long skip (long n)
Skips characters.
| Parameters |
|---|
n |
long: The number of characters to skip |
| Returns |
|---|
long |
The number of characters actually skipped |
