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java.io
Class FilterReader
java.lang.Object
java.io.Reader
java.io.FilterReader
-
All Implemented Interfaces:
-
Closeable
,
Readable
-
Direct Known Subclasses:
-
PushbackReader
-
public abstract class FilterReader
- extends Reader
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.
-
Since:
-
JDK1.1
Field Summary
|
protected
Reader
|
in
The underlying character-input stream. |
Method Summary
|
void |
close
()
Closes
Close
the
stream and releases any system resources associated with it.
stream.
|
void |
mark
(int readAheadLimit)
Marks
Mark
the present position in the stream. |
boolean |
markSupported
()
Tells
Tell
whether this stream supports the mark() operation. |
int |
read
()
Reads
Read
a single character. |
int |
read
(char[] cbuf, int off, int len)
Reads
Read
characters into a portion of an array. |
boolean |
ready
()
Tells
Tell
whether this stream is ready to be read. |
void |
reset
()
Resets
Reset
the stream. |
long |
skip
(long n)
Skips
Skip
characters. |
Methods inherited from class java.lang.
Object
|
clone
,
equals
,
finalize
,
getClass
,
hashCode
,
notify
,
notifyAll
,
toString
,
wait
,
wait
,
wait
|
in
protected Reader in
-
The underlying character-input stream.
FilterReader
protected FilterReader(Reader in)
-
Creates
Create
a new filtered reader.
-
Parameters:
-
in - a Reader object providing the underlying stream.
-
Throws:
-
NullPointerException
- if in is null
read
public int read()
throws IOException
-
Reads
Read
a single character.
-
-
Overrides:
-
read
in class
Reader
-
-
Returns:
-
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
-
Throws:
-
IOException
- If an I/O error occurs
read
public int read(char[] cbuf,
int off,
int len)
throws IOException
-
Reads
Read
characters into a portion of an array.
-
-
Specified by:
-
read
in class
Reader
-
-
Parameters:
-
cbuf - Destination buffer
-
off - Offset at which to start storing 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
skip
public long skip(long n)
throws IOException
-
Skips
Skip
characters.
-
-
Overrides:
-
skip
in class
Reader
-
-
Parameters:
-
n - The number of characters to skip
-
Returns:
-
The number of characters actually skipped
-
Throws:
-
IOException
- If an I/O error occurs
ready
public boolean ready()
throws IOException
-
Tells
Tell
whether this stream is ready to be read.
-
-
Overrides:
-
ready
in class
Reader
-
-
Returns:
-
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.
-
Throws:
-
IOException
- If an I/O error occurs
markSupported
public boolean markSupported()
-
Tells
Tell
whether this stream supports the mark() operation.
-
-
Overrides:
-
markSupported
in class
Reader
-
-
Returns:
-
true if and only if this stream supports the mark operation.
mark
public void mark(int readAheadLimit)
throws IOException
-
Marks
Mark
the present position in the stream.
-
-
Overrides:
-
mark
in class
Reader
-
-
Parameters:
-
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.
-
Throws:
-
IOException
- If an I/O error occurs
reset
public void reset()
throws IOException
-
Resets
Reset
the stream.
-
-
Overrides:
-
reset
in class
Reader
-
-
Throws:
-
IOException
- If an I/O error occurs
close
public void close()
throws IOException
-
Description copied from class:
Reader
-
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.
Close the stream.
-
-
Specified by:
-
close
in interface
Closeable
-
Specified by:
-
close
in class
Reader
-
-
Throws:
-
IOException
- If an I/O error occurs