Java IO.pdf - Nguyen Dang Binh

PipedReader pr = new PipedReader();
PipedWriter pw = new PipedWriter(pr);
Java I/O
Or you can create them both unconnected, then use one or the other's connect() method to
link them:
public void connect(PipedReader sink) throws IOException
public void connect(PipedWriter source) throws IOException
PipedWriter's connect() method takes as an argument the PipedReader to connect to.
PipedReader's connect() argument takes as an argument the PipedWriter to connect to:
PipedReader pr = new PipedReader();
PipedWriter pw = new PipedWriter();
pr.connect(pw);
or:
PipedReader pr = new PipedReader();
PipedWriter pw = new PipedWriter();
pw.connect(pr);
Neither a PipedWriter nor a PipedReader may be connected to more than one reader or
writer. Attempts to do so throw IOExceptions. Furthermore, once connected, a
PipedWriter/PipedReader pair may not be disconnected. Otherwise, these classes have the
usual read(), write(), flush(), close(), and ready() methods like all reader and writer
classes. These are the remaining declared methods in PipedWriter:
public void write(char[] text, int offset, int length) throws IOException
public void flush() throws IOException
public void close() throws IOException
When characters are written on the PipedWriter, that text becomes available as input to be
read by the connected PipedReader. If a PipedReader tries to read characters, but its
connected PipedWriter hasn't yet provided it with any, the PipedReader blocks.
These are the remaining declared methods in PipedReader:
public int read(char[] text, int offset, int length) throws IOException
public void close() throws IOException
Closing either a PipedReader or a PipedWriter also closes the reader or writer it's connected
to.
15.11 Filtered Readers and Writers
The java.io.FilterReader and java.io.FilterWriter classes are abstract classes that
read characters and filter them in some way before passing the text along. You can imagine a
FilterReader that converts all characters to uppercase.
public abstract class FilterReader extends Reader
public abstract class FilterWriter extends Writer
381