Java Reference
In-Depth Information
public void
write(byte[] buf)
throws IOException
Equivalent to
write(buf,0, buf.length)
.
public void
flush()
throws IOException
Flushes the stream. If the stream has buffered any bytes from
the various
write
methods,
flush
writes them immediately to
their destination. Then, if that destination is another stream,
it is also flushed. One
flush
invocation will flush all the buffers
in a chain of streams. If the stream is not buffered,
flush
may
do nothingthe default implementation. This method is defined
in the
Flushable
interface.
public void
close()
tHRows IOException
Closes the output stream. This method should be invoked to
release any resources (such as file descriptors) associated
with the stream. Once a stream has been closed, further oper-
ations on the stream will throw an
IOException
. Closing a pre-
viously closed stream has no effect.The default implementa-
tion of
close
does nothing.
The implementation of
OutputStream
requires only that a subclass provide
the single-byte variant of
write
because the other
write
methods are
defined in terms of this one. Most streams, however, can improve per-
formance by overriding other methods as well. The default implementa-
tions of
flush
and
close
will usually need to be overridden as appropriate
for a particular streamin particular, buffered streams may need to flush
when closed.
Here is a program that copies its input to its output, translating one par-
ticular byte value to a different one along the way. The
TRanslateByte
program takes two parameters: a
from
byte and a
to
byte. Bytes that
match the value in the string
from
are translated into the value in the
string
to
.
