OutputStreampublic abstract class OutputStream extends Object implements Closeable, Flushable| This abstract class is the superclass of all classes representing
an output stream of bytes. An output stream accepts output bytes
and sends them to some sink.
Applications that need to define a subclass of
OutputStream must always provide at least a method
that writes one byte of output. |
| Methods Summary |
|---|
| public void | close()Closes this output stream and releases any system resources
associated with this stream. The general contract of close
is that it closes the output stream. A closed stream cannot perform
output operations and cannot be reopened.
The close method of OutputStream does nothing.
| | public void | flush()Flushes this output stream and forces any buffered output bytes
to be written out. The general contract of flush is
that calling it is an indication that, if any bytes previously
written have been buffered by the implementation of the output
stream, such bytes should immediately be written to their
intended destination.
If the intended destination of this stream is an abstraction provided by
the underlying operating system, for example a file, then flushing the
stream guarantees only that bytes previously written to the stream are
passed to the operating system for writing; it does not guarantee that
they are actually written to a physical device such as a disk drive.
The flush method of OutputStream does nothing.
| | public abstract void | write(int b)Writes the specified byte to this output stream. The general
contract for write is that one byte is written
to the output stream. The byte to be written is the eight
low-order bits of the argument b. The 24
high-order bits of b are ignored.
Subclasses of OutputStream must provide an
implementation for this method.
| | public void | write(byte[] b)Writes b.length bytes from the specified byte array
to this output stream. The general contract for write(b)
is that it should have exactly the same effect as the call
write(b, 0, b.length).
write(b, 0, b.length);
| | public void | write(byte[] b, int off, int len)Writes len bytes from the specified byte array
starting at offset off to this output stream.
The general contract for write(b, off, len) is that
some of the bytes in the array b are written to the
output stream in order; element b[off] is the first
byte written and b[off+len-1] is the last byte written
by this operation.
The write method of OutputStream calls
the write method of one argument on each of the bytes to be
written out. Subclasses are encouraged to override this method and
provide a more efficient implementation.
If b is null, a
NullPointerException is thrown.
If off is negative, or len is negative, or
off+len is greater than the length of the array
b, then an IndexOutOfBoundsException is thrown.
if (b == null) {
throw new NullPointerException();
} else if ((off < 0) || (off > b.length) || (len < 0) ||
((off + len) > b.length) || ((off + len) < 0)) {
throw new IndexOutOfBoundsException();
} else if (len == 0) {
return;
}
for (int i = 0 ; i < len ; i++) {
write(b[off + i]);
}
|
|
