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java.lang.Objectjava.io.OutputStream
@TransactionType(value=NOT_SUPPORTED) public abstract class OutputStream
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.
ByteArrayOutputStream
,
DataOutputStream
,
InputStream
,
write(int)
Constructor Summary | |
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OutputStream()
|
Method Summary | |
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void |
close()
Closes this output stream and releases any system resources associated with this stream. |
void |
flush()
Flushes this output stream and forces any buffered output bytes to be written out. |
void |
write(byte[] b)
Writes b.length bytes from the specified byte array to
this output stream. |
void |
write(byte[] b,
int off,
int len)
Writes len bytes from the specified byte array starting at
offset off to this output stream. |
abstract void |
write(int b)
Writes the specified byte to this output stream. |
Methods inherited from class java.lang.Object |
---|
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public OutputStream()
Method Detail |
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public abstract void write(int b) throws IOException
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.
b
- the byte
.
IOException
- if an I/O error occurs. In particular, an
IOException
may be thrown if the output
stream has been closed.public void write(byte[] b) throws IOException
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)
.
b
- the data.
IOException
- if an I/O error occurs.write(byte[], int, int)
public void write(byte[] b, int off, int len) throws IOException
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.
b
- the data.off
- the start offset in the data.len
- the number of bytes to write.
IOException
- if an I/O error occurs. In particular, an
IOException
is thrown if the output stream
is closed.public void flush() throws IOException
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.
The flush
method of OutputStream
does
nothing.
IOException
- if an I/O error occurs.public void close() throws IOException
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.
IOException
- if an I/O error occurs.
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