| java.lang.Object | |
| ↳ | java.io.OutputStream |
 Known Direct Subclasses
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Class Overview
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.
Summary
| Public Constructors | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| OutputStream() | |||||||||||
| Public Methods | |||||||||||
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| void |
close()
Closes this output stream and releases any system resources associated with
this stream.
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| void |
flush()
Flushes this output stream and forces any buffered output bytes to be written
out.
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| 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.
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[Expand]
Inherited Methods | |||||||||||
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From class
java.lang.Object
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Public Constructors
public OutputStream ()
Public Methods
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.
Throws
| IOException | if an I/O error occurs. |
|---|
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.
The flush method of OutputStream does nothing.
Throws
| IOException | if an I/O error occurs. |
|---|
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).
Parameters
| b | the data. |
|---|
Throws
| IOException | if an I/O error occurs. |
|---|
See Also
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.
Parameters
| b | the data. |
|---|---|
| off | the start offset in the data. |
| len | the number of bytes to write. |
Throws
| IOException | if an I/O error occurs. In particular, an
IOException is thrown if the output stream is
closed.
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|---|
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.
Parameters
| b | the byte. |
|---|
Throws
| IOException | if an I/O error occurs. In particular, an
IOException may be thrown if the output stream
has been closed.
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