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Showing content from https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/OutputStream.html below:

OutputStream (Java SE 21 & JDK 21)

All Implemented Interfaces:

Closeable, Flushable, AutoCloseable

Direct Known Subclasses:

ByteArrayOutputStream, FileOutputStream, FilterOutputStream, ObjectOutputStream, PipedOutputStream

Applications that need to define a subclass of OutputStream must always provide at least a method that writes one byte of output.

Since:

1.0

See Also:

• BufferedOutputStream
• ByteArrayOutputStream
• DataOutputStream
• FilterOutputStream
• InputStream
• write(int)

• Constructor Summary

  Constructors

  Constructor for subclasses to call.

• Method Summary

  void

  Closes this output stream and releases any system resources associated with this stream.

  void

  Flushes this output stream and forces any buffered output bytes to be written out.

  Returns a new OutputStream which discards all bytes.

  void

  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

  Writes the specified byte to this output stream.

  Methods declared in class java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

• Constructor Details
  • OutputStream

    public OutputStream()

    Constructor for subclasses to call.

• Method Details
  • nullOutputStream

    Returns a new

    OutputStream

    which discards all bytes. The returned stream is initially open. The stream is closed by calling the

    close()

    method. Subsequent calls to

    close()

    have no effect.

    While the stream is open, the write(int), write(byte[]), and write(byte[], int, int) methods do nothing. After the stream has been closed, these methods all throw IOException.

    The flush() method does nothing.

    Returns:

    an OutputStream which discards all bytes

    Since:

    11

  • write

    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.

    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.

  • write

    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:

    • write(byte[], int, int)

  • write public void write(byte[] b, int off, int len)

    throws

    IOException

    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.

    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.

    API Note:

    Subclasses are encouraged to override this method and provide a more efficient implementation.

    Implementation Requirements:

    The write method of OutputStream calls the write method of one argument on each of the bytes to be written out.

    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.

    IndexOutOfBoundsException - If off is negative, len is negative, or len is greater than b.length - off

  • 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.

    Specified by:

    flush in interface Flushable

    Implementation Requirements:

    The flush method of OutputStream does nothing.

    Throws:

    IOException - if an I/O error occurs.

  • 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.

    Specified by:

    close in interface AutoCloseable

    Specified by:

    close in interface Closeable

    Implementation Requirements:

    The close method of OutputStream does nothing.

    Throws:

    IOException - if an I/O error occurs.

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