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Showing content from https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/FilterOutputStream.html below:

FilterOutputStream (Java SE 17 & JDK 17)

All Implemented Interfaces:

Closeable, Flushable, AutoCloseable

Direct Known Subclasses:

BufferedOutputStream, CheckedOutputStream, CipherOutputStream, DataOutputStream, DeflaterOutputStream, DigestOutputStream, InflaterOutputStream, PrintStream

This class is the superclass of all classes that filter output streams. These streams sit on top of an already existing output stream (the

output stream) which it uses as its basic sink of data, but possibly transforming the data along the way or providing additional functionality.

The class FilterOutputStream itself simply overrides all methods of OutputStream with versions that pass all requests to the underlying output stream. Subclasses of FilterOutputStream may further override some of these methods as well as provide additional methods and fields.

Since:

1.0

• Field Summary

  Fields

  The underlying output stream to be filtered.

• Constructor Summary

  Constructors

  Creates an output stream filter built on top of the specified underlying output stream.

• Method Summary

  void

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

  void

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

  void

  Writes b.length bytes 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.

  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

• Field Details
  • out

    The underlying output stream to be filtered.

• Constructor Details
  • FilterOutputStream

    Creates an output stream filter built on top of the specified underlying output stream.

    Parameters:

    out - the underlying output stream to be assigned to the field this.out for later use, or null if this instance is to be created without an underlying stream.

• Method Details
  • write

    Writes the specified

    byte

    to this output stream.

    The write method of FilterOutputStream calls the write method of its underlying output stream, that is, it performs out.write(b).

    Implements the abstract write method of OutputStream.

    Specified by:

    write in class OutputStream

    Parameters:

    b - the byte.

    Throws:

    IOException - if an I/O error occurs.

  • write

    Writes

    b.length

    bytes to this output stream.

    The write method of FilterOutputStream calls its write method of three arguments with the arguments b, 0, and b.length.

    Note that this method does not call the one-argument write method of its underlying output stream with the single argument b.

    Overrides:

    write in class OutputStream

    Parameters:

    b - the data to be written.

    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 write method of FilterOutputStream calls the write method of one argument on each byte to output.

    Note that this method does not call the write method of its underlying output stream with the same arguments. Subclasses of FilterOutputStream should provide a more efficient implementation of this method.

    Overrides:

    write in class OutputStream

    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.

    See Also:

    • write(int)

  • flush

    The flush method of FilterOutputStream calls the flush method of its underlying output stream.

    Specified by:

    flush in interface Flushable

    Overrides:

    flush in class OutputStream

    Throws:

    IOException - if an I/O error occurs.

    See Also:

    • out

  • close

    When not already closed, the close method of FilterOutputStream calls its flush method, and then calls the close method of its underlying output stream.

    Specified by:

    close in interface AutoCloseable

    Specified by:

    close in interface Closeable

    Overrides:

    close in class OutputStream

    Throws:

    IOException - if an I/O error occurs.

    See Also:

    • flush()
    • out

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