# Package org.apache.commons.io.output

This package provides implementations of output classes, such as `OutputStream` and `Writer`.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  AbstractByteArrayOutputStream.InputStreamConstructor<T extends InputStream> | Constructor for an InputStream subclass.

- Class Summary
  Class | Description
  --- | ---
  AbstractByteArrayOutputStream | This is the base class for implementing an output stream in which the data is written into a byte array.
  AppendableOutputStream<T extends Appendable> | OutputStream implementation that writes the data to an `Appendable` Object.
  AppendableWriter<T extends Appendable> | Writer implementation that writes the data to an `Appendable` Object.
  BrokenOutputStream | Broken output stream.
  BrokenWriter | Broken writer.
  ByteArrayOutputStream | Implements a ThreadSafe version of `AbstractByteArrayOutputStream` using instance synchronization.
  ChunkedOutputStream | OutputStream which breaks larger output blocks into chunks.
  ChunkedWriter | Writer which breaks larger output blocks into chunks.
  ClosedOutputStream | Throws an exception on all attempts to write to the stream.
  ClosedWriter | Throws an exception on all attempts to write with `ClosedWriter.close()` implemented as a noop.
  CloseShieldOutputStream | Proxy stream that prevents the underlying output stream from being closed.
  CloseShieldWriter | Proxy writer that prevents the underlying writer from being closed.
  CountingOutputStream | A decorating output stream that counts the number of bytes that have passed through the stream so far.
  DeferredFileOutputStream | An output stream which will retain data in memory until a specified threshold is reached, and only then commit it to disk.
  DemuxOutputStream | Forwards data to a stream that has been associated with this thread.
  FileWriterWithEncoding | Writer of files that allows the encoding to be set.
  FilterCollectionWriter | Abstract class for writing filtered character streams to a `Collection` of writers.
  LockableFileWriter | FileWriter that will create and honor lock files to allow simple cross thread file lock handling.
  NullAppendable | Appends all data to the famous /dev/null.
  NullOutputStream | Writes all data to the famous /dev/null.
  NullPrintStream | Writes all data to the famous /dev/null.
  NullWriter | Writes all data to the famous /dev/null.
  ProxyCollectionWriter | A Proxy stream collection which acts as expected, that is it passes the method calls on to the proxied streams and doesn't change which methods are being called.
  ProxyOutputStream | A Proxy stream which acts as expected, that is it passes the method calls on to the proxied stream and doesn't change which methods are being called.
  ProxyWriter | A Proxy stream which acts as expected, that is it passes the method calls on to the proxied stream and doesn't change which methods are being called.
  QueueOutputStream | Simple alternative to JDK `PipedOutputStream`; queue input stream provides what's written in queue output stream.
  StringBuilderWriter | `Writer` implementation that outputs to a `StringBuilder`.
  TaggedOutputStream | An output stream decorator that tags potential exceptions so that the stream that caused the exception can easily be identified.
  TaggedWriter | A writer decorator that tags potential exceptions so that the reader that caused the exception can easily be identified.
  TeeOutputStream | Classic splitter of `OutputStream`.
  TeeWriter | Classic splitter of `Writer`.
  ThresholdingOutputStream | An output stream which triggers an event when a specified number of bytes of data have been written to it.
  UnsynchronizedByteArrayOutputStream | Implements a version of `AbstractByteArrayOutputStream` without any concurrent thread safety.
  WriterOutputStream | `OutputStream` implementation that transforms a byte stream to a character stream using a specified charset encoding and writes the resulting stream to a `Writer`.
  XmlStreamWriter | Character stream that handles all the necessary Voodoo to figure out the charset encoding of the XML document written to the stream.

## Package org.apache.commons.io.output Description

This package provides implementations of output classes, such as `OutputStream` and `Writer`.

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