java.io

## Class PipedWriter

- java.lang.Object
- - java.io.Writer
  - - java.io.PipedWriter

- All Implemented Interfaces:
    Closeable, Flushable, Appendable, AutoCloseable

      public class PipedWriter
      extends Writer

  Piped character-output streams.
  Since:
    JDK1.1

- - ### Field Summary

    - ### Fields inherited from class java.io.Writer

      `lock`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `PipedWriter()` Creates a piped writer that is not yet connected to a piped reader.
    `PipedWriter(PipedReader snk)` Creates a piped writer connected to the specified piped reader.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `close()` Closes this piped output stream and releases any system resources associated with this stream.
    `void` | `connect(PipedReader snk)` Connects this piped writer to a receiver.
    `void` | `flush()` Flushes this output stream and forces any buffered output characters to be written out.
    `void` | `write(char[] cbuf, int off, int len)` Writes `len` characters from the specified character array starting at offset `off` to this piped output stream.
    `void` | `write(int c)` Writes the specified `char` to the piped output stream.

    - ### Methods inherited from class java.io.Writer

      `append, append, append, write, write, write`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### PipedWriter

          public PipedWriter(PipedReader snk)
                      throws IOException

      Creates a piped writer connected to the specified piped reader. Data characters written to this stream will then be available as input from `snk`.
      Parameters:
        `snk` - The piped reader to connect to.
      Throws:
        `IOException` - if an I/O error occurs.

    - #### PipedWriter

          public PipedWriter()

      Creates a piped writer that is not yet connected to a piped reader. It must be connected to a piped reader, either by the receiver or the sender, before being used.
      See Also:
        `PipedReader.connect(java.io.PipedWriter)`, `connect(java.io.PipedReader)`

  - ### Method Detail

    - #### connect

          public void connect(PipedReader snk)
                       throws IOException

      Connects this piped writer to a receiver. If this object is already connected to some other piped reader, an `IOException` is thrown.

      If `snk` is an unconnected piped reader and `src` is an unconnected piped writer, they may be connected by either the call:

      >      src.connect(snk)

      or the call:

      >      snk.connect(src)

      The two calls have the same effect.
      Parameters:
        `snk` - the piped reader to connect to.
      Throws:
        `IOException` - if an I/O error occurs.

    - #### write

          public void write(int c)
                     throws IOException

      Writes the specified `char` to the piped output stream. If a thread was reading data characters from the connected piped input stream, but the thread is no longer alive, then an `IOException` is thrown.

      Implements the `write` method of `Writer`.

      Overrides:
        `write` in class `Writer`
      Parameters:
        `c` - the `char` to be written.
      Throws:
        `IOException` - if the pipe is `broken`, `unconnected`, closed or an I/O error occurs.

    - #### write

          public void write(char[] cbuf,
                   int off,
                   int len)
                     throws IOException

      Writes `len` characters from the specified character array starting at offset `off` to this piped output stream. This method blocks until all the characters are written to the output stream. If a thread was reading data characters from the connected piped input stream, but the thread is no longer alive, then an `IOException` is thrown.
      Specified by:
        `write` in class `Writer`
      Parameters:
        `cbuf` - the data.
        `off` - the start offset in the data.
        `len` - the number of characters to write.
      Throws:
        `IOException` - if the pipe is `broken`, `unconnected`, closed or an I/O error occurs.

    - #### flush

          public void flush()
                     throws IOException

      Flushes this output stream and forces any buffered output characters to be written out. This will notify any readers that characters are waiting in the pipe.
      Specified by:
        `flush` in interface `Flushable`
      Specified by:
        `flush` in class `Writer`
      Throws:
        `IOException` - if the pipe is closed, or an I/O error occurs.

    - #### close

          public void close()
                     throws IOException

      Closes this piped output stream and releases any system resources associated with this stream. This stream may no longer be used for writing characters.
      Specified by:
        `close` in interface `Closeable`
      Specified by:
        `close` in interface `AutoCloseable`
      Specified by:
        `close` in class `Writer`
      Throws:
        `IOException` - if an I/O error occurs.

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