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## java.io
Class FilterWriter

    java.lang.Object
      java.io.Writer
          java.io.FilterWriter

All Implemented Interfaces:
  Closeable, Flushable, Appendable

    public abstract class FilterWriter

extends Writer

Abstract class for writing filtered character streams. The abstract class `FilterWriter` itself provides default methods that pass all requests to the contained stream. Subclasses of `FilterWriter` should override some of these methods and may also provide additional methods and fields.

Since:
  JDK1.1

Field Summary
`protected Writer` | `out` The underlying character-output stream.

Fields inherited from class java.io.Writer
`lock`

Constructor Summary
`protected` | `FilterWriter(Writer out)` Create a new filtered writer.

Method Summary
`void` | `close()` Closes the stream, flushing it first.
`void` | `flush()` Flushes the stream.
`void` | `write(char[] cbuf, int off, int len)` Writes a portion of an array of characters.
`void` | `write(int c)` Writes a single character.
`void` | `write(String str, int off, int len)` Writes a portion of a string.

Methods inherited from class java.io.Writer
`append, append, append, write, write`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### out

    protected Writer out

  The underlying character-output stream.

Constructor Detail

### FilterWriter

    protected FilterWriter(Writer out)

  Create a new filtered writer.

  Parameters:
    `out` - a Writer object to provide the underlying stream.
  Throws:
    `NullPointerException` - if `out` is `null`

Method Detail

### write

    public void write(int c)
               throws IOException

  Writes a single character.

  Overrides:
    `write` in class `Writer`
  Parameters:
    `c` - int specifying a character to be written
  Throws:
    `IOException` - If an I/O error occurs

### write

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

  Writes a portion of an array of characters.

  Specified by:
    `write` in class `Writer`
  Parameters:
    `cbuf` - Buffer of characters to be written
    `off` - Offset from which to start reading characters
    `len` - Number of characters to be written
  Throws:
    `IOException` - If an I/O error occurs

### write

    public void write(String str,
                      int off,
                      int len)
               throws IOException

  Writes a portion of a string.

  Overrides:
    `write` in class `Writer`
  Parameters:
    `str` - String to be written
    `off` - Offset from which to start reading characters
    `len` - Number of characters to be written
  Throws:
    `IOException` - If an I/O error occurs

### flush

    public void flush()
               throws IOException

  Flushes the stream.

  Specified by:
    `flush` in interface `Flushable`
  Specified by:
    `flush` in class `Writer`
  Throws:
    `IOException` - If an I/O error occurs

### close

    public void close()
               throws IOException

  Description copied from class: `Writer`
  Closes the stream, flushing it first. Once the stream has been closed, further write() or flush() invocations will cause an IOException to be thrown. Closing a previously closed stream has no effect.

  Specified by:
    `close` in interface `Closeable`
  Specified by:
    `close` in class `Writer`
  Throws:
    `IOException` - If an I/O error occurs

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