Appends the specified character to this writer.

  Appends the specified character to this writer.

An invocation of this method of the form out.append(c) behaves in exactly the same way as the invocation

     out.write(c) 

Returns: This writer
Parameters:
- c - The 16-bit character to append
Throws:
- IOException - If an I/O error occurs
Since: 1.5

  Appends the specified character sequence to this writer.

  Appends the specified character sequence to this writer.

An invocation of this method of the form out.append(csq) behaves in exactly the same way as the invocation

     out.write(csq.toString()) 

Depending on the specification of toString for the character sequence csq, the entire sequence may not be appended. For instance, invoking the toString method of a character buffer will return a subsequence whose content depends upon the buffer's position and limit.
Returns: This writer
Parameters:
- csq - The character sequence to append. If csq is null, then the four characters "null" are appended to this writer.
Throws:
- IOException - If an I/O error occurs
Since: 1.5

  Appends a subsequence of the specified character sequence to this writer.

  Appends a subsequence of the specified character sequence to this writer. Appendable.

An invocation of this method of the form out.append(csq, start, end) when csq is not null behaves in exactly the same way as the invocation

     out.write(csq.subSequence(start, end).toString()) 

Returns: This writer
Parameters:
- csq - The character sequence from which a subsequence will be appended. If csq is null, then characters will be appended as if csq contained the four characters "null".
- start - The index of the first character in the subsequence
- end - The index of the character following the last character in the subsequence
Throws:
- IndexOutOfBoundsException - If start or end are negative, start is greater than end, or end is greater than csq.length()
- IOException - If an I/O error occurs
Since: 1.5

  Closes the stream, flushing it first.

  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.
Throws:
- IOException - If an I/O error occurs

  Flushes the stream.

  Flushes the stream. If the stream has saved any characters from the various write() methods in a buffer, write them immediately to their intended destination. Then, if that destination is another character or byte stream, flush it. Thus one flush() invocation will flush all the buffers in a chain of Writers and OutputStreams.

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.
Throws:
- IOException - If an I/O error occurs

  Writes an array of characters.

  Writes an array of characters.
Parameters:
- cbuf - Array of characters to be written
Throws:
- IOException - If an I/O error occurs

  Writes a portion of an array of characters.

  Writes a portion of an array of characters.
Parameters:
- cbuf - Array of characters
- off - Offset from which to start writing characters
- len - Number of characters to write
Throws:
- IOException - If an I/O error occurs

  Writes a single character.

  Writes a single character. The character to be written is contained in the 16 low-order bits of the given integer value; the 16 high-order bits are ignored.

Subclasses that intend to support efficient single-character output should override this method.
Parameters:
- c - int specifying a character to be written
Throws:
- IOException - If an I/O error occurs

  Writes a string.

  Writes a string.
Parameters:
- str - String to be written
Throws:
- IOException - If an I/O error occurs

  Writes a portion of a string.

  Writes a portion of a string.
Parameters:
- str - A String
- off - Offset from which to start writing characters
- len - Number of characters to write
Throws:
- IndexOutOfBoundsException - If off is negative, or len is negative, or off+len is negative or greater than the length of the given string
- IOException - If an I/O error occurs