Re: PrintWriter woes

From:

Lew <lew@lewscanon.com>

Newsgroups:

comp.lang.java.programmer

Date:

Sun, 02 Sep 2007 15:16:11 -0400

Message-ID:

<kfOdne1-cLhmlkbbnZ2dnUVZ_tijnZ2d@comcast.com>

Crouchez wrote:

  out = new AnOutputStream( 1024); //buf then set as 1024
  p = new PrintWriter(
   new BufferedWriter(new OutputStreamWriter(
    out,"UTF-8"),1024));

len:8192

when I p.print(somestring) a number of times it pushes the bytes to mystream

a.k.a. "out"

in 8192 chunks. How come when I've set BufferWriter to 4096?

To be clear - you are seeing writes to the underlying stream in 8 KiB chunks?
You aren't measuring the writes in either of the Writers?

Had you considered reading the API docs for OutputStreamWriter?
<http://java.sun.com/javase/6/docs/api/java/io/OutputStreamWriter.html>
wherein it lets you know that:

Each invocation of a write() method causes the encoding converter to be invoked on the given character(s).
The resulting bytes are accumulated in a buffer before being written to the underlying output stream. The size of this buffer may be specified, but by default it is large enough for most purposes.

Dollars to doughnuts the size of that OutputStreamWriter buffer on your system
is 8 KiB. Any takers?

Aren't the API docs wonderful?

--
Lew