[jdjlist] RE: Java IO Question

Yan, Hong [IT] Wed, 21 Aug 2002 10:50:52 -0700

Title: RE: [jdjlist] RE: Java IO Question

The design of IO pakcage in Java follows two design patterns: decorator and adatper.

FileWriter("fileName") wraps a File object into a FileWriter stream, therefore it is an adapter

BufferWriter( Writer ) adds buffering capability to the Writer, which is a decorator pattern

PrintWriter( Writer) again is a decorator.

You will also see a symmtry in In and Out, 8bit and 16bit. Once you have these in mind, you may change your mind toward the design of Java io package. I would say it is probably the best IO package ever designed.

rgds

Jeff

-----Original Message-----
From: Greg Nudelman [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, August 21, 2002 2:03 PM
To: JDJList
Subject: [jdjlist] RE: Java IO Question

This is one of a few things I find of extreme annoyance in Java. I do not think any other modern programming language makes you remember:

new PrintWriter(new BufferedWriter(new FileWriter("foo.out")));

just to get a file handle!! (This is one area where C syntax may even be easier to remember then Java... Scary!)

I can never remember the syntax, as I have to write to a file maybe 5-6 times a year. And just imagine being tested on an interview by some moron who just looked it up himself that very morning. ("Greg, how do you implement reading the binary file vs. ASCII file in Java?") So, Mr. Bright, how often do YOU write that code (without docs and Google)?

Hmmm... Maybe I should just write my own utility that I can at least remember the syntax for.

I'm thinking something like:

BufferedFileWriter fw = new BufferedFileWriter("foo.out");
fw.write(stringBuffer.toString());

For PrintWriters:

PrintingBufferedFileWriter pfw = new PrintingBufferedFileWriter("foo.out");
pfw.print(stringBuffer.toString());

To be fair, I guess I have the advantage - I can go back and refactor my stuff, and I do not need to be v1.0 backward compatible...

Greg

-----Original Message-----
From: Sashi Guduri [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, August 21, 2002 6:14 AM
To: JDJList
Subject: [jdjlist] RE: Java IO Question

"In general, a Writer sends its output immediately to the underlying
character or byte stream. Unless prompt output is required, it is advisable
to wrap a BufferedWriter around any Writer whose write() operations may be
costly, such as FileWriters and OutputStreamWriters. For example,

PrintWriter out
= new PrintWriter(new BufferedWriter(new FileWriter("foo.out")));
will buffer the PrintWriter's output to the file. Without buffering, each
invocation of a print() method would cause characters to be converted into
bytes that would then be written immediately to the file, which can be very
inefficient."

That was a direct quote from the javadoc for BufferedWriter....what happened
to the old art of RTFM?

And also, you want to use StringReader not StringBufferInputStream... as it
is deprecated..Once again you would have found that out if have RTFM

Sashi

-----Original Message-----
From: Abhilash Nair [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, August 21, 2002 8:48 AM
To: JDJList
Subject: [jdjlist] RE: Java IO Question

Yes Scot. I meant quickest to execute...
I've used StringBufferInputStream to read the data
from a StringBuffer and a FileWriter to write it on to
a text file to be stored in the local drive. Will
substituting BufferedWriter in place of a FileWriter
help the performance? Thanks for your suggestion.

Regards,
Abhi

--- Scot Mcphee <[EMAIL PROTECTED]> wrote:
> When you say quickest, do you mean quickest to code
> or quickest to execute?
> If you want quickest to execute I would use a
> BufferedWriter. Actually I'd
> use a BufferedWriter anyway.
>
> regs
> scot.
>
> > -----Original Message-----
> > From: Abhilash Nair [mailto:[EMAIL PROTECTED]]
> > Sent: Wednesday, 21 August 2002 03:50
> > To: JDJList
> > Subject: [jdjlist] Java IO Question
> >
> >
> > Hi All:
> >
> > Could anyone please suggest the fastest and most
> > efficient way to transfer data from a StringBuffer
> to
> > a text file in the local drive?
> >
> > Thanks in Advance
> > Abhi
> >
> > =====
> > You can reach me on:
> > Weekdays: (617)509-5312
> > Weekends and evenings: (781)321-2065
> > Pager: (781)553-8323
> > Thanks and Regards,
> > Nair Abhilash R
> > (Abhi)
> >
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>
>
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=====
You can reach me on:
Weekdays: (617)509-5312
Weekends and evenings: (781)321-2065
Pager: (781)553-8323
Thanks and Regards,
Nair Abhilash R
(Abhi)

__________________________________________________
Do You Yahoo!?
HotJobs - Search Thousands of New Jobs
http://www.hotjobs.com

To change your membership options, refer to:
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To change your membership options, refer to:
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To change your membership options, refer to:
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[jdjlist] RE: Java IO Question

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