java-programmer >>BufferedInputStream vs BufferedReader

BufferedInputStream vs BufferedReader

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- 1
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    } catch(JAXBException jex) {
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    return obj.getValue();
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    I hope someone has something wise to say about this. I've really
    twisted my brain to try to figure it out!
    
    Thanks.
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    Please help
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Author

Message

Roedy Green

Posted: 2007-8-5 21:38:00

Top

java-programmer, BufferedInputStream vs BufferedReader Has anyone done any experiments on which is preferable -- putting your
buffering at the BufferedInputStream level or the BufferedReader level
when you have a Reader?
--
Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

a24900@googlemail.com

Posted: 2007-8-6 2:03:00

Top

java-programmer >> BufferedInputStream vs BufferedReader On Aug 5, 3:37 pm, Roedy Green <email***@***.com>
wrote:
> Has anyone done any experiments on which is preferable -- putting your
> buffering at the BufferedInputStream level or the BufferedReader level
> when you have a Reader?

Buffer as low / as early in the chain as possible. That way there is
more code on top of the buffer that might profit from it. Might, but
need not. That depends on what code you have on top of the buffer.

For example, an InputStreamReader decoding some multi-byte char
encoding (UTF ...) needs of course to read more than one byte to
decode one char. How it does that is implementation dependent. It
could do that with a sequence of one-byte reads. In that case a buffer
below could speed up things. Another InputStreamReader could buffer on
its own. In this case a buffer below would not help (but not hurt
much), but a buffer above maybe also not help.

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    right track?
    
    1. Objects are glorified functions:
    Ojects are just like functions, as in, you have a code-block you think
    might have to be repeated over and over again in your program. Might
    as well write it once and keeping using it. Objects are these
    code-blocks.
    
    2. Objects are user-defined data-types:
    Objects are just like int, float, double etc., but you get to define
    them!
    User defines what sort of data and its attributes an object has holds.
    
    I know they are defined in a gazillion different ways but, is this a
    good way to start? Did I miss any other fundamental concepts of
    Objects?
    
    Another thumb-rule I'm thinking of implementing till I get a hang of
    the Objects: Always try to objectify every darn piece of executable
    statement as a first resort.
    
    Your comments, please.
    Also, any books/URLs you'd recommend for the absolute beginner in
    Objects( with reference to Java, especially).
    
    Thanks for your time,
    Reddy
- 9
  - list of arraysI have created a List with the intention of putting elements of
    one-dimensional arrays within it. The arrays contain integers. The lines
    I've used are:-
    
    (for the purposes of this, I have set variableNumber equal to 5)
    
    List<int[]>combinationList = new ArrayList<int[]>();
    int[] degrees = new int[variableNumber + 1];
    
    { some routine which fills each element of 'degrees' with a random integer}
    
    then, I wish to add the newly filled 'degrees' to the end of the list, using
    :-
    combinationList.add(degrees);
    
    theres no problem just doing this the once, but if I attempt to add another
    instance of 'degrees' to the list using the same above statement, then it
    seems to overwrite the initial instance of degrees with the new one.
    
    Why is it doing this? I cant seem to find a way around it. If I run
    through say 10 iterations of the above then I am simply left with a list of
    10 arrays all of which are identical to the last generated instance of
    'degrees'.
    
    Thanks
- 10
  - Java 1.4 on a FreeBSD 7Hi,
    
    Did anyone manage to install Java 2 JDK 1.4.2 in a FreeBSD 7?
    
    I really need a payment service form SecureTrading, and it doesn't work on
    version 1.5.
    
    Any ideas?
    
    Cheers,
    
    Gabriel Engel
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    http://lists.freebsd.org/mailman/listinfo/freebsd-java
    To unsubscribe, send any mail to "email***@***.com"
- 11
  - signum of longRoedy Green wrote:
    
    > On Fri, 03 Feb 2006 04:10:08 +0100, Piotr Kobzda <email***@***.com>
    > wrote, quoted or indirectly quoted someone who said :
    >
    >>Hmm, 9th candidate is here:
    >>
    >>return (int)( diff >>> 32 ) | ( (int)diff | (int)diff << 1 ) >>> 1;
    >
    
    You have missed my advice. This one is my next candidate. :))
    Following the code carefully, you should see the difference...
    
    Your benchmark (version 1.1) has *eight* candidates (not nine).
    I've added my new candidate (9th in the collection) under the name
    "piotr" into your benchmark, the results are in my previous post.
    
    Regards,
    piotr
- 12
  - import="ShoppingBasket,Product,java.util.*" Error in JSP pagevivienne wykes wrote:
    
    > Hi There,
    > I am trying do a shopping cart tutorial and have the following error when
    > compiling my shop products.jsp file.
    >
    >
    >
    > shop_0002dproducts$jsp.java [3:1] '.' expected
    > import ShoppingBasket;
    >
    >
    > <%@ page language="java" contentType="text/html"
    > import="ShoppingBasket,Product,java.util.*"
    > errorPage="errorpage.jsp" %>
    >
    >
    > I am not sure if it has to do with mutiple imports of the ShoppingBasket
    > and Product classes.....
    > Would it be better to put these two classes into a package ? The classes
    > compile ok but have a problem with the above import.
    > Thanks
    >
    > Jim Ascroft
    
    Stop asking the same question over and over again. You've gotten an answer
    already.
    
    --
    Kind regards,
    Christophe Vanfleteren
- 13
  - JPanel - setVisible(true)Hello,
    
    I'm creating a small test application with one main JFrame.
    This JFrame has a default JPanel as its content pane and it has a
    small menu that allows you to switch to change your content pane to
    another JPanel.
    
    The code to switch the contentpane in the JFrame:
    
    private void changeContentPane(JPanel panel) {
    setContentPane(panel);
    setVisible(true);
    }
    
    If i don't include the setVisible(true) statement in this method and I
    click the menu to change the content, the content pane is not visible
    until I resize the screen.
    
    What is the reason for this and what is the logic behind the
    setVisible(true) statement in this method. (I do understand why the
    "setVisible" is needed in the constructor of the JFrame: to show the
    frame on screen)
    
    Greetings,
    
    Jos Bosmans
- 14
  - JSP Import CSV into databaseI'm looking to implement a feature into a JSP web app which will allow users
    to import a CSV file into a database. My thoughts are that the process would
    involve the following steps:
    
    1) Transfer the CSV file from client to web server.
    
    2) Have a simple Java application check folder location intermittently for
    new files in upload folder on website
    
    3) If a new file has been uploaded then parse the CSV into a collection of
    JavaBeans
    
    4) Use JDBC to import each JavaBean into table
    
    My questions are the following:
    
    - Is this the best way to achieve this (bearing in mind each row will need
    to be validated)?
    
    - What is the most appropriate method of tranferring a file to a JSP web
    server?
    
    - How should I transfer the JavaBean data to the SQL database - import each
    bean one-by-one?
    
    Any advice would be appreciated.
- 15
  - JavaMail sending problem and solutionI had chronic problems with sending email via smtp. I could sign in
    via a mail client and send to a remote user just fine, but JavaMail
    refused to send to any but local users, citing a 550 relaying problem.
    All of the references I could find on the web told me to talk to my
    mail admin, but I'm he and I also knew that if my mail client could do
    it, so could I.
    
    This solution requires that you log into the mail server as a normal
    email user - you will have to create an (or use an existing) account.
    You turn on smtp authorization by setting the a property you pass in
    to get a session: the property is mail.smtp.auth and you set it to
    "true". Then you create an Authenticator that returns a
    PasswordAuthentication with your username and password in it.
    
    Here's an excerpt of working code:
    
    Authenticator authenticator = new Authenticator() {
    public PasswordAuthentication getPasswordAuthentication() {
    return new PasswordAuthentication(FROM, PASSWORD);
    }
    };
    
    Session mailSession = Session.getInstance(getMailProperties(),
    authenticator);
    
    Message email = new MimeMessage(mailSession);
    try {
    email.setFrom(new InternetAddress(FROM));
    email.setSentDate(new Date());
    
    email.setRecipients(Message.RecipientType.TO,
    stringsToInternetAddresses(to));
    email.setRecipients(Message.RecipientType.CC,
    stringsToInternetAddresses(cc));
    email.setRecipients(Message.RecipientType.BCC,
    stringsToInternetAddresses(bcc));
    email.setSubject(subject);
    email.setText(body);
    
    Transport.send(email);
    retval = true;
    } catch (Exception e) {
    }
    
    My getMailProperties includes the following:
    mail.smtp.host=some.mail.host.com
    mail.smtp.auth=true
    
    I just post this here for posterity so maybe someone else doesn't go
    through the hell I did to figure this out :)