java-programmer >>Shootout (startup)

Shootout (startup)

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- 2
  - Java will not workI have recently bought a new computer with windows XP and
    internet explorer 6. Any page that i try to access that
    contains java will not load the java. I have recieved
    warnings like ". . .requires a java compatible browser to
    run". I have searched the security options and can find
    nothing that will help.
    
    Do i have to download anything or change any options
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- 3
  - how to fire JTree child node eventI have a JTree where each node displays a specific view when selected.
    I'd like to somehow fire an event to default the app which view to
    display when opened.
    
    How do I fire an event for a JTree as if the user clicked on a specific
    child node?
- 8
  - How to approachLuc The Perverse wrote:
    ...
    >
    > WAIT!
    >
    > I think I got it (I'm not meaning to imply that you didn't help) - and I
    > didn't look at anything.
    >
    > Let's say there are NxN squares, and there are x number of moves.
    >
    > I can make the square x, y be represented as an integer 0..N * N - 1
    >
    > So I create a 2D array [N*N][x] of longs which will represent the sum of the
    > number of unique paths to the given point.
    ...
    
    You got it. There is an optimization that reduces the memory cost,
    but you have a dynamic programming solution to the problem. And you have
    the really big savings from exponential to linear increase in time and
    memory as the number of moves increases.
    
    > Hey thanks everyone. This is more than just a single problem or some points
    > on a practice problem that doesn't matter anyway. I'm learning how to do
    > this, and becoming a better programmer - and that is important to me.
    > Learning new abstract concepts, and having exciting revelations is actually
    > (though sadly) a bit of a rarity for me.
    
    I think, more than ever after seeing this, that you would benefit from
    reading a book on algorithm design.
    
    Patricia
- 9
  - Where Does the Code Go?I have a good programming practice question. Just for fun, Ive taken on a
    side project that will help a teacher friend of mine work out grades. I
    want a GUI interface that will store and retrieve grading info. So Im
    hoping someonecan walk me through my class structure. My biggest question
    regards whether or not it is good programming practice to have data objects
    as members of my GUI class or if it should be done another way? I have my
    main class which calls the GUI class. For now in my most basic skeleton, I
    have a very simple student class, contains has a grade class. How should
    these classes be arranged?
    
    My first thought was have student a member of the GUI class. Say I have a
    form with nothing more then two text fields for name and grade, and a
    button. When I click the button, I want to store the the textfield data in
    the student/grade classes. I can do that fine if student is a member of the
    GUI class, but for some reason Im uncomfortable with this design. It seems
    the GUI should be design only, no data access code in there. Eventually I
    want to add database connection objects to this model for permanent student
    data storage and would need to know where those would be called from as
    well. So what do you guys think?
    
    Classes:
    Main
    Gui
    Student -> Grade
    How to arrange?
    
    Thanks
    Rv5
- 9
  - How to prevent the filechooser resolving symblic linksHello everybody
    
    I am using a filechooser object to select files.
    
    JFileChooser _fileChooser = new JFileChooser();
    File[] selectedfiles = _fileChooser.getSelectedFiles();
    
    for (int i =0 ; i < selectedfiles.length; i++) {
    //path = selectedfiles[i].getCanonicalPath();
    path = selectedfiles[i].getPath();
    }
    
    The _fileChooser.getSelectedFiles() returns already absolute path
    names. So no matter if I call getPath or getCanocialPath I get the
    abosolute path names.
    
    But I want to display symbolic links as relative pathnames.
    
    Is there a way to accomplish this?
    
    Any help I will welcome.
    
    Thanks in advance,
    Zoran
- 12
  - You don't know anything ...Hello John Bailo , You wrote ,
    " I know when someone is bilking his customers
    for c++ code whose functionality should be written in
    OpenCalc macros "
    
    You comment re-proves :
    1 _ You don't know anything about
    programming for the desktop .
    2_ You don't know anything about my customers ,
    even thought I've explained them to you
    a million times .
- 12
  - Problem with focus on JListHi!
    I got 2 JLists . I doubleclick an item to display it's details.
    This works fine so far, but:
    When I select an item in JList1 and in JList2 the Mouselistener doesn't
    know from which JList he should get the item.
    So I had the idea that when you select an item in JList1 JList2 should
    loose all selections.
    But I just don't get it done.
    any ideas?
- 12
  - remote databaseHello!
    
    I'm quite new to Java. I'm making an MySQL interface. So my problem is:
    
    Can I connect to a remote mysql database without having any additional
    software running on that server ?
    Is JDBC part of JVM ?
    
    I know these are silly questions, but you would help me a great deal.
    
    Thank you!
    
    Darko
- 12
  - String and Char HelpI have a few questions but first here is my code.
    
    public class CountVowels
    {
    public static void main(String[] args)
    {
    int vowel = 0;
    int i;
    char pos;
    String String1 = "Event Handlers is dedicated to making your
    event a most memorable one.";
    int length = String1.length();
    for(i = 0; i < length - 1 ; i++);
    {
    pos = String1.charAt(i);
    if (pos == 'A' || pos == 'a' || pos == 'E' || pos == 'e' ||
    pos == 'I' || pos == 'i' || pos == 'O' || pos == 'o' || pos == 'U' ||
    pos == 'u') {
    vowel += 1;
    }
    }
    System.out.println("There are " + vowel + " vowels in this
    String");
    }
    }
    
    Question one is why does String1.length() return 70 when there are
    only 69 chars. Second question is why does this code not count the
    vowels in the String.
    
    Thanks in advance
    
    Robert
- 12
  - Release build in EclipseDoes anyone know how to make a lean release build with Eclipse,
    binaries without debugging info ?
- 15
  - help adding items to JComboBox on the flyAnyone happen to see what I might be doing wrong. I'm trying to add
    items to my
    
    JComboBox on the fly as nodes are added to the tree. It's like this ...
    
    1. User adds tree nodes to a tree.
    2. Then user can select on another node elsewhere in the tree which
    renders a JComboBox
    
    and the items just added from step 1 are listed in this box.
    
    I have a few problems ...
    - after I select my item in the combobox, the combobox stays there. If
    I then select on another node, the item in the combobox doesn't get
    selected. It doesn't work where I just select an item and it closes up
    and that item is selected.
    
    - sometimes I get a null pointer exception in action performed (because
    getSelectedIndex() in getCellEditorValue() returns a -1) which seems to
    get called while the program execution is still in the
    getTreeCellEditorComponent. This confuses me. Why's it returning -1
    when there are items in my combobox?
    
    Any help much appreciated.
    
    (I hope I've got my code snippet here w/o any typos, I had to cut it
    down)
    ----
    
    public class TreeEditor extends AbstractCellEditor implements
    TreeCellEditor
    {
    private JComboBox myComboBox;
    
    public TreeEditor() {
    myComboBox = new JComboBox();
    
    myComboBox.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent ae) {
    TreePath path = jTree.getSelectionPath();
    
    stopCellEditing();
    
    Integer val = (Integer) getCellEditorValue();
    
    myComboBox.setSelectedItem(val.intValue());
    
    ((MyUserObjectInfo)nodeInfo).setName(
    myComboBox.getSelectedItem().toString());
    
    node.setUserObject(((MyUserObjectInfo) nodeInfo));
    jTree.getModel().valueForPathChanged(path, nodeInfo);
    }
    });
    }
    
    public Object getCellEditorValue() {
    
    return new Integer(myComboBox.getSelectedIndex());
    }
    
    public Component getTreeCellEditorComponent(JTree tree,
    Object value, boolean isSelected, boolean expanded,
    boolean leaf, int row) {
    
    // find the children of this node that were recently added ...
    TreeModel tModel = jTree.getModel();
    Object root = tModel.getRoot();
    DefaultMutableTreeNode carRoot = (DefaultMutableTreeNode)
    tModel.getChild(root, 0);
    
    String nodeName = null;
    
    if (myComboBox.getItemCount() > 0) {
    myComboBox.removeAllItems();
    }
    
    // add children of another node into this combobox.
    for (Enumeration e = carRoot.children(); e.hasMoreElements();)
    {
    DefaultMutableTreeNode carNode =
    
    (DefaultMutableTreeNode)e.nextElement();
    Object nodeInfo = carNode.getUserObject();
    nodeName = ((MyUserObjectInfo)nodeInfo).getName();
    
    myComboBox.addItem(nodeName);
    }
    
    if (myComboBox.getItemCount() > 0) {
    myComboBox.setSelectedIndex(0);
    }
    
    return myComboBox;
    }
    }
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    We are going to develop a web based application that uses Oracle 9i
    database at the beckend. We started with Oracle JDeveloper 10g. It
    seems fine but it fails to meet our needs at some points. Can you
    recommend another tool for us?
    Thanks in advance
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  - Class.forname()Hello ,
    I have a necessity to delete a jar file which is in the CLASSPATH.
    But JVM locks it after a class.forName() call, even though the class
    loaded is NOT in the JAR file I want to delete. ( I cannot remove the
    JAR file from the CLASSPATH )
    
    First of all is it possible?
    
    Any help is appreciated
    
    thanks in advance
- 15
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    keywords:=20
    
    exporter of india
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- 16
  - Calling own-constructors inside another constructorHi all,
    
    Inspecting some pieces of code from someone I found things like this:
    
    class A {
    private String id = "";
    
    public A() {
    super();
    }
    
    public A(String id) {
    this.id = id;
    }
    }
    
    class B extends A {
    public B() {
    this(""); <-------------------- HERE!
    }
    
    public B(String id) {
    super(id);
    }
    }
    
    Inside constructor B() it's calling a constructor. Could this cause some collateral or strange problems?
    I know it's nonsense because id attribute it's being initialized by default to "", but I'd like to know if
    also is a problem.

Author

Message

Razii

Posted: 2008-5-6 15:18:00

Top

java-programmer, Shootout (startup)
>On Wed, 30 Apr 2008 08:00:38 -0700 (PDT), Isaac Gouy
<email***@***.com> wrote:

>Why don't you go through all...

startup benchmark...

http://shootout.alioth.debian.org/gp4/benchmark.php?test=hello&lang=all

Damn! C & C++ are killing java in this benchmark. Though I discovered
a trick that improves the speed somewhat and saves some face...

With n = 200 (i.e 200 startups in continuous order).

java hello

time: 23.433s

However, just adding the flag -XX:+AggressiveHeap

java -XX:+AggressiveHeap hello

time: 9.914s

that's a huge improvement.

Razii

Posted: 2008-5-6 16:56:00

Top

java-programmer >> Shootout (startup) On Tue, 06 May 2008 02:17:45 -0500, Razii <email***@***.com> wrote:

>java -XX:+AggressiveHeap hello

I got refusal email from Isaac Gouy to use this flag in this case. But
he has no problem with adding sse2 flag whenever that helps C++
version. I wonder why the double standard?

Razii

Posted: 2008-5-7 21:50:00

Top

java-programmer >> Shootout (startup) On Tue, 06 May 2008 03:56:28 -0500, Razii <email***@***.com> wrote:

>I got refusal email from Isaac Gouy to use this flag in this case. But
>he has no problem with adding sse2

Also, with gcc version, the comments says....

* Tell GCC that we don't want atexit, we don't want to use the heap,
* and we really don't want anything. Can't even call write the
"normal"
* way, because write() isn't linked in....
*
* Compile flags are picky for this. I used:
* gcc -pipe -Wall -O3 -fomit-frame-pointer -march=pentium4
-ffreestanding -nostartfiles -s -static -o start3 start3.c
*/

the gcc version doesn't even compile with cygwin. However, Gouy
refused to use -XX:+AggressiveHeap flag when it's clearly much faster
for this benchmark.

Index ‹ java-programmer

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- 1
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    /******************************************************************/
    Paul J. Perrone
    Assured Technologies, Inc.
    Web: www.assuredtech.com
    Author of various books on J2EE, Java, XML, and Web
    Services: http://www.assuredtech.com/books_page.htm
    Recently completed project includes the
    "J2EE Developer's Handbook" geared for J2EE v1.4.
    /******************************************************************/
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- 5
  - From JAVA to EXE without the JRE
    "Emil" <email***@***.com> wrote in message
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    (www.zerog.com).
- 6
  - Where is the Information Systems industry headed?Our university is doing some survey work to consider where the world
    of IS is headed. Since most of those here work in that world, I'm
    interested in your thoughts, especially if you think you have a good
    feel for job skills needed now and job skills needed in the future.
    
    The question is sort of two pronged.
    
    First, where are IS jobs headed? Will there continue to be a
    significant demand for programming skills? What type of analysis
    skills (especially in terms of those that can be developed
    academically) are important? Are the requirements changing -- will
    things look different in the next five to ten years?
    
    Second, what are the specific things you would think IS majors should
    understand when leaving the university? Do you think any of those
    things are going to change in the next 5-10 years?
    
    Those are broad questions since I want to leave a lot of room for your
    thoughts. I'd like to have some idea of what your role is in your
    business and what type of business you are in if you answer (I know
    some people don't like to give specifics on here and that's fine --
    just "we are a manufacturing company, or I'm a private consultant" is
    enough).
    
    Lastly, I'd point out that I'm not interested in specific language
    skills, etc. I'm not interested in starting another Sun/Microsoft war
    or anything like that. Our philosophy is that even if we use Java/Sun
    products for everything we do, you ought to be able to go into a shop
    using Smalltalk or .Net or whatever and get up to speed quickly -- so
    it's the broader concepts that I'm referring to.
    
    I don't know whether I'll reply to all responses unless I'm looking
    for clarification, but I promise I'll give all serious consideration.
    
    Thanks for any ideas,
    
    Marty McMahone
    University of Mary Hardin-Baylor
    Texas
- 7
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- 8
  - The Smallcap Journal vINSIDE INFO ALERT
    This advisory is based on exclusive insiders/agents information. (NHVP.PK)
    NHVP has provided investors with 1000% + gains during the real estate boom, and now with the sector at its bottom, is ready to provide with results yet again..
    
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    The NTSB's update outlined factual information about the crash, but did not conclude what the probable cause of the crash was. The full board will likely vote on a ruling at a later date.
    Funeral services were also scheduled over the next several days for firefighters Jess McLean, 27, of Beaumont; Daniel Hoover-Najera, 20, of San Jacinto; Mark Loutzenhiser, 43, of Idyllwild; and Pablo Cerda, 23, of Fountain Valley. A public memorial service for all five men was planned for Sunday.
    Oyler was charged with five counts of murder, 11 counts of arson and 10 counts of use of an incendiary device. The charges include seven fires in June, one in July, one in September and two in October.
    The National Transportation Safety Board said the wind, coupled with the pilot's inability to turn sharply, forced the aircraft away from its intended path over the East River and into the building.
- 9
  - RMI between Java 1.4 and Java 1.5 problemWhen attempting to RMI between a 1.4 client and a 1.5 server ( with a
    1.5 interface, remote object, stubs and skeletons using the -vcompat
    rmic flag ), I get the following error:
    
    java.lang.ClassNotFoundException:
    java.rmi.server.RemoteObjectInvocation
    Handler (no security manager: RMI class loader disabled)
    
    The plot thickens. The 1.4 client will connect to the 1.5 server if I
    run the 1.4 client classes in a 1.5 jvm. However, when I run the 1.4
    compiled classes in a 1.4 jvm I get no joy.
    
    Any ideas anyone?
    
    The context is this: getting a Java strored procedure in an Oracle
    database running a 1.4 jvm to send "trigger" information to a java
    1.5 server on a different machine.
    
    BTW, the rmi interface is very simple. One method, no return type and
    the only passed parameter is a string.
- 10
  - Automatically install java plug-inHello,
    How can I automatically install (Internet explorer install dialogbox) the
    java plugin from my HTML page.
    
    Need sample code, please.
    
    Thanks :)
- 11
  - Eclipse - problem with external tool path name.I am running Eclipse 3.2 with on Windows with WebSphere WSAdmin set up
    as an external tool. WSAdmin is basically a bat file that executes a
    Java program. It takes a number of parameters one of which can be a
    file containing properties.
    
    External tool: C:\IBM\WAS51\DeploymentManager\bin\wsadmin.bat
    
    Working directory ${workspace_loc:/WSAdmin}
    
    Arguments:
    
    -lang jacl
    -host localhost -port 8879
    -f ${resource_loc} ${resource_loc:/WSAdmin/WAS5.1/propertyFiles/Aquila/
    aquila.properties}
    
    The property file name "${resource_loc:/WSAdmin/WAS5.1/propertyFiles/
    Aquila/aquila.properties}" gets converted to
    "C:homepatrickeclipseWSAdminCVSWSAdminWAS5.1propertyFilesAquilaquila.properties
    "
    
    Obviously the back slashes are being escaped. Is there any way I can
    prevent this?
    
    I have already tried "${resource_loc:\\WSAdmin\\WAS5.1\\propertyFiles\
    \Aquila\\aquila.properties}" without success.
    
    ERROR: file
    C:homepatrickeclipseWSAdminCVSWSAdminWAS5.1propertyFilesAquilaquila.properties
    does not exist.
- 12
  - javap: fully qualified names for "new" statementsHello,
    
    I'm using javap for my project.
    Basically, what I'm interested in are the "new", "newarray" and
    "anewarray" statements.
    However, javap only outputs things like:
    new #10; //class StringBuffer
    
    but does not give me the fully qualified name.
    
    Is there any way I could get to know this information?
    
    Cheers,
    
    Sebastien Marion
- 13
  - java assembler pjb[[[ Google probably will join this post to the 2003-01-03 thread of
    the same name, your newsreader may be less helpful. ]]]
    
    Kindly offline I was asked to confirm ...
    
    Yes, instructions appear at:
    http://groups.google.com/groups?threadm=2695edf1.0301031438.6fb5cd8%40posting.google.com
    
    Yes I can fetch 48,910 bytes from:
    http://members.aol.com/plforth/pjb.zip
    
    Yes that .zip contains the compressed folder pjb/.
    
    pjb/README.txt tells us nothing new except that I am
    mailto:email***@***.com and we can click thru to pjb/cshlog.txt. In
    turn, pjb/cshlog.txt suggests ..
    
    Three steps:
    
    --- 1) a procedure to produce the disassembly
    HelloWorldAppJavaAssembler.java:
    
    cd pjb
    javac HelloWorldApp.java pjb/JavaAssembler.java
    cp -ip HelloWorldApp.class HelloWorldApp.bin
    java pjb.JavaAssembler HelloWorldApp
    
    --- 2) A procedure to reassemble the disassembly:
    
    javac HelloWorldAppJavaAssembler.java
    rm HelloWorldApp.class
    java HelloWorldAppJavaAssembler
    
    --- 3) A comparison to show we have reassembled precisely the same
    .class file:
    
    diff HelloWorldApp.bin HelloWorldApp.class
    
    Pat LaVarre
    
    P.S. I ran this example in Mac OS X, with ships with javac installed,
    even if you do not install the Developer's Disk. Linux with Java
    should work identically. Windows with Java syntax for these is as
    shown except `copy /-y` and `del` and `fc /b` for what here appears as
    `cp -ip` and `rm` and `diff`.
- 14
  - what's wrong? my first simplest java program failed..I created a test.java file in D:\j2sdk1.4.2_04\bin>
    and the content:
    class
    {
    public static void main(String[] args)
    {
    System.out.println("Hello World!");
    }
    }
    
    then I compile it:
    
    D:\j2sdk1.4.2_04\bin>javac test.java
    test.java:1: <identifier> expected
    class
    ^
    test.java:8: '{' expected
    ^
    2 errors
    
    D:\j2sdk1.4.2_04\bin>
    
    my book tell me it would work well, what's wrong?
    --
    Your fault as a Government is My failure as a Citizen.
- 15
  - SocketServer accept() fails to work (Linux)Hello,
    
    I have the following problem with my server appllication:
    
    This is typical server implemented in Java, using ServerSocket object,
    waiting for client to connenct on ServerSocket.accept()
    method. When the client connects (socket is received from accept() method)
    it is handled by the server in separate thread.
    The server writes the received data to the file and then closes the socket.
    The problem:
    the server handles about 20 connections daily, receiving about 100kB - 1MB
    of data in each connection.
    However after a few days the server fails to work,
    the server waits on ServerSocket.accept() (as usually), however the clients
    fail to connect to the server, but the server does not see
    that any client tried to connect to it, it just waits on
    ServerSocket.accept().
    
    I'm using jre1.4.2_04 on Linux - Red Hat 9
    
    Is there some bug in java-Linux-socket implementation or in my code ?
    Thanks in advance.
    
    This is the result of system netstat (after a few clients failed to connect
    to the server):
    
    tcp 78 0 localhost:32323 localhost:2560 CLOSE_WAIT
    tcp 78 0 localhost:32323 localhost:2568 CLOSE_WAIT
    tcp 78 0 localhost:32323 localhost:2576 CLOSE_WAIT
    tcp 78 0 localhost:32323 localhost:2584 CLOSE_WAIT
    tcp 78 0 localhost:32323 localhost:2340 CLOSE_WAIT
    tcp 78 0 localhost:32323 localhost:2592 CLOSE_WAIT
    tcp 78 0 localhost:32323 localhost:2348 CLOSE_WAIT
    tcp 78 0 localhost:32323 localhost:2344 CLOSE_WAIT
    tcp 78 0 localhost:32323 localhost:2356 CLOSE_WAIT
    tcp 78 0 localhost:32323 localhost:2352 CLOSE_WAIT
    tcp 78 0 localhost:32323 localhost:2608 CLOSE_WAIT
    
    A snippet of the server source:
    
    private class Server
    {
    private ServerSocket _serverSckt = null;
    private boolean _break = false;
    
    ServerRunnable()
    {
    _serverSckt= new ServerSocket(32323);
    _serverSckt.setSoTimeout(2000);
    }
    
    public void exeServer()
    {
    try {
    Socket clientSckt = null;
    while (!_break)
    {
    try {
    clientSckt = _serverSckt.accept();
    
    } catch (SocketTimeoutException ex) {
    // ok, timeout occured, while loops again
    } catch (InterruptedIOException ex) {
    final String sMsg = "_serverSckt Interrupred!!!
    managed to transfer " + ex.bytesTransferred + " [bytes]";
    _LOGGER.error(sMsg, ex);
    }
    
    if (clientSckt != null) {
    
    getClientHandler().handleClient(clientSckt); //
    handles client in separate thread
    // note: clientSckt is closed by client handler
    
    clientSckt = null;
    }
    }
    } catch (IOException e) {
    _LOGGER.error(e);
    } catch (Throwable thr) {
    _LOGGER.fatal(thr);
    } finally {
    _serverRunning = false;
    try {
    _serverSckt.close();
    } catch (IOException e) {
    Assert.catchReport(e);
    }
    }
    }
    }