java-programmer >>You don't know anything ...

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- 1
  - 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;
    }
    }
- 1
  - stdout and stderr don't occur sequentially in Eclipse and NetbeansZelluX wrote:
    > But System.err is unbuffered, so I don't think it will have any effect
    > to flush after every write.
    
    There is nothing in the Javadocs to indicate that System.err is unbuffered.
    Like System.out, System.err is a java.io.PrintStream. The docs for
    PrintStream imply that instances are buffered, else the flush() method would
    be meaningless. So it is not accurate, or at least not safe to say that
    System.err is unbuffered.
    
    That leaves auto-flushing. Nothing in the Javadocs for System.err indicates
    that it's created with autoFlush on. Did you check the source for your
    particular flavor of Java to see if it is?
    
    In my installation, the source shows:
    setErr0(new PrintStream(new BufferedOutputStream(fdErr, 128), true));
    
    Whaddaya know? System.err is buffered in my installation.
    
    Sun Java JDK 1.6.0_10b25, 64 bit, Linux.
    
    Are you quite certain that System.err is unbuffered in your Java installation?
    
    --
    Lew
- 1
  - Great time in FranceHello
    
    I had a fantastic time in France, hope to visit again soon.
    
    I found a holiday cottage from these guys www.looktogo.co.uk
    
    Regards,
    
    Dancer: ).
- 1
  - 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?
- 3
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- 6
  - Multiple thread handle problemhi
    
    I am starting a no.of threads(500) from my application. i want to
    start a new thread as soon as one of these threads dies.Any of the
    thread could die at any particular time.Currently i am using a loop
    to check which of the threads is alive and i can use join() for
    others.I don't want to use a loop as that is eating a lot of memory.
    
    Using synchronization method is it possible to block (creation of new
    thread) untill one of the current thread dies.
    
    Please help...
    
    Anks
- 7
  - 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
- 7
  - J2EE architecture questionHello.
    Iv read a spec from a firm which wants to build a J2EE application,
    but the application is not supposed to be web based. The reason for
    this is mostly a very complex UI.
    From what ive read about the J2EE architecture ,the presentation layer
    has always been servlets or jsp.
    
    Is it a posibility / option to build a J2EE application without the
    web based presentation layer?
- 7
  - fixing image sizeI realise there have been several posting on this subject already.
    However, despite these, I still can't quite work out how to do this.
    
    I need to take the image from a file (.gif .jpg etc), ensure that the
    entire image fits on a JPanel of some size, then put this JPanel onto
    another Jpanel.
    
    From what I could gather, it looked like I had to extend JPanel and
    override paint(). The problem comes when I try to use drawImage().
    Here's the code.
    
    //relevent imports
    
    public class Picture extends JPanel
    {
    private String fileName;
    
    /** Creates a new instance of Picture */
    
    public Picture(String file)
    {
    fileName=file;
    }
    
    public void paint(Graphics g)
    {
    super.paintComponent(g);
    
    }
    }
- 11
  - 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?
- 11
  - Special characters: how to read them into JTable?Hello everybody,
    
    I would like to read String data from a file into a JTable (using Vectors).
    These data contain special characters,
    mainly Greek symbols. Ideally, I would also like to display subscripts as
    well, if possible.
    
    Does anybody knows how this can be done?
    
    Thanks in advance,
    
    Maria
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- 12
  - 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
- 14
  - How to call run() of Canvas from MIDlet ?Hi All,
    I want to restart the run() of Canvas from the call of MIDlet,
    how to do it ?
    
    Thank you very much.
    
    Best regards
    Boki.
- 15
  - 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

Jeff Relf

Posted: 2003-12-18 23:02:00

Top

java-programmer, 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 .

Index ‹ java-programmer

Next
- 1
  - HELP got 'the code of method is exceeding 65535 limit in jaxbi have 50 elements like this:
    
    <xsd:element name="Refer" substitutionGroup="ResultBaseSub" >
    <xsd:complexType >
    <xsd:complexContent>
    <xsd:extension base="ResultBase">
    <xsd:attribute name="Text" type="DbRef" />
    </xsd:extension>
    </xsd:complexContent>
    </xsd:complexType>
    </xsd:element>
    
    i can divide them to smaller substituion groups, but will it help?
- 2
  - 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.
- 3
  - 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
- 4
  - 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 :)
- 5
  - 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
- 6
  - best struts-jsp-servlet development tool?Hello,
    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
- 7
  - 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
- 8
  - 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.
- 9
  - 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.
- 10
  - help with java assignmentWas just hoping someone could shed a bit of light on how to approach
    this assignment. It would seem we have to determine the value of a in
    order to determine how many times the method m() is called, but there
    doesn't seem to be enough information to determine a's value. Any tips
    would be greatly appreciated...
    
    Many Thanks
    
    For each of the following snippets of code, give the number of times
    method m() is called, with a brief explanation. Assume that a and b are
    nonnegative integers.
    Snippet A
    
    for (int i = a; i < a*a; ++i) {
    m();
    }
    int i = 0; int j = a;
    while (i <= j) {
    ++i;
    m();
    --j;
    }
    
    Snippet B
    
    For this one, first we define a method m1:
    
    public static void m1(int a) {
    for (int i = 0; i <= a*a; ++i) {
    m();
    }
    }
    
    Now the snippet:
    
    m1(a*a);
    
    Snippet C
    
    for (int i = a; i != a + b; i += 2) {
    for (int j = a/2; j > 0; --j) {
    for (int k = 1; k < a; ++k) {
    m();
    }
    }
    }
    
    Snippet D
    
    for (int i = 0; i < a; ++i) {
    for (int j = 148; j < i; ++j) {
    m();
    }
    }
- 11
  - 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
- 12
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    people, who are searching at google for following
    keywords. They are ready to buy clients and they are searching these =
    products to make a purchase. If they reach at your
    site at this time, chances are very great that your site can make a sale =
    to them.=20
    
    keywords:=20
    
    exporter of india
    indian exporter
    exporter from india
    india's exporter
    exporter of abc (abc is your product name)
    abc exporter
    abc manufacturer
    indian abc exporter
    
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    http://lists.freebsd.org/mailman/listinfo/freebsd-java
    To unsubscribe, send any mail to "email***@***.com"
- 13
  - 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
- 14
  - 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
    to get java working?
    
    Anon.
- 15
  - Release build in EclipseDoes anyone know how to make a lean release build with Eclipse,
    binaries without debugging info ?