java-programmer >>DefaultTreeCellRenderer

DefaultTreeCellRenderer

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- 2
  - Java Interview Questions: Am I Being Too Difficult?I've been tasked with doing technical interviews at my company,
    and I have generally ask a range of OO, Java, and "good programming
    technique" concepts.
    
    However, one of my favorite exercises I give interviewees seems
    to trip them up all the time, and I wonder if I'm being too much
    of a hardass... it seems easy enough to ME, but these guys, when
    I get them up to the whiteboard, seem to get really confused.
    
    The exercise is this:
    
    Create one or more classes that represent a binary tree.
    
    This class(es) must be able to do standard sorts of operations
    one would do on a binary tree in a good, OO sort of way.
    
    A node in this tree holds only a single, String, value.
    
    Now write for me a method named 'find' that takes an argument
    of a String (or a String and a Node, depending upon your
    implementation) and returns a java.util.List of all nodes,
    from the node it's called upon and all descendent nodes, inclusive,
    who's value matches that of the String argument.
    
    The code must be syntactically correct, and would compile.
    
    As an added exercise, how would you make this code thread-safe?
    
    Seems pretty simple, huh? But most guys we've brought in just sit there
    staring at the board, and have trouble even writing the basic
    Node class... they get all confused, don't know how to traverse a
    tree, etc.
    
    Am I unreasonable in expecting someone to be able to do this???
    
    - Tim
    
    --
- 2
  - [Switch()...case]From String to enumDaniel Moyne wrote:
    > To extend this topic a little bit : in Java is there any simple built-in
    > method to get the whole collection of instances already created of a
    > class ; here the whole collection of instances can easily be accessed with
    > values() ; then iteration is made possible to search for a particular
    > instance fulfilling some conditions (here the unique member = a particular
    > value) ?
    
    Only for enums.
    
    You can, of course, create your own Collection (Set, List, Map) of instances
    of any non-enum class. There is a more-or-less standard idiom for that,
    called a "registry".
    
    public class RegisteredInstance
    {
    private static final Map <String, RegisteredInstance> registry =
    new ConcurrentHashMap <String, RegisteredInstance> ();
    
    private final String name;
    
    public RegisteredInstance( String n )
    {
    if ( n == null )
    {
    throw new IllegalArgumentException( new NullPointerException(
    "name is null" ));
    }
    name = n;
    registry.put( name, this );
    }
    
    // add @Overrides for equals(), hashCode()
    // add other logic, including registry access
    }
    
    If you don't need associative lookup of the instances, you could use a Set or
    a List for the registry instead, and iterate at need.
    
    --
    Lew
    That is not the right way to use a semicolon in English.
- 4
  - GridBagLayout confusionGreetings,
    
    Resizing components added in a GridBagLayout doesn't seem to affect
    the actual size of the component. Where am I lost?
    
    Snippet below;
    
    import java.awt.*;
    import javax.swing.*;
    import java.awt.event.*;
    
    public class Demo
    {
    public static void main(String[] args)
    {
    Window win = new Window();
    }
    }
    
    class Window extends JFrame implements ActionListener
    {
    JButton bt1 = new JButton("Start Test 1");
    JButton bt2 = new JButton("Start Test 2");
    
    public Window()
    {
    super("Window Title");
    setSize(400,100);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setVisible(true);
    Container ca = getContentPane();
    ca.setBackground(Color.white);
    GridBagLayout gbl = new GridBagLayout();
    GridBagConstraints gbc = new GridBagConstraints();
    ca.setLayout(gbl);
    
    bt1.addActionListener(this);
    bt2.addActionListener(this);
    
    gbc.gridx = 1;
    gbc.gridy = 1;
    ca.add(bt1,gbc);
    
    gbc.gridx = 2;
    gbc.gridy = 1;
    gbc.gridheight = 400;
    gbc.gridwidth = 400;
    bt2.setSize(400,400);
    ca.add(bt2,gbc);
    
    setContentPane(ca);
    }
    
    public void actionPerformed(ActionEvent e)
    {
    if (e.getSource()==bt1)
    System.out.println("You Pressed button 1");
    else
    System.out.println("You Pressed button 2");
    }
    }
- 4
  - Drawing a rectangle around an imageHi All
    
    I've succeeded in printing a rescaled Image, however when I use
    drawRectangle() to print a rectangle around the image the bottom third
    of the image is blacked out. What is the correct way to do this?
    
    Thanks
    Elliot
- 6
  - boolean questionpcourterelle wrote:
    > <email***@***.com> wrote in message
    > news:email***@***.com...
    >
    >>A boolean variable can hold one of two values over it's lifetime (three
    >>really).
    >>
    >>1. Uninitialized
    >> boolean var;
    >>
    >
    >
    > Hmmm. I've tried this and it will not compile. The boolean variable 'var'
    > has to be initialized to either true of false to be compilable. In a sense
    > the declaration
    >
    > boolean var
    >
    > sets the variable to null but since it doesn't compile what good is it?
    >
    > pc
    >
    >
    well duh, null is for objects! Not primitives...
- 6
  - Message Board ApplicationAnyone know a decent WWW message board application that runs on JSP? A
    critical feature is the ability to edit posts.
    
    GP
- 7
  - Printing JFrame including JTable and JLabelHi All
    I have The JFrame with JTable, JLabels and JButtons .I want to
    print only the JLabel and JTable (Leaving buttons) with prefered
    size.so help me to solve my printing problem.
- 11
  - Maven: Parse error reading POM. Reason: parser must be on START_TAG or TEXTIt appears mavens site builder doesnt read my pom.xml - though all the
    other utilities (compiles, package, filter etc.) are fine. It *is*
    valid XML (pom.xml follows stacktrace)
    
    C:\myproject\build\registration>mvn site
    [INFO] Scanning for projects...
    [INFO]
    -------------------------------------------------------------------------
    ---
    [ERROR] FATAL ERROR
    [INFO]
    -------------------------------------------------------------------------
    ---
    [INFO] Error building POM (may not be this project's POM).
    
    Project ID: unknown
    POM Location: C:\myproject\build\registration\pom.xml
    
    Reason: Parse error reading POM. Reason: parser must be on START_TAG or
    TEXT to
    read text (position: START_TAG seen ...<resources>\r\n
    <filters><filter>... @
    31:22)
    
    [INFO]
    -------------------------------------------------------------------------
    ---
    [INFO] Trace
    org.apache.maven.reactor.MavenExecutionException: Parse error reading
    POM. Reaso
    n: parser must be on START_TAG or TEXT to read text (position:
    START_TAG seen ..
    .<resources>\r\n <filters><filter>... @31:22)
    at
    org.apache.maven.DefaultMaven.getProjects(DefaultMaven.java:365)
    at
    org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:278)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:115)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:249)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
    java:39)
    at
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
    sorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:585)
    at
    org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
    at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
    at
    org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
    
    at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
    Caused by: org.apache.maven.project.InvalidProjectModelException: Parse
    error re
    ading POM. Reason: parser must be on START_TAG or TEXT to read text
    (position: S
    TART_TAG seen ...<resources>\r\n <filters><filter>... @31:22)
    at
    org.apache.maven.project.DefaultMavenProjectBuilder.readModel(Default
    MavenProjectBuilder.java:1134)
    at
    org.apache.maven.project.DefaultMavenProjectBuilder.readModel(Default
    MavenProjectBuilder.java:1094)
    at
    org.apache.maven.project.DefaultMavenProjectBuilder.buildFromSourceFi
    le(DefaultMavenProjectBuilder.java:289)
    at
    org.apache.maven.project.DefaultMavenProjectBuilder.build(DefaultMave
    nProjectBuilder.java:274)
    at
    org.apache.maven.DefaultMaven.getProject(DefaultMaven.java:515)
    at
    org.apache.maven.DefaultMaven.collectProjects(DefaultMaven.java:447)
    at
    org.apache.maven.DefaultMaven.getProjects(DefaultMaven.java:351)
    ... 11 more
    Caused by: org.codehaus.plexus.util.xml.pull.XmlPullParserException:
    parser must
    be on START_TAG or TEXT to read text (position: START_TAG seen
    ...<resources>\r
    \n <filters><filter>... @31:22)
    at
    org.codehaus.plexus.util.xml.pull.MXParser.nextText(MXParser.java:106
    8)
    at
    org.apache.maven.model.io.xpp3.MavenXpp3Reader.parseBuild(MavenXpp3Re
    ader.java:682)
    at
    org.apache.maven.model.io.xpp3.MavenXpp3Reader.parseModel(MavenXpp3Re
    ader.java:2284)
    at
    org.apache.maven.model.io.xpp3.MavenXpp3Reader.read(MavenXpp3Reader.j
    ava:4548)
    at
    org.apache.maven.project.DefaultMavenProjectBuilder.readModel(Default
    MavenProjectBuilder.java:1130)
    ... 17 more
    [INFO]
    -------------------------------------------------------------------------
    ---
    [INFO] Total time: < 1 second
    [INFO] Finished at: Sat Jul 08 14:15:44 EDT 2006
    [INFO] Final Memory: 1M/2M
    [INFO]
    -------------------------------------------------------------------------
    ---
    
    C:\myproject\build\registration>mvn -version
    Maven version: 2.0.2
    
    C:\myproject\build\registration>mvn -e site
    + Error stacktraces are turned on.
    [INFO] Scanning for projects...
    [INFO]
    -------------------------------------------------------------------------
    ---
    [ERROR] FATAL ERROR
    [INFO]
    -------------------------------------------------------------------------
    ---
    [INFO] Error building POM (may not be this project's POM).
    
    Project ID: unknown
    POM Location: C:\myproject\build\registration\pom.xml
    
    Reason: Parse error reading POM. Reason: parser must be on START_TAG or
    TEXT to
    read text (position: START_TAG seen ...<resources>\r\n
    <filters><filter>... @
    31:22)
    
    [INFO]
    -------------------------------------------------------------------------
    ---
    [INFO] Trace
    org.apache.maven.reactor.MavenExecutionException: Parse error reading
    POM. Reaso
    n: parser must be on START_TAG or TEXT to read text (position:
    START_TAG seen ..
    .<resources>\r\n <filters><filter>... @31:22)
    at
    org.apache.maven.DefaultMaven.getProjects(DefaultMaven.java:365)
    at
    org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:278)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:115)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:249)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
    java:39)
    at
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
    sorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:585)
    at
    org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
    at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
    at
    org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
    
    at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
    Caused by: org.apache.maven.project.InvalidProjectModelException: Parse
    error re
    ading POM. Reason: parser must be on START_TAG or TEXT to read text
    (position: S
    TART_TAG seen ...<resources>\r\n <filters><filter>... @31:22)
    at
    org.apache.maven.project.DefaultMavenProjectBuilder.readModel(Default
    MavenProjectBuilder.java:1134)
    at
    org.apache.maven.project.DefaultMavenProjectBuilder.readModel(Default
    MavenProjectBuilder.java:1094)
    at
    org.apache.maven.project.DefaultMavenProjectBuilder.buildFromSourceFi
    le(DefaultMavenProjectBuilder.java:289)
    at
    org.apache.maven.project.DefaultMavenProjectBuilder.build(DefaultMave
    nProjectBuilder.java:274)
    at
    org.apache.maven.DefaultMaven.getProject(DefaultMaven.java:515)
    at
    org.apache.maven.DefaultMaven.collectProjects(DefaultMaven.java:447)
    at
    org.apache.maven.DefaultMaven.getProjects(DefaultMaven.java:351)
    ... 11 more
    Caused by: org.codehaus.plexus.util.xml.pull.XmlPullParserException:
    parser must
    be on START_TAG or TEXT to read text (position: START_TAG seen
    ...<resources>\r
    \n <filters><filter>... @31:22)
    at
    org.codehaus.plexus.util.xml.pull.MXParser.nextText(MXParser.java:106
    8)
    at
    org.apache.maven.model.io.xpp3.MavenXpp3Reader.parseBuild(MavenXpp3Re
    ader.java:682)
    at
    org.apache.maven.model.io.xpp3.MavenXpp3Reader.parseModel(MavenXpp3Re
    ader.java:2284)
    at
    org.apache.maven.model.io.xpp3.MavenXpp3Reader.read(MavenXpp3Reader.j
    ava:4548)
    at
    org.apache.maven.project.DefaultMavenProjectBuilder.readModel(Default
    MavenProjectBuilder.java:1130)
    ... 17 more
    [INFO]
    -------------------------------------------------------------------------
    ---
    [INFO] Total time: < 1 second
    [INFO] Finished at: Sat Jul 08 14:22:03 EDT 2006
    [INFO] Final Memory: 1M/2M
    [INFO]
    -------------------------------------------------------------------------
    ---
    
    C:\myproject\build\registration>
    
    <project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
    http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.myproject.registration</groupId>
    <artifactId>myproject-registration-1.0.jar</artifactId>
    <packaging>jar</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>Patient Information System</name>
    <url>http://www.myproject.com</url>
    <description>Patient Information System</description>
    <dependencies>
    <dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>3.8.1</version>
    <scope>test</scope>
    </dependency>
    </dependencies>
    <build>
    <plugins>
    <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <configuration>
    <source>1.5</source>
    <target>1.5</target>
    </configuration>
    </plugin>
    </plugins>
    <resources>
    <filters><filter>filter.properties</filter></filters>
    <resource><directory>src/main/resources</directory>
    <filtering>true</filtering></resource>
    </resources>
    </build>
    </project>
- 11
  - Pointers in Java: Was Re: Strings...immutable?Wojtek wrote:
    > Patricia Shanahan wrote :
    >
    >> The idea of pointers is not taboo in Java. Indeed, it is the most
    >> pointer-dependent language I have ever used. The taboo is only against
    >> calling pointers "pointers", and even that is broken in a few places,
    >> such as NullPointerException.
    >
    > Yes, but the use of pointers is hidden from view. If you use pointers,
    > then you should be able to have an array of pointers. Which means that
    > you should be able to do pointer arithmetic.
    
    A Java String[] is an array of pointers.
    
    Pointer arithmetic, if available, can be used to construct array access.
    However, that is rather like saying "A general GOTO can be used to build
    structured statement organizations such as if-then-else."
    
    A language can provide array access, including access to arrays of
    pointers, without providing pointer arithmetic, just as easily as a
    language can support if-then-else without having a general GOTO.
    
    >
    > There are no pointers to pointers. Each Java object reference "points"
    > to an actual object, not a reference to that object.
    
    I'm not at all sure what this means. It is the fact that a Java
    reference "points" in the sense of identifying an object makes it a pointer.
    
    >
    > So while yes Java uses pointers beneath the hood, they are not exposed
    > to the developer.
    >
    
    How do you classify the parameter passing in the call to myMethod in the
    following program? Call by reference? Call by value? Call by name? Or what?
    
    I consider it to be call by value, where the parameter myBuf is a
    pointer to the StringBuffer instantiated in main.
    
    public class CallByQuestion {
    static StringBuffer x;
    public static void main(String[] args) {
    StringBuffer myBuf = new StringBuffer();
    x = myBuf;
    System.out.println("Before call:");
    System.out.printf(" x==myBuf is %b%n",x==myBuf);
    System.out.printf(" myBuf contents: %s%n", myBuf.toString());
    myMethod(myBuf);
    System.out.println("After call:");
    System.out.printf(" x==myBuf is %b%n",x==myBuf);
    System.out.printf(" myBuf contents: %s%n", myBuf.toString());
    }
    
    private static void myMethod(StringBuffer myBuf) {
    StringBuffer y = myBuf;
    myBuf = new StringBuffer("Some data");
    System.out.println("Inside myMethod:");
    System.out.printf(" x==myBuf is %b%n",x==myBuf);
    System.out.printf(" myBuf contents: %s%n", myBuf.toString());
    y.append("Some other data");
    }
    }
    
    More generally, how would you go about predicting and explaining the
    output from the program?
    
    Before call:
    x==myBuf is true
    myBuf contents:
    Inside myMethod:
    x==myBuf is false
    myBuf contents: Some data
    After call:
    x==myBuf is true
    myBuf contents: Some other data
    
    I believe that it is easier to visualize, predict, and explain Java
    program behavior in terms of pointers than by trying to hide them.
    
    Patricia
- 11
  - MySQL and Java...Hi,
    
    *
    This is probably a FAQ, but I am doing what Connector/J Documentation tells
    me to do...it still cannot work...so, please read on...
    *
    
    I am trying to write an applet that will display some data from a database
    server.
    I run apache, mysql on the same machine (say, 192.168.1.2) and privileges
    have been granted to root @ 192.168.1.1 and 192.168.1.2.
    I test my application implement from 192.168.1.1 and it works fine, which
    implies TCP connection to mysql is working.
    However, when I access the applet implement from 192.168.1.1 via web
    browser, Java Console would report a java.security.AccessControlException.
    But...the applet is served by the very same machine that runs mysql! What
    did I miss? (I put the applet on the machine running mysql, without signing
    the applet)
    
    Thank you very much!!
    
    Have a nice day!
    
    Eureka
- 14
  - Calendar get methodHello,
    
    I know there are a lot of issues with the Calendar class in Java (from
    my searches anyway), but I can't seem to find one for my simple
    question. When using the get methods of the calendar class, which
    timezone is it using? I've changed the default time zone using
    TimeZone.setDefault and have set the timezone of the Calendar object
    itself, but it seems to keep returning values for a GMT timezone. Where
    can I set it so the get methods of the Calendar class return the
    correct values for a timezone I specify?
    
    T.Ramos
- 14
  - Web Page to String Conversion?I'm working on a project that needs a string representation of a
    particular html document found online. Although the document contains
    only plain text, it is a generated page and thus, the url does not end
    with "/filename.html". I only need the text on the page in the string,
    but a string copy of the page's source code would acceptable as well
    since I can just trim the html tags out. Unfortunately, I have no idea
    how to do any of this. If it helps, I'm using MRJ SDK 2.2. Any advice
    you can give would be appreciated.
- 15
  - Problem with reading all rows in excel sheetHi all.
    
    I'm trying to read an excel file in Java (it contains 2 columns of number).
    But for some reason, when reading it I'm not getting the first reccord. In
    other words, the following code display the data from row 2 and +.
    
    public void test()
    {
    try{
    Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
    Connection con =
    DriverManager.getConnection("jdbc:odbc:Driver={Microsoft Excel Driver
    (*.xls)};DBQ=Data/Chimique.xls");
    Statement st = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
    ResultSet.CONCUR_READ_ONLY);
    ResultSet rs = st.executeQuery( "Select * from [CHL_F$]" );
    while (rs.next())
    {
    System.out.println(rs.getString(1) + " " + rs.getString(2));
    }
    rs.close();
    st.close();
    }
    catch(Exception ex) {
    System.err.print("Exception: ");
    System.err.println(ex.getMessage());
    }
    }
    
    Best regards,
    Phil
- 16
  - Can interface throw exception?Hi.
    
    Can an interface method "throw" an exception? By this, I mean, can an
    interface have a method whose signature includes "throws <some
    exception>"?
    
    If so, is this available in Java 1.3 and 1.4?
    
    Thanks,
    
    Ken
- 16
  - commons-httclient: Request URI in protokol headerHello,
    
    I have a problem with the commons-httpclient package (jakarta). Suppose
    I want to send a POST request (PostMethod in commons-httpclient) to the
    URL http://my-server:9999/Test. The commons-httpclient generates a
    request looking like this:
    
    POST /Test HTTP/1.1
    User Agent: Jakarta Commons-HttpClient/3.0-rc2
    HOST: my-server:9999
    ...
    
    This is a valid request. But in our intranet the request is blocked by
    a firewall, because of the relative path in the request line (first
    line). The firewall needs a request like this:
    
    POST http://my-server:9999/Test HTTP/1.1
    User Agent: Jakarta Commons-HttpClient/3.0-rc2
    HOST: my-server:9999
    ...
    
    This format is mandatory (RFC 2616) if the request is send via a proxy.
    I've examined the commons-httpclient code and found out that the
    complete URL is written in the request line if I set a proxy in the
    HttpClient class (in the HostConfiguration). But I don't know the URL
    of the proxy where the firewall runs. Is there another way to force the
    commons-httpclient to write the full URL?
    
    I've tried to set the destination server as proxy, too (in the example
    above I've set my-server:9999 as proxy). This worked in a local
    environment. I haven't tested if this will work in our intranet (since
    the test will take some time) and it also looks a little bit like a
    dirty workaround to me.
    
    Regards
    Markus

Author

Message

mergaite_lietuvaite

Posted: 2004-2-25 20:57:00

Top

java-programmer, DefaultTreeCellRenderer hi,

I want remove the icon, that stays by a TreeNode lefts, that has got
any TreeNodes. The icon presents, the TreeNode is either expanded or
collapsed.

(I am meaning not the icon, that can you remove with:
defaultTreeCellRenderer.setLeafIcon(null);
defaultTreeCellRenderer.setClosedIcon(null);
defaultTreeCellRenderer.setOpenIcon(null);
)

thank You a lot for any help!!!

Joana

Posted: 2004-2-26 1:19:00

Top

java-programmer >> DefaultTreeCellRenderer > I want remove the icon, that stays by a TreeNode lefts, that has got
> any TreeNodes. The icon presents, the TreeNode is either expanded or
> collapsed.
>
> (I am meaning not the icon, that can you remove with:
> defaultTreeCellRenderer.setLeafIcon(null);
> defaultTreeCellRenderer.setClosedIcon(null);
> defaultTreeCellRenderer.setOpenIcon(null);
> )
>
> thank You a lot for any help!!!

JTree#setShowsRootHandles(false);

____________

http://reader.imagero.com the best java image reader.

Index ‹ java-programmer

Next
- 1
  - Switching GTK theme on Java 1.6 (i.e., mustang)I'm at a loss on how to change on-the-fly the theme (i.e., resource) for the
    GTK look and feel on Java 1.6 (Mustang). On 1.5 it was a simple matter of
    setting a system property (i.e., "swing.gtkthemefile") like this:
    System.setProperty ("swing.gtkthemefile", fGTKThemeFile);
    
    But on Mustang it has been completely changed.
    
    It is probably just as easy but I'm missing something?
    
    Thanks.
    
    Karl
    email***@***.com
- 2
  - In Search Of: Abstract Algebra system.I'd like to use an abstract algebra engine of some sort to define 3d
    shapes and their intersections.
    
    For example, I would like to create a structure for a Sphere that is
    represented by (P - P0) dot (P - P0) <= R0*R0
    where R0 and P0 are constants.
    
    And the intersections of two Spheres, is represented by a system of
    inequalities:
    
    [(P - P0) dot (P - P0) <= R0*R0,
    (P - P1) dot (P - P1) <= R1*R1]
    
    I'd also like to be able to determine the intersection points of the
    surface of this system with a Ray.
    
    The actual goal is to create a Beam Casting project in Java. Beam
    Casting is like Ray Casting, but you start with a pyramid instead of a ray.
    
    I've found a library called Java Algebra System 2.0, but I'm confused on
    how to apply it toward my goal. If there is anything more specifically
    tailored to my problem, or someone can help me understand JAS, I'd
    greatly appreciate the info.
    
    Thanks,
    Daniel.
    --
    Daniel Pitts' Tech Blog: <http://virtualinfinity.net/wordpress/>
- 3
  - tomcat - web service in a warHello I have the following problem. Normally when creating a JSP
    application I put all files in a web archive (.war file) which makes it
    possible to transfer the app to the webapps dir of another server and
    the app is deployed directly by the application manager.
    
    Also in the folder /axis/WEB-INF/classes I already have some
    precompiled web services, which are running perfectly.
    
    My question is, is there also a default way for creating .war file of a
    web service (and related files) in such a way that I can put the .war
    file in the axis dir on another server, and everything is going to work
    directly (auto-deployment in axis dir?)
- 4
  - Client Code for Axis - Newbie QuestionHi,
    
    I'm a first time Axis 1.1 user and trying to figure out how to write
    web services client code. I used WSDL2JAVA to create java source from
    the wsdl. I ended up with the following files...
    
    xxxx_Port.java
    xxxx_Service.java
    xxxx_ServiceLocator.java
    xxxxBindingStub.java
    xxxxRequest.java
    xxxxResponse.java
    
    Does anyone have some sample code they can share with me that shows
    the basics of how to set up the request and response parameters and
    then actually make the call to the web service. Not sure which
    classes or methods to use.
    
    Thanks
- 5
  - log4j as a static class ?Hello all,
    every example I found for log4j tells you to declare a final static
    variable to hold the reference to log4j Logger for each of your classes
    -by means of Logger.getLogger(Myclass.class)
    
    What about my approach?
    
    package mypackage;
    
    import org.apache.log4j.Logger;
    
    public final class Log {
    public static org.apache.log4j.Logger log =
    Logger.getLogger(Log.class);
    
    private Log(){
    }
    }
    
    Then, from within any class I need to log something, I simply call
    Log.log.myloglevel("something");
    
    Is this wrong?
    
    Thanks,
    regards
    
    Matteo
- 6
  - connection pooling to oracle in sun serverplz help me how connection pooling to oracle is done on a sun server
- 7
  - Applet Security (File Transfer) QuestionsI've looked through a few books and various web sites. I'm still not clear
    on this and would like to make sure I have this right.
    
    I would like to use an applet in a web page. When the user presses an
    "UPLOAD" button, a file chooser would appear, the user could select a file,
    then the applet would read the file in and (instead of a regular upload),
    e-mail it to a specific address (a program will be reading the emailed
    files and processing them).
    
    I think I read that as long as the user specified a specific filename (like
    with a file chooser) and I converted the filename to a URL, I could read
    that file without having a signed applet. Is this true? Can I read in a
    specific file from an applet and e-mail it somewhere?
    
    And, if I can't, it looks like it is really easy to sign an applet. Is it
    as easy to create a signed class as it looks? If I upgrade the applet, do
    I have to have it re-signed or done over so the new version is recognized
    too?
    
    Thanks!
    
    Hal
- 8
  - Transparency in Java ImagingHi all!
    
    When I have multiple images in Java (I'm using JAI, but I thing this has
    to do with ColorModel, which is present in AWT) which I want to stack
    above each other, is there any possibility to define white as
    "transparent", i.e. whenever an image contains white pixels they should
    not be drawn... any ideas?
    If this is impossible, how else do I use transparency when drawing
    images? (i.e. how can I stack them, without each overwriting the image
    below it)?
    
    thanks in advance and kind regards,
    
    Messi
- 9
  - [ADV] Java GUI test tool qftestJUI version 1.4 released
    Quality First Software (QFS) is pleased to announce the release of
    version 1.4 of qftestJUI - The test tool for Java User Interfaces.
    
    The is the second medium upgrade for qftestJUI since the release of
    version 1.0 in October 2002. Along with a greatly improved and
    extended tutorial, the highlights of this upgrade are support for Java
    WebStart, extended support for distributed development through an
    include mechanism and dependency tracking across multiple test-suites.
    
    An evaluation version is freely available for download at
    
    http://www.qfs.de/en/qftestJUI/download.html
    
    where you'll also find a link to the latest release notes.
    
    What is it?
    ===========
    
    Based on capture/replay, but extending far beyond, qftestJUI manages
    the creation and execution of automated tests for Java/Swing
    applications with a graphical user interface. It runs on Windows and
    all major Unix systems with JDKs from 1.1.8 to 1.4.2.
    
    The key feature of qftestJUI is an exceptionally high test
    reusability, minimizing the effort necessary for regression testing.
    Intuitive graphical design of tests reduces the cost of introducing
    qftestJUI into the QA process. Additionally, qftestJUI sports a set of
    features for the advanced user such as variables, procedures and
    scripting. Extensive documentation, including a tutorial, is available
    for users approaching the product with different background and skill
    levels.
    
    For detailed product description and free evaluation please visit
    
    http://www.qfs.de/en/qftestJUI/index.html
    
    --
    Gregor Schmid email***@***.com
    Quality First Software GmbH http://www.qfs.de
- 10
  - Clarification of OS "advancement"In comp.os.linux.advocacy, I heard Tim Tyler say:
    >In comp.lang.java.advocacy T. Max Devlin <email***@***.com> wrote or quoted:
    >> In comp.os.linux.advocacy, I heard Tim Tyler say:
    >>>In comp.lang.java.advocacy T. Max Devlin <email***@***.com> wrote or quoted:
    >>>> In comp.os.linux.advocacy, I heard Tim Tyler say:
    >>>>>> In comp.os.linux.advocacy, I heard Tim Tyler say:
    >>>>>>>In comp.lang.java.advocacy T. Max Devlin <email***@***.com> wrote or quoted:
    >>>>>>>> In comp.os.linux.advocacy, I heard Jorn W Janneck say:
    >>>>>>>>>In comp.lang.java.advocacy T. Max Devlin <email***@***.com> wrote:
    >
    >>>>>>>>>> It is, on the face of it, impossible, what he says. Businesses do
    >>>>>>>>>> not and should not spend money on things without expecting to own
    >>>>>>>>>> them once they do.
    >>>>>>>>>
    >>>>>>>>>eclipse-ibm?
    >>>>>>>>
    >>>>>>>> What about it? [...]
    >>>>>>>
    >>>>>>>I think he means Eclipse refutes the idea you expressed above - that
    >>>>>>>businesses do not and should not spend money on things without expecting
    >>>>>>>to own them.
    >>>>>>>
    >>>>>>>IBM has invested a lot of money in Eclipse - but it doesn't own it.
    >
    >[...]
    >
    >>>>>That wasn't the thesis you presented above. What you wrote was:
    >>>>>
    >>>>>``Businesses do not and should not spend money on things without
    >>>>> expecting to own them once they do.''
    >>>>>
    >>>>>A simple counter-example neatly dispenses with that thesis.
    >>>>
    >>>> I'm afraid not. It would be nice if an /apparent/ counter-example, however
    >>>> simple, could refute economic truth. Or maybe it wouldn't be.
    >>>>
    >>>> Either way, your counter-thesis would have to be "businesses should spend
    >>>> money on things without expecting to own them once they do", which is
    >>>> clearly preposterous.
    >>>
    >>>You seem to be experiencing some difficulty with inverting a thesis.
    >>>
    >>>The opposite of "do not and should not" is not "should" - it is:
    >>>"do or are not morally prohibited from".
    >>
    >> Yea, sure.
    >
    >Try it on for size.
    >
    >Your own argument leads to a conclusion which is anything but preposterous
    >if you use valid forms of reasoning.
    
    My statement was true. That you can extend it to absurd lengths by pretending
    it is a mathematical claim and then find it lacking because it is not is a
    problem for you, not for me.
    --
    T. Max Devlin
    *** It's 2003! Why can't I teleport?!? ***
    -- Louis Black
- 11
  - -Xms setting makes IE exitFolks,
    
    My company uses a Java based server application, and Internet Explorer
    on our client machines. Recently our server application was upgraded,
    and instead of needing Microsoft's JVM on the client machines we are
    now using Sun Java version 1.4.2_08.
    
    Performance around applet caching was poor, and the recommended cure
    for that was to set "-Xms128m -Xmx256m" in the Java Runtime
    Parameters from the Java control panel. On machines that have never had
    the Microsoft JVM installed this fixed the problem.
    
    However, on machines that have had the JVM installed, this causes the
    browser to exit whenever an applet is started. From doing some research
    it seems this problem is usually caused by a conflict between the Sun
    and Microsoft Java components. So the JVM was uninstalled using the
    process detailed here: -
    http://www.java.com/en/download/help/uninstall_msvm.xml#cli
    (That is identical to the steps found on Microsoft's knowledgebase)
    
    After a lot of experimentation I have found that setting only the
    starting memory setting "-Xms64m" does not cause any problems.
    However this is clearly far from ideal and I am looking for a better
    solution. Does anybody have any suggestions?
    -----
    Lewis
- 12
  - How to deprecated a method in a class?I would like to deprecated some methods in my
    class. So next time when people use those methods,
    they will get the warning messages during compiling.
    
    If you know how, please let me know.
    Thank Q very much in advance!
- 13
  - Java Everywhere videoCool cool video, matrix-like, about Java Everywhere.
    
    http://www.youtube.com/watch?v=NW2WKCai2Kg
    
    The REALLY funny thing is it's in Flash version 8, which just goes to
    show Java may be everywhere, but there are degrees of everywhere even
    in this.
- 14
  - [signed applet] certification authorityHi,
    I have a signed applet (signed myself with jarsigner.exe).
    It works fine but the users get a warning message before accepting the
    applet to execute.
    Next step, is to have my certificate trusted by Verisign or other
    third party.
    Do you know any link to a site that would explain the procedure to
    follow in details ?
    Which certification authority would you recommend ? the cheapest ?
    
    thanks
- 15
  - ATI or NVidia - best for Java3d?I'm contemplating purchasing a new graphics
    card, and would like to purchase one that
    performs well with Java3D.
    
    Which begs two questions:
    
    1. Which moderately high end card is
    better: ATI, or Nvidia? Given the current
    controversy relating to Half Life 2 and these two
    cards, I'm frankly a tad unsure!
    
    2. Is there a well-known benchmark written in Java3d
    to make the card choice a little easier?
    
    Many thanks in advance!
    
    David