java-programmer >>creating an ESRI shapefile

creating an ESRI shapefile

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- 2
  - Secure access to database applicationHi All
    
    Just looking for a bit of advice. I have an muti-user application
    that I'm developing that talks to an Oracle database. What's the best
    way (or at least a good way!) of securing user + password access to
    the program? I've currently got a user table in the database and I
    fetch whether the login credentials match what's in that table - but I
    log in as an admin user to the DB in order to fetch the user table, so
    admin password is coded into the application - this is obviously
    bad.
    
    Ideas? I presume there's a standard way of doing these kinds of
    things :o)
- 5
  - Date ArithmeticArg,
    
    So I know I use the Calendar abstract class. And I am betting that I use
    the Add method.
    Could I see a example of some date arithmetic, e.g. number of days from
    today since 01/01/1964.
    
    Must I work out the differences by year, month, day individually, convert to
    a common unit of time, add them, then convert to a displayable unit of time?
    
    Struggling...
- 5
  - too long filename? ? ?Hi
    If i do the following, it will throw exception because the filename
    is too long. How to fix it? I am using JBuilder X, JDK 1.4.2 and
    windows XP.
    
    try{
    FileOutputStream f = new
    FileOutputStream("projects\\os\\2004_03_04_JBuilderX\\2004_03_04_extras\\2004_03_04_BorlandXML\\2004_03_04_doc\\2004_03_04_api-doc\\2004_03_04_com\\2004_03_04_borland\\2004_03_04_xml\\2004_03_04_service\\2004_03_04_simpledb\\2004_03_04_jxinfo\\2004_03_04_ColumnName.html");
    }catch (Exception ee){
    ee.printStackTrace();
    }
    
    All the sub directory is exsit!!!
    
    thanks
    from Peter (email***@***.com)
- 6
  - [Struts] ActionForm not displayed"Hamvil" <email***@***.com> wrote in message
    news:email***@***.com...
    
    > Basically i would like to fill a form with the data obtained from a
    > database. Here follow a small part of the code:
    >
    > try {
    > actionForm = registerManager.loadProfile(id);
    > } catch (Exception e) {}
    >
    > basically actionForm is the one passed by the execute mathod.
    >
    > The method loadProfile returns an object RegisterBean (which extends
    > ActionForm) that contain the user data loaded from the database.
    
    I don't think you're supposed to construct your own form-- there's more to
    it than the data. If you look at the API, you'll see some other attributes
    that your own form is probably missing.
    http://struts.apache.org/api/org/apache/struts/action/ActionForm.html
    
    There is a way to ask the framework to make you a new form bean, but in this
    case you don't really need that.
    
    Instead of trying to replace the form bean with your own, try copying all of
    the matching properties into it with:
    BeanUtils.copyProperties( form, objectFromDatabase );
    
    The Struts example webapp has an example of prepopulating a form. Using
    forms as Data Transport Objects is generally frowned upon as it
    unnecessarily couples your data access layer to Struts.
    
    --
    Wendy
- 7
  - String ExternalizationI know, generally, hard coding strings is not the best thing in the
    world to do. However, if I am not planning on changing those strings
    (especially if the application has already been written - and it's
    big), is there any reason to incur the overhead (time to implement,
    overhead of the use of Properties, etc) to convert an application so
    it uses a .properties file.
    
    Just curious what other developer opinions are.
    
    Thanks.
- 7
  - BPEL Products(Business prcess execution Language 4 webservices)Hi,
    I had a few questions about BPEL products
    1) Can you let me know the BPEL Servers available in the market. Do
    these need to be integrated with J2EE appservers or can they run as is
    if all I want to do is integrate a few Java applications and
    webservices to the flow.
    2) How powerful are Weblogic Integration suite and Websphere MQSeries
    Integrator for integrating Webservices using BPEL. Also how easy is it
    to develop this kind of flow. Collaxa has a more pure BPEL product
    that seems easier for the above task.
    
    Thanks in Advance,
    Regards,
    Rahul
- 7
  - Newbie Question: LayoutsI've been having the toughest time with this....
    I want to have a JFrame with 3 containers in it.
    The containers are laid out top to bottom.
    Inside the first 2 containers I want 4 rows of a JLabel and
    JTextField. Components are lined up in both containers so that the
    labels end and textfields start at the same place on each line. These
    two containers also have a titled borders, as does the third container
    which is just a JTextArea. My questions are: what type should these
    containers be? what type of layout should I use for them (and what
    should the parameters to the method be if any)?
    
    Thanks.
- 7
  - System clock monitoringwe have a java applet game that relies on a thread that ticks at 10n
    miliseconds. Our problem is that we use the system clock time to see
    the interval of ticks, and if a user manipulates the clock setting,
    then we get erronous tick times.
    
    Is there a way we can avoid this, or use the hardware clock , or some
    solution where the user inteferenece will not disrupt the game ?
    
    Thanks for all your suggestions,
    -Vidhi.
- 8
  - grabbing text from non-edit java windowHow do I get the text (in a java program) from a java window that is not an
    edit window (ie, cannot hilight the text with a mouse)? ie, is there
    something similar to in functionality to Windows API GetWindowText()?
- 8
  - To smooth the movements of the mouseOn 19 jul, 07:45, Miss Elaine Eos <email***@***.com>
    wrote:
    > In article <email***@***.com>,
    >
    > email***@***.com wrote:
    > > In my program, when I want to rotate or translate, movements abrupt.
    > > How would you smooth the movements of the mouse?
    >
    > Abrupt in what way? Is it jerky? Smooth but too fast? Not able to do
    > small movements?
    >
    > --
    > Please take off your pants or I won't read your e-mail.
    > I will not, no matter how "good" the deal, patronise any business which sends
    > unsolicited commercial e-mail or that advertises in discussion newsgroups.
    
    ? ummm...It seems that you are dangerous...jijiji
    
    Well, well. Movements, like the rotation, are too fast.If I move a
    little the mouse, the scene is moved very fast.
    
    I Can I make it slower?
    
    (Sorry for my writing. I'm not english, and I'm beginning with the
    English...^_^ )
    
    Thanks
- 8
  - Graphics2D to ImageIcon problemI'm trying to do something that should be very simple.
    
    I want to create an applet (or application, doesn't matter) to display a set
    of drawn objects (drawn with a Graphics2D object). I want to be able to display
    these objects in a pane by choosing them from a combo box. Two panes, one
    on top with the combo box, one on the botton with the graphic.
    
    I managed to get the images to be drawn in a simple panel stacked next to
    each other but I really want to be able to select them and have them drawn
    one at a time when selected in the combo box.
    
    My program currently just instantiatest my classes that do the Graphics2D
    drawing (the classes extend JPanel and just have a paint method in them)
    and puts them in a grid layout.
    
    REAL QUESTION: I would like to create an ImageIcon and just update it
    with a new image when the combo box selection changes.
    The problem is I can't seem to find a way to convert a
    BufferedImage or a Graphics2D object into an ImageIcon.
    Should I be doing this in a different way?
    
    I don't work with JAVA everyday (though I love the language) and GUI and
    graphics things just frustrate me to no end. I still haven't got the right
    model in my head.
    
    Any help would be very apprciated. Thanks,
    
    James Kimble
    
    --------------------------------------------------------------------------
    
    Here's the code I have at the minute:
    
    Main calling class:
    
    //v 1.3
    import java.awt.*;
    import java.awt.geom.*;
    import java.awt.event.*;
    import java.util.*;
    import java.math.*;
    import javax.swing.*;
    import java.net.URL;
    
    public class DSP1 implements ActionListener
    {
    final static int NUM_IMAGES = 8;
    final static int START_INDEX = 3;
    
    JLabel waveLabel = null;
    
    JPanel mainPanel, noisePanel, sinePanel, noisesinePanel, stonPanel;
    JPanel selectPanel, displayPanel, wavePanel;
    
    JComboBox rateChoices = null;
    JComboBox freqChoices = null;
    JComboBox waveOption = null;
    
    // Constructor
    public DSP1()
    {
    // Create the main panel to contain the two sub panels.
    mainPanel = new JPanel();
    mainPanel.setLayout(new GridLayout(2,1,5,5));
    mainPanel.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
    
    selectPanel = new JPanel();
    displayPanel = new JPanel();
    
    waveLabel = new JLabel();
    waveLabel.setHorizontalAlignment(JLabel.CENTER);
    waveLabel.setVerticalAlignment(JLabel.CENTER);
    waveLabel.setVerticalTextPosition(JLabel.CENTER);
    waveLabel.setHorizontalTextPosition(JLabel.CENTER);
    waveLabel.setBorder(BorderFactory.createCompoundBorder(
    BorderFactory.createLoweredBevelBorder(),
    BorderFactory.createEmptyBorder(5,5,5,5)));
    
    waveLabel.setBorder(BorderFactory.createCompoundBorder(
    BorderFactory.createEmptyBorder(0,0,10,0),
    waveLabel.getBorder()));
    
    waveLabel.setText("");
    
    String[] Wave = { "Sine", "Noise", "Sine + Noise", "Signal/Noise" };
    waveOption = new JComboBox( Wave );
    waveOption.setSelectedIndex ( 1 );
    
    // Add border around the select panel.
    selectPanel.setBorder(BorderFactory.createCompoundBorder(
    BorderFactory.createTitledBorder("Select Phase"),
    BorderFactory.createEmptyBorder(5,5,5,5)));
    
    // Add border around the display panel.
    displayPanel.setBorder(BorderFactory.createCompoundBorder(
    BorderFactory.createTitledBorder("Display Phase"),
    BorderFactory.createEmptyBorder(5,5,5,5)));
    
    selectPanel.add(waveOption);
    displayPanel.add(waveLabel);
    
    mainPanel.add ( selectPanel );
    mainPanel.add ( displayPanel );
    
    waveOption.addActionListener(this);
    }
    
    // Implementation of ActionListener interface.
    public void actionPerformed(ActionEvent event)
    {
    if ( "comboBoxChanged".equals(event.getActionCommand()) )
    {
    
    System.out.println ( "In action: " +
    waveOption.getSelectedIndex() );
    
    switch ( waveOption.getSelectedIndex() )
    {
    case 0: wavePanel = new SineWave();
    displayPanel.add(wavePanel);
    break;
    case 1: wavePanel = new NoiseWave();
    mainPanel.add(wavePanel);
    break;
    case 2: wavePanel = new NoiseSineWave();
    mainPanel.add(wavePanel);
    break;
    case 3: wavePanel = new SignaltoNoise();
    mainPanel.add(wavePanel);
    break;
    }
    }
    }
    
    // main method
    public static void main(String[] args)
    {
    // create a new instance of DSP1
    DSP1 dsp_1 = new DSP1();
    
    // Create a frame and container for the panels.
    JFrame dsp1Frame = new JFrame("Lunar Phases");
    
    // Set the look and feel.
    try
    {
    UIManager.setLookAndFeel(
    UIManager.getCrossPlatformLookAndFeelClassName());
    } catch(Exception e) {}
    
    dsp1Frame.setContentPane(dsp_1.mainPanel);
    dsp1Frame.setBounds(300,300,500,500);
    
    // Exit when the window is closed.
    dsp1Frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    
    // Show the converter.
    //dsp1Frame.pack();
    dsp1Frame.setVisible(true);
    }
    }
    
    Drawing class (they're all the same format):
    
    import java.awt.*;
    import java.awt.geom.*;
    import java.awt.image.*;
    import java.awt.event.*;
    import java.util.*;
    import java.math.*;
    import javax.swing.*;
    import java.net.URL;
    
    class SineWave extends JPanel
    {
    static int rate;
    
    public void paint (Graphics g)
    {
    Graphics2D g2D; // Get a Java 2D device context
    
    super.paint(g);
    
    g2D = (Graphics2D)g; // Get a Java 2D device context
    
    g2D.drawString("Sine Wave", 250, 10); // Draw some text
    g2D.drawString(" 100", 15, 95 ); // Draw some text
    g2D.drawString(" 0", 15, 205); // Draw some text
    g2D.drawString("-100", 15, 305); // Draw some text
    
    g2D.drawLine ( 40, 200, 460, 200 );
    
    int old_x = 50;
    int old_y = 200;
    int new_x = 50;
    int new_y = 200;
    
    for ( int i=1; i <= 100; i++ )
    {
    old_x = new_x;
    old_y = new_y;
    
    new_x += 4;
    new_y = (int)(((Math.sin((6.2830/100.0)*i))*100)+200.0);
    
    //System.out.println ( "From: " + old_x + ", " + old_y +
    // " To: " + new_x + ", " + new_y );
    
    g2D.drawLine ( old_x, old_y, new_x, new_y );
    }
    }
    
    public static void setRate ( int r )
    {
    rate = r;
    }
    }
- 8
  - a cuestionHello
    
    Which is the utility of declaring a interface without methods in Java?
    
    thanks
- 12
  - Import Map.class wrong version errorHi There....
    
    I'm running into these import problems....
    I'm trying to import the java.util.Map and java.util.HashMap Class on a
    IBM AIX server running java 1.4.2.
    
    Could anyone please help me in identifying what is that I am doing
    wrong....
    I have core.jar that has these files in the Lib dir...but still I get
    the error...notably it says it is Wrong version 48 expecting 45....
    
    I have no idea of this error could b....
    
    Appreciate your response
    
    /u/sharadch> $CLASSPATH
    ksh:
    /usr/java14/jre/lib/core.jar:/adw/adwinsp1/sqllib/java/db2java.zip:/adw/adwinsp1/sqllib/java/db2jcc.jar:/adw/adwinsp1/sqllib/java/sqlj.zip:/adw/adwinsp1/sqllib/function:/adw/adwinsp1/sqllib/java/db2jcc_license_cisuz.jar:/adw/adwinsp1/sqllib/java/db2jcc_license_cu.jar:.:
    not found.
    /u/sharadch> $PATH
    ksh:
    /usr/java14/jre/bin:/opt/oracle/product/9.2.0/bin:/usr/bin:/usr/ucb:/etc:/usr/dt/bin:/usr/bin:/usr/ucb:/etc:/usr/dt/bin:/usr/bin:/usr/ucb:/etc:/usr/dt/bin:/usr/bin:/usr/ucb:/etc:/usr/dt/bin:/usr/bin:/usr/ucb:/etc:/usr/dt/bin:/opt/openlink5/bin:/opt/openlink5/samples/ODBC:/usr/bin:/etc:/usr/sbin:/usr/ucb:/usr/bin/X11:/sbin:/usr/java130/jre/bin:/usr/java130/bin:/usr/local/bin:/u/sharadch/bin:/opt/sas:/usr/local/bin:/opt/ks/bin:/opt/openlink5/bin:/opt/datamart/utilities:/usr/atria/bin:/adw/adwinsp1/sqllib/bin:/adw/adwinsp1/sqllib/adm:/adw/adwinsp1/sqllib/misc:/usr/bin:/etc:/usr/sbin:/usr/ucb:/u/sharadch/bin:/usr/bin/X11:/sbin:
    not found.
    /u/sharadch> cat HelloWorld.java
    import java.util.Map;
    import java.util.HashMap;
    
    class HelloWorld {
    public static void main(String args[]) {
    
    System.out.print("Java Works !!!! ");
    
    }
    }/u/sharadch> javac HelloWorld.java
    error: Invalid class file format:
    /usr/java14/jre/lib/core.jar(java/util/Map.class), wrong version: 48,
    expected 45
    HelloWorld.java:1: Class java.util.Map not found in import.
    import java.util.Map;
    ^
    error: Invalid class file format:
    /usr/java14/jre/lib/core.jar(java/util/HashMap.class), wrong version:
    48, expected 45
    HelloWorld.java:2: Class java.util.HashMap not found in import.
    import java.util.HashMap;
    ^
    error: Invalid class file format:
    /usr/java14/jre/lib/core.jar(java/lang/Object.class), wrong version:
    48, expected 45
    HelloWorld.java:4: Superclass java.lang.Object of class HelloWorld not
    found.
    class HelloWorld {
    ^
    6 errors
- 12
  - DSHOW filter graph displayed in a java object??I am getting ready to start looking at integrating a standalone DSHOW viewer
    into a java2 applet that we use for control. I know that using JMF, you can
    do a media player but I simply want a window that display the DSHOW output
    as part of the applet running in IE under WinXP. I currently have a static
    JPEG view but want to modify for motion video.
    
    Thanks for any ideas.
    
    Doug George
- 15
  - imcompatible type when converting a List to arrayI have an ArrayList<Guest> which I want to convert to an Array, but I'm
    getting:
    
    init:
    deps-jar:
    Compiling 2 source files to /home/thufir/JavaProject28/build/classes
    /home/thufir/bcit-comp2611-project2/src/a00720398/view/Tabs.java:15:
    incompatible types
    found : java.lang.Object[]
    required: a00720398.data.Guest[]
    Guest some_guests[] = FileUtil.getGuests().toArray();
    1 error
    BUILD FAILED (total time: 6 seconds)
    
    If I change it to:
    
    Object some_guests[] = FileUtil.getGuests().toArray();
    
    then it works fine, but that's rather absurd because I know that the type
    is Guest so I don't see why it would have to be an array of Object.
    
    Surely I don't have to cast to Guest?
    
    thanks,
    
    Thufir

Author

Message

spud_g00

Posted: 2007-7-12 2:45:00

Top

java-programmer, creating an ESRI shapefile I need to create an ESRI shapefile set (.shp, .shx, .dbf) from an
object. The object is drawn to the screen -- or any Graphics2D -- via
its draw() method, so a good starting point would be an implementation
of Graphics2D which writes to a shapefile instead of the screen.

Does anybody know of a good library to help with the creation of
shapefiles in Java?

Brandon McCombs

Posted: 2007-7-14 7:52:00

Top

java-programmer >> creating an ESRI shapefile email***@***.com wrote:
> I need to create an ESRI shapefile set (.shp, .shx, .dbf) from an
> object. The object is drawn to the screen -- or any Graphics2D -- via
> its draw() method, so a good starting point would be an implementation
> of Graphics2D which writes to a shapefile instead of the screen.
>
> Does anybody know of a good library to help with the creation of
> shapefiles in Java?
>

Does ESRI provide anything in their APIs?

Spud Demon

Posted: 2007-7-14 10:08:00

Top

java-programmer >> creating an ESRI shapefile On Jul 13, 11:52 pm, Brandon McCombs <email***@***.com> wrote:
> email***@***.com wrote:
> > I need to create an ESRI shapefile set (.shp, .shx, .dbf) from an
> > object. The object is drawn to the screen -- or any Graphics2D -- via
> > its draw() method, so a good starting point would be an implementation
> > of Graphics2D which writes to a shapefile instead of the screen.
>
> > Does anybody know of a good library to help with the creation of
> > shapefiles in Java?
>
> Does ESRI provide anything in their APIs?

As a matter of fact their MapObjects product does. But the project
I'm doing this for doesn't use MapObjects, and it would be more
complicated to convert my data to MapObjects features than to
implement my own shapefile writer.

Same goes for OpenMap.

Jim Korman

Posted: 2007-7-15 3:23:00

Top

java-programmer >> creating an ESRI shapefile On Fri, 13 Jul 2007 19:07:41 -0700, Spud Demon
<email***@***.com> wrote:

>On Jul 13, 11:52 pm, Brandon McCombs <email***@***.com> wrote:
>> email***@***.com wrote:
>> > I need to create an ESRI shapefile set (.shp, .shx, .dbf) from an
>> > object. The object is drawn to the screen -- or any Graphics2D -- via
>> > its draw() method, so a good starting point would be an implementation
>> > of Graphics2D which writes to a shapefile instead of the screen.
>>
>> > Does anybody know of a good library to help with the creation of
>> > shapefiles in Java?
>>
>> Does ESRI provide anything in their APIs?
>
>As a matter of fact their MapObjects product does. But the project
>I'm doing this for doesn't use MapObjects, and it would be more
>complicated to convert my data to MapObjects features than to
>implement my own shapefile writer.
>
>Same goes for OpenMap.

check out the geotools api..

http://geotools.codehaus.org/Features

as a starting point, specifically the

org.geotools.feature and
org.geotools.data

contain most of what is needed.

Jim

Index ‹ java-programmer

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- 1
  - Question About Scaling Virtual World to Real World..Hello,
    i m developing one Java3D application, which takes real world
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- 2
  - here's my code. any help on the stateChanged method???
    /**
    *
    * @author kevin
    */
    /**
    * @(#)MyClock2.
    *
    *
    * @Kevin
    * @version 1.20 2007/4/20
    */
    import java.text.*;
    import java.text.ParseException;
    
    import java.awt.*;
    import java.awt.event.*;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.awt.Color;
    import java.awt.Font;
    import java.awt.GridLayout;
    
    import java.text.SimpleDateFormat;
    
    import java.util.*;
    import java.util.Calendar.*;
    import java.util.Date.*;
    
    import java.io.IOException;
    import javax.swing.*;
    import javax.swing.SpinnerDateModel;
    import javax.swing.event.*;
    import javax.swing.event.ChangeListener;
    import javax.swing.event.ChangeEvent;
    import javax.swing.JSpinner.*;
    
    abstract class BigFonts extends JComponent
    implements MouseMotionListener, ActionListener,
    ChangeListener
    {
    
    /*
    public void paintComponent(Graphics g){
    g.drawString(st, newx, newy);
    }
    */
    
    //make draggable
    public void MouseDragged(MouseEvent e){
    
    int newx =0;
    int newy = 0;
    newx=e.getX();
    newy=e.getY();
    repaint();
    }
    
    public static String doTime(String ts){
    
    //Calendar earliestdate, latestdate;
    String thetime;
    Calendar calendar = Calendar.getInstance();
    SimpleDateFormat tf = new SimpleDateFormat( "h:mm:ss a" ) ;
    thetime = tf.format(calendar.getTime());
    return thetime;
    }
    
    public static void addToBox(String thetime){
    
    // make text bigger for visually impaired friend
    
    String alarmTime;
    Font big = new Font("Serif", Font.BOLD, 40);
    JLabel msg = new JLabel("Time to go.");
    JButton thedisplay = new JButton(thetime);
    thedisplay.setFont(big);
    thedisplay.setSize(200, 200);
    
    // prepare alarm
    
    // put it all in a layout
    
    JFrame display = new JFrame("Set the Alarm, pleas.");
    display.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);;
    display.setSize(250, 100);
    display.setLayout(new GridLayout());
    display.setBackground(Color.blue);
    display.setFont(big);
    display.add(thedisplay);
    display.setVisible(true);
    }
    
    // spinner action
    
    public void stateChanged(ChangeEvent evt){
    
    JSpinner alarm = (JSpinner) (evt.getSource());
    alarm.setFocusable(true);
    alarm.setEnabled(true);
    alarm.setValue(alarm.getNextValue());
    
    }
    
    public static void setAlarm(){
    
    Font big = new Font("Serif", Font.BOLD, 40);
    JFrame display = new JFrame("Set the Alarm");
    Calendar calendar = Calendar.getInstance();
    // spinner model -- for setting alarm
    
    Date presentTime = calendar.getTime();
    Date earliestTime = calendar.getTime();
    Date latestTime = calendar.getTime();
    SpinnerDateModel model = new SpinnerDateModel(presentTime ,
    earliestTime,
    latestTime,
    Calendar.SECOND);
    
    JSpinner alarm = new JSpinner(model);
    alarm.setFont(big);
    alarm.setFocusable(true);
    alarm.setBackground(Color.blue);
    alarm.setEditor (new JSpinner.DateEditor(alarm,"hh:mm:ss aa"));
    alarm.setEnabled(true);
    alarm.setSize(200,200);
    display.setSize(300, 100);
    alarm.setVisible(true);
    display.add(alarm);
    alarm.setEnabled(true);
    display.setVisible(true);
    
    }
    
    public static void main(String[] args){
    
    int newx=125, newy=95; // coordinates of time
    boolean set;
    set = true;
    String st = " Starting ...";
    String theTime = " ";
    String theAlarm = " ";
    Thread t = new Thread();
    Calendar calendar = Calendar.getInstance();
    
    t.start();
    try{
    //setAlarm();
    if (set)
    setAlarm();
    else
    for (;;) { // forever
    addToBox(doTime(st));
    t.sleep(1000);
    } // forever
    
    }catch (Exception e){}
    
    //{ who cares?)
    
    }
    
    }
    
    --
    Sometimes I'm in a good mood.
    Sometimes I'm in a bad mood.
    When all my moods have cum to pass
    i hope they bury me upside down
    so the world can kiss me porcelain,
    white, Irish bottom.
- 3
  - Passing a method(reference) to an other method and calling the method.On Fri, 28 Mar 2008 02:58:17 -0700 (PDT), Erik <email***@***.com>
    wrote, quoted or indirectly quoted someone who said :
    
    >I have a staight forward question. Is is posible to pass a method as a
    >parameter and call the passed
    >method from within the other method?
    
    see http://mindprod.com/jgloss/callback.html
    --
    
    Roedy Green Canadian Mind Products
    The Java Glossary
    http://mindprod.com
- 4
  - tricky+frustrating: changing mouse handler while mouse pressed doesn't workHello,
    
    I have a quite tricky problem, on that I work on for 3 days now without
    success. It's frustrating. *sigh* :-(
    
    I am using Piccolo, a zoomable UI framework
    <http://www.cs.umd.edu/hcil/jazz/download/>, to create a 2D space on which
    I can place different kinds of nodes, e.g., pictures. However, my problem
    is more general and not Piccolo based.
    
    Every node on this 2D space has its own mouse event handler attached. With
    the mouse event handler you can click on a node and drag it to another
    place.
    
    Every node has internally its unique index ID. If two nodes intersect, then
    the one with a higher index is displayed above a node with lower index.
    
    Currently, you can drag a node anywhere, even underneath another node with
    higher index.
    
    WHAT I WANT:
    Whenever a node of higher index comes between the dragged node and the
    cursor, I want to release the original node and apply all mouse events to
    the higher placed node.
    
    If a user would do this manually, he/she would release the mouse button and
    click again. However, the user is not doing this, but the machine should;
    the user constantly just holds the mouse button pressed.
    
    This turns out to be very difficult to handle, because the user does *not*
    release the mouse button. The input handler of the node directly underneath
    the cursor (that *should* handle the mouse events then), does not get
    activated. :-(
    
    Any expert here who can see how to solve this problem?
    
    Here is the code. Don't worry about the Piccolo stuff. I think it is a
    general Java question about mouse events and robots (I use java.awt.Robot
    -- is this the right approach?). I have marked the problematic part:
    
    ******** <code> *******
    public void mouseDragged(PInputEvent aEvent) {
    // This tells other handlers that this event is now already handled now
    aEvent.setHandled(true);
    
    // Find the cursor position and the node position.
    Point2D cursorPos = aEvent.getPosition();
    PBounds nodePosition = aEvent.getPickedNode().getGlobalFullBounds();
    
    // Check if the cursor is within the node's bounds. This is
    // just for cases when the dragged node is slower than the cursor.
    if (nodePosition.contains(cursorPos.getX(), cursorPos.getY()) {
    
    // This retrieves the node directly underneath the cursor
    PNode nodeUnderneathCursor = aEvent.getPickedNode().getRoot()
    .getDefaultInputManager().getMouseOver()
    .getPickedNode();
    
    // If there is a node underneath the cursor + its not the background
    if (! nodeUnderneathCursor.equals(aEvent.getPickedNode())
    && ! nodeUnderneathCursor.getClass().equals(PCamera.class)) {
    
    // HERE IS THE PROBLEMATIC PART!! <<<<<<<<<<<<<<<<<<<<<<<<<<<<
    // Have in mind that there constantly comes a mouseDragged event
    // in from the user's pressed mouse button!
    try {
    Robot robot = new Robot();
    // this should release the mouse button for the original node
    robot.mouseRelease(InputEvent.BUTTON1_MASK);
    
    // Tell other handlers that this one doesn't want to handle anymore
    aEvent.setHandled(false);
    
    // this should perform a click; the position is right on the node
    // that is between the cursor and the original dragged node
    robot.mousePress(InputEvent.BUTTON1_MASK);
    } catch (AWTException e) {
    e.printStackTrace();
    }
    }
    }
    // Move the node to the new cursor position
    Dimension2D delta = aEvent.getDeltaRelativeTo(aEvent.getPickedNode());
    aEvent.getPickedNode().translate(delta.getWidth(), delta.getHeight());
    }
    ******* </code> *******
    
    Thanks a lot for any hint!
    Claus
- 5
  - JTable Editing not take effect until hit EnterHello dudes,
    
    I found out if you editing a JTable cell without hit
    the Enter or Tab key. Then the new cell value won't take
    effect. For example, a table cell value is "abc" and
    you change it to "xyz". Then when you read that table
    cell value, it still "abc". You MUST hit the Enter or
    Tab key, then you will get that table cell value as "xyz".
    
    How can I force that table cell value as "xyz" WITHOUT
    hit the Enter or Tab key?
    
    Thank Q very much in advance!
- 6
  - Overiding Static MethodsThis is a multi-part message in MIME format.
    
    Hi,
    
    When you override a non-static method, a call to that method from the super-class properly results in the sub-class version of that method being called. BUT, when you override a static method, it appears --to my frustration-- that a call to that method from the super-class results in the super-class version of the method being called!
    
    Here is an example of what I mean. My intention is for the following to print out "Success" but it always prints out "Failure." instead.
    It seems to ignore the fact that I have overrided method2( ) from ClassA with method2( ) from ClassB.
    
    class ClassA
    { static void method1 () { method2(); }
    static void method2 () { System.out.println("Failure."); }
    }
    
    class ClassB extends ClassA
    { public static void main (String[] args) { method1(); }
    static void method2 () { System.out.println("Success."); }
    }
    
    I can get around the this problem by removing the static modifier, creating a third class, and instantiating a ClassB object. Like below. But I'd rather not have to create a third class, and instantiate an object if there is a way to to keep the code smaller,simpler,easier. Is there a way to fix the code above so that it prints "Success" instead? It just seems like there ought to be!
    
    class ClassA
    { void method1 () { method2(); }
    void method2 () { System.out.println("Failure."); }
    }
    
    class ClassB extends ClassA
    { void method2 () { System.out.println("Success."); }
    }
    
    class Start
    { public static void main (String[] args)
    { ClassB b = new ClassB();
    b.Method1();
    }
    }
    
    -Ken
    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
    <HTML><HEAD>
    <META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
    <META content="MSHTML 6.00.2800.1400" name=GENERATOR>
    <STYLE></STYLE>
    </HEAD>
    <BODY>
    <DIV><FONT face=Arial size=2>Hi, </FONT></DIV>
    <DIV><FONT face=Arial size=2></FONT> </DIV>
    <DIV><FONT face=Arial size=2>When you override a non-static method, a call to
    that method <EM>from the super-class </EM>properly results in the sub-class
    version of that method being called. BUT, when you override a static
    method, it appears --to my frustration-- that a call to that
    method <EM>from the super-class </EM>results in the super-class version of
    the method being called! </FONT></DIV>
    <DIV><FONT face=Arial size=2></FONT> </DIV>
    <DIV><FONT face=Arial size=2>Here is an example of what I mean. <STRONG>My
    intention</STRONG> is for the following to print out "Success" but it
    always prints out "Failure." instead. </FONT></DIV>
    <DIV><FONT face=Arial size=2>It seems to ignore the fact that I have
    overrided method2( ) from ClassA with method2( ) from ClassB.</FONT></DIV>
    <DIV><FONT face=Arial size=2></FONT><FONT face=Arial size=2></FONT> </DIV>
    <DIV><FONT face=Courier size=2>class ClassA <BR>{   static void
    method1
    ()                  {   method2();                      }<BR>
    static void method2
    ()                  {   System.out.println("Failure.");
    }<BR>}</FONT></DIV>
    <DIV><FONT face=Courier size=2></FONT> </DIV>
    <DIV><FONT face=Courier size=2>class ClassB extends ClassA </FONT></DIV>
    <DIV><FONT face=Courier size=2>{   public static void main (String[]
    args) {
    method1();                      }<BR>    static
    void method2
    ()
    {   System.out.println("Success."); }<BR>}<BR></DIV></FONT>
    <DIV><FONT face=Arial size=2></FONT> </DIV>
    <DIV><FONT face=Arial size=2>I can get around the this problem by removing
    the static modifier,  creating a third class, and instantiating a
    ClassB object. Like below. But I'd rather not have to create a third
    class, and instantiate an object if there is a way to to keep the code
    smaller,simpler,easier. Is there a way to fix the code above so that it
    prints "Success" instead? It just seems like there ought to
    be!</FONT></DIV>
    <DIV><FONT face=Arial size=2></FONT> </DIV>
    <DIV><FONT face=Arial size=2></FONT> </DIV>
    <DIV><FONT face=Courier size=2>class ClassA </FONT></DIV>
    <DIV><FONT face=Courier size=2>{   void method1 ()
         {
    method2();
    }<BR>    void method2 ()      {
    System.out.println("Failure."); }<BR>}</FONT></DIV>
    <DIV><FONT face=Courier></FONT> </DIV>
    <DIV><FONT face=Courier size=2>class ClassB extends ClassA </FONT></DIV>
    <DIV><FONT face=Courier size=2>{   void method2
    ()      {
    System.out.println("Success."); }<BR>}</FONT></DIV>
    <DIV><FONT face=Courier></FONT> </DIV>
    <DIV><FONT face=Arial size=2><FONT face=Courier>class Start </FONT></FONT></DIV>
    <DIV><FONT face=Arial size=2><FONT face=Courier>{   public static void
    main (String[] args)  </FONT></FONT></DIV>
    <DIV><FONT face=Arial size=2><FONT face=Courier>    {
    ClassB b = new ClassB();<BR>
    b.Method1();<BR>    }</FONT><BR>}</FONT></DIV>
    <DIV><FONT face=Arial size=2></FONT> </DIV>
    <DIV><FONT face=Arial size=2>-Ken</FONT></DIV>
    <DIV><FONT face=Arial size=2></FONT> </DIV>
    <DIV><FONT face=Arial size=2></FONT> </DIV></BODY></HTML>
- 7
  - Usage of 'javap' to decompile into useful codeThe following is the source code contained within myClass.java
    -----------------
    package main.sub;
    
    public class myClass
    {
    public static final boolean ISDEBUG = true;
    }
    -----------------
    
    If I use javap to decompile from the corresponding .class, I get only this:
    
    user@machine: javap main.sub.myClass
    Compiled from myClass.java
    public class main.sub.myClass extends java.lang.Object {
    public static final boolean ISDEBUG;
    public main.sub.myClass();
    }
    
    How do I have to use 'javap' to get the exact code, as shown above?
- 8
  - DefaultTableModel Column IdentifiersWhy is it that I can set a column identifier as an Object with:
    
    model.setColumnIdentifiers(new Object[]{myObject});
    
    Yet if I then call:
    
    Object x = new JTable(model).getColumnModel().getColumn(0).getIdentifier();
    
    x is not myObject but myObject.toString()
    
    Surely there's something screwy going on here?
    In fact, is there any way I can get reference to myObject without
    subclassing DefaultTableModel?
    
    Any help appreciated!
    
    Ant
    
    Using Using jdk1.3.1_02, code snippet below:
    
    **************************************
    Object myObject = new Double(4.2);
    DefaultTableModel model = new DefaultTableModel();
    model.setColumnIdentifiers(new Object[]{myObject});
    Object x = new JTable(model).getColumnModel().getColumn(0).getIdentifier();
    System.out.println("myObject is a "+myObject.getClass().getName());
    System.out.println("x is a "+x.getClass().getName());
    **************************************
- 9
  - gridbaglayout weightsIf I have this layout with 3 columns:
    
    [comp1 weight=0][comp2 weight=3][comp3 weight=2]
    [comp4 weight=1 gridwidth=3 ]
    [comp5 weight=0.75 gridwidth=2 ][comp6 weight=4]
    
    What would be the effective weight of each column?
    Docs say the max in each so would that be:
    
    col1 - 1
    col2 - 3
    col3 - 4
    
    and what would be the effect of the weights on comp4 and comp5 when resizing
    as they span cols with different weights?
    
    Cheers, Richard.
- 10
  - Java 5 threads in linuxHi,
    
    I am using the following java version in Linux
    
    java version "1.5.0_06"
    Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
    Java HotSpot(TM) Server VM (build 1.5.0_06-b05, mixed mode)
    
    Threads are created using the source code:
    private static ExecutorService thPool =
    Executors.newFixedThreadPool(5);
    
    My question is how threads are created in linux using the mentioned
    runtime.
    1. Does the code line above create 5 linux native threads (process)?
    2. Does it create java threads? Don't know if java and native threads
    are same.
    3. If answer of the question 1 is "NO" then does one native linux
    threads for java runtime do all the concurrent execution?
    
    Please explain. Any documents on java threads in Linux for java 5?
    
    Thanks in advance
    
    Sunny
- 11
  - from text file to InputSource (another how to get there from here question)I need to pick up a file sitting in WEB-INF/classes, which I usually do like
    this:
    ClassLoader cl = MyClassName.class.getClassLoader();
    InputStream rules = cl.getResourceAsStream( XML_RULES );
    
    But an InputStream won't do, the createDigester method takes either
    org.xml.sax.InputSource or java.net.URL .
    
    Initially, I had this:
    ClassLoader cl = MyClassName.class.getClassLoader();
    InputStream rules = cl.getResourceAsStream( XML_RULES );
    Digester digester = DigesterLoader.createDigester( new InputSource(
    rules) );
    
    And then I got it down to:
    ClassLoader cl = MyClassName.class.getClassLoader();
    Digester digester = DigesterLoader.createDigester( cl.getResource(
    XML_RULES ) );
    (ClassLoader.getResource returns a URL.)
    
    There's probably a more direct path, I just don't see it.
    
    What methods other than ClassLoader.getResource and getResourceAsStream can
    find things on the classpath? InputSource has a constructor that takes a
    'system identifier' but I haven't been able to figure out exactly what that
    is.
    
    Thanks once again!
    --
    Wendy
- 12
  - inputting local filepathI am attempting to input a database location from a txt file located
    within the build folder. However, I am having a bitchin time getting
    it to work with relative file location. So far, I can only get
    absolute file names to work, this is useless. Any help would be
    appreciated. My code can be found below....
    
    import java.sql.*;
    import javax.swing.DefaultListModel;
    import java.io.*;
    
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    import java.io.*;
    
    public class DataConnection {
    
    public DataConnection(){
    DataInputStream input;
    String name = "";
    File dBLocation = new File("C:\\Documents and
    Settings\\Owner.JustinLaptop\\Desktop\\USC
    Programs\\ConsultRequest\\build\\classes\\consultrequest\\testing\\dBURL.txt");
    
    dBLocation = new File("..consultrequest\\testing\\dBURL.txt");
    System.out.println(dBLocation.getParentFile());
    
    System.out.println(dBLocation.exists());
    try { // try to create an object representing the user-selected file
    input = new DataInputStream( new FileInputStream(dBLocation) );
    
    try { // try to read the file and create a string consisting of
    its contents
    char ch;
    do { // read data from the file until end of file is reached
    name = "";
    ch = input.readChar();
    while ( ch != ';' ) {
    name = name + ch;
    ch = input.readChar();
    }
    }
    
    while ( true );
    } catch ( Exception ex ) {
    }
    
    try { // try to close the file
    input.close();
    } catch ( Exception ex ) {
    }
    
    } catch ( Exception ex ) {
    System.out.println("Database location cannot be found");
    }
    
    System.out.println(name);
    }
    
    public static void main(String[] args){
    
    DataConnection data = new DataConnection();
    }
    }
- 13
  - Struts Eclipse JSTLHi,
    
    I am an eclipse newbie. I need a free ide to develop struts with jstl.
    I was wondering if anyone knew how to setup eclipse 3.2.1 with struts.
    I was wonderng if any one could help me out. I cant seem to find any
    good non commercial plugins for eclipse to do this
    
    Thanks
    :)
- 14
  - javax.print questions - how useful is it??I'm working with the JDK 1.4.1_03-b02 on XP. I'm writing an
    application that needs to dynamically retrieve data, format it and
    sent it to a HP laser printer. I started off using the javax.print
    service but I'm finding that i'm limited in what I can actually do.
    It appears that the only DocFlavors supported by these printers are
    print images, application/octet mime types and the awt interface
    Printable and Pageable representation types.
    
    As I am only printing text I chose the application/octet, InputStream
    combination but this appears not to allow the OrientationRequested
    attribute - I need to print landscape, not portrait. Has anybody got
    around this?
    
    I also need to have some formatting of the text such as bold text,
    larger font size in some places etc. Does anybody know of any way of
    specifying control charactors in the InputStream that will allow this?
    
    Do any of the URL DocFlavors actually interpret the contents of a html
    file and print text as it would be displayed? I think the answer is
    no, but just sanity checking?
    
    It looks to me as if I'm going to have to place my formatted text in
    to a swing or awt component and print from there. This seems like
    overkill to me - am I missing something?
    
    Any help appreciated,
    Regards,
    Aoife
- 15
  - struts radio indexed fieldGreetings to all -
    
    I'm having some difficulty to render indexed radio input fields
    correctly. The problem is that it's a "double" indexed example. The
    jsp operates on the collection of the Question instances. And each
    question has a list of pre-defined answers to choose from. The idea is
    to list all of the questions and then collect the answers chosen. The
    "list" and "text" types are working (generating both
    name="questions[x].answer", where x is the index of the question) but
    radio does not.
    
    If indexed="true" is specified, then each pre-defined radio answer has
    a name="questions[x].answer" WHERE x is the index of the PRE-DEFINED
    ANSWER from the predefinedAnswers iterator (not from the questions
    iterator).
    
    If indexed attribute is not specified, then the input field name is
    rendered just as name="answer".
    
    There should be a way to make it work. Is nested:radio going to help
    in any way ? Any suggestions are very appreciated.
    Thanks
    Pavel
    
    Here is the relevant portion of the jsp:
    
    <logic:iterate id="questions" property="questions"
    name="questionSetForm">
    
    <logic:equal name="questions" property="type" value="list">
    <div>It's a list</div>
    <html:select name="questions" property="answer" indexed="true">
    <html:optionsCollection name="questions"
    property="predefinedAnswers" value="id" label="label"/>
    </html:select>
    </logic:equal>
    
    <logic:equal name="questions" property="type" value="text">
    <div>It's a text</div>
    <html:text name="questions" property="answer" indexed="true" />
    </logic:equal>
    
    <logic:equal name="questions" property="type" value="radio">
    <div>It's a radio choice</div>
    <logic:iterate id="predefinedAnswer" property="predefinedAnswers"
    name="questions">
    <html:radio name="questions" property="answer" value="id"
    idName="predefinedAnswer">
    <bean:write name="predefinedAnswer" property="label" />
    </html:radio>
    </logic:iterate>
    </logic:equal>
    
    </logic:iterate>
    
    The questionSetForm class defines only one property that hold a
    collection of Question instances:
    
    public List getQuestions() {
    return questions;
    }
    
    public void setQuestions(List questions) {
    this.questions = questions;
    }
    
    The Question class defines the following relevant properties (along
    with corresponding get/set methods):
    private Integer id = null;
    private Integer questionSetId = null;
    private String type = null;
    //Holds the collection of the PredefinedAnswer instances
    private List predefinedAnswers = null;
    private String label = null;
    private String answer = null;
    
    The PredefinedAnswer class defines the id and label properties used to
    render the list of choices.