java-programmer >>Java regex imposture re: Perl regex compatibility

Java regex imposture re: Perl regex compatibility

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- 2
  - Java RPCHi All,
    
    We have a set of application that communicates with embeded devices
    that runs linux. Now we decide to use xml-rpc to send commands to the
    devices with Apache's xmlrpc (or any other). We only need to generate,
    and parse the structured xml string that contains the method name and
    parameters. In other words we dont want to use a rpc server.
    My question is how can I obtain the xml string of RPC command by only
    suplying the method name and a vector that contains the parameters.
    
    ps. In addition to primitive data types, parameters may contain
    struct, array and etc.
    
    Thanks in advance for your answer..
- 2
  - JTK - Care to comment on this?Java vs C and C++
    http://www.idiom.com/~zilla/Computer/javaCbenchmark.html
    
    l8r, Mike N. Christoff
- 2
  - java/62837: linux-sun-jdk14 executables hang with COMPAT_LINUX in the the kernel.Synopsis: linux-sun-jdk14 executables hang with COMPAT_LINUX in the the kernel.
    
    State-Changed-From-To: open->feedback
    State-Changed-By: linimon
    State-Changed-When: Fri Mar 31 08:51:09 UTC 2006
    State-Changed-Why:
    Submitter: is this still a problem?
    
    Responsible-Changed-From-To: phantom->freebsd-java
    Responsible-Changed-By: linimon
    Responsible-Changed-When: Fri Mar 31 08:51:09 UTC 2006
    Responsible-Changed-Why:
    Reassign from phantom since he has been inactive for more than one year.
    
    Hat: gnats-admin
    
    http://www.freebsd.org/cgi/query-pr.cgi?pr=62837
- 5
  - Layout problem driving me insane - panels, resizing, etcIchBin wrote:
    > email***@***.com wrote:
    >>> Get NetBeans. (Get the latest one, 5.5) You don't need any plugins,
    >>> everything is there for you already. Go through the tutorial below,
    >>> it'll take about 30 minutes. If your eyes don't pop out of your head
    >>> like Rodger Rabbit, then you can safely ignore it.
    >>>
    >>> http://www.netbeans.org/kb/50/quickstart-gui.html
    >>
    >> 60 MB - yikes. I'll download it tonight and play with it a little
    >> bit... and also try all the other suggestions. I'll try and post my
    >> conclusions tomorrow.
    >>
    
    [snip]
    
    Just looked at the code again. It's ok but wanted to slim it down one
    more time..
    
    import java.awt.Dimension;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    
    import javax.swing.BorderFactory;
    import javax.swing.JButton;
    import javax.swing.JComponent;
    import javax.swing.JFrame;
    import javax.swing.JPanel;
    import javax.swing.JScrollPane;
    import javax.swing.JTable;
    import javax.swing.JTextArea;
    import javax.swing.ListSelectionModel;
    import javax.swing.SwingUtilities;
    
    import com.jgoodies.forms.builder.DefaultFormBuilder;
    import com.jgoodies.forms.debug.FormDebugPanel;
    import com.jgoodies.forms.debug.FormDebugUtils;
    import com.jgoodies.forms.factories.ButtonBarFactory;
    import com.jgoodies.forms.layout.FormLayout;
    
    public class LayoutProblem implements ActionListener
    {
    public static void main(String[] args)
    {
    SwingUtilities.invokeLater(new Runnable()
    {
    public void run()
    {
    new LayoutProblem();
    }
    });
    }
    public LayoutProblem()
    {
    jFrame.setDefaultCloseOperation(jFrame.EXIT_ON_CLOSE);
    jFrame.add(buildMainPanel());
    jFrame.setPreferredSize(new Dimension(475,600));
    jFrame.pack();
    jFrame.setVisible(true);
    }
    private JPanel buildMainPanel()
    {
    FormLayout layout = new FormLayout (
    /* Columns */ "default:grow",
    /* Rows */ "pref, 12dlu, fill:0:grow(0.50), 20dlu,
    fill:0:grow(0.50)"
    );
    DefaultFormBuilder builder = DEBUGMODE
    ? new DefaultFormBuilder(layout,new FormDebugPanel())
    : new DefaultFormBuilder(layout);
    
    builder.setDefaultDialogBorder();
    builder.nextLine(2);
    builder.append(buildControl(jTable));
    builder.append(buildButtonBar());
    builder.append(buildControl(jTextArea));
    
    if (DEBUGMODE)
    {
    FormDebugUtils.dumpAll(builder.getPanel());
    }
    return builder.getPanel();
    }
    private JComponent buildButtonBar()
    {
    JPanel jPanel = new JPanel();
    jPanel = ButtonBarFactory.buildCenteredBar(
    buildControl(BUTTON1),
    buildControl(BUTTON2),
    buildControl(BUTTON3),
    buildControl(TEXT_EXIT));
    jPanel.setBorder(BorderFactory.createRaisedBevelBorder());
    return jPanel;
    }
    private JButton buildControl(String labelText)
    {
    jButton = new JButton(labelText);
    jButton.addActionListener(this);
    return jButton;
    }
    private JComponent buildControl(JTable jTable)
    {
    jTable = new JTable(dataValues, columnNames);
    JScrollPane scrollPane = new JScrollPane(jTable);
    jTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    return scrollPane;
    }
    private JComponent buildControl(JTextArea jTextArea)
    {
    jTextArea = new JTextArea(logAreaHdr);
    JScrollPane scrollPane = new JScrollPane(jTextArea );
    return scrollPane;
    }
    public void actionPerformed(ActionEvent e)
    {
    final String method = "jBotton_actionPerformed(ActionEvent " +
    e + "): ";
    if (DEBUGMODE)
    {
    System.out.println(DEBUGHEATER + method);
    }
    
    if (BUTTON1.equals(e.getActionCommand()))
    {
    }
    else if (BUTTON2.equals(e.getActionCommand()))
    {
    }
    else if (BUTTON3.equals(e.getActionCommand()))
    {
    }
    else if (TEXT_EXIT.equals(e.getActionCommand()))
    {
    System.exit(0);
    }
    }
    
    private static final String PROGRAM = (((new
    Throwable()).getStackTrace())[0].getClassName())+".";
    private static final String DEBUGHEATER = "( DEBUG ) " + PROGRAM;
    private static final boolean DEBUGMODE = false;
    
    private JFrame jFrame = new JFrame("JGoodies
    Forms Layout Demo");
    private JTable jTable;
    private JTextArea jTextArea;
    private JButton jButton;
    
    private final String BUTTON1 = "Button 1";
    private final String BUTTON2 = "Button 2";
    private final String BUTTON3 = "Button 3";
    private final String TEXT_EXIT = "EXIT";
    private final String logAreaHdr =
    "---------------------------\n---------------------------\n---------------------------\n";
    
    private final String columnNames[] = {"Column 1", "Column
    2", "Column 3"};
    private String dataValues[][] = {
    {"0aa", "bbb", "ccc"},
    {"0dd", "eee", "fff"},
    {"0gg", "hhh", "iii"},
    {"1aa", "bbb", "ccc"},
    {"1dd", "eee", "fff"},
    {"1gg", "hhh", "iii"},
    {"2aa", "bbb", "ccc"},
    {"2dd", "eee", "fff"},
    {"2gg", "hhh", "iii"},
    {"3aa", "bbb", "ccc"},
    {"3dd", "eee", "fff"},
    {"3gg", "hhh", "iii"},
    {"4aa", "bbb", "ccc"},
    {"4dd", "eee", "fff"},
    {"4gg", "hhh", "iii"},
    {"5aa", "bbb", "ccc"},
    {"5dd", "eee", "fff"},
    {"5gg", "hhh", "iii"},
    {"6aa", "bbb", "ccc"},
    {"6dd", "eee", "fff"},
    {"6gg", "hhh", "iii"},
    {"7aa", "bbb", "ccc"},
    {"7dd", "eee", "fff"},
    {"7gg", "hhh", "iii"},
    {"8aa", "bbb", "ccc"},
    {"8dd", "eee", "fff"},
    {"8gg", "hhh", "iii"},
    {"9aa", "bbb", "ccc"},
    {"9dd", "eee", "fff"},
    {"9gg", "hhh", "iii"},
    {"aaa", "bbb", "ccc"},
    {"ddd", "eee", "fff"},
    {"ggg", "hhh", "iii"},};
    }
    
    --
    
    Thanks in Advance...
    IchBin, Pocono Lake, Pa, USA
    http://weconsultants.servebeer.com/JHackerAppManager
    __________________________________________________________________________
    
    'If there is one, Knowledge is the "Fountain of Youth"'
    -William E. Taylor, Regular Guy (1952-)
- 5
  - How can I reconstruct a image from a buffer so that I can draw that in Java Swing component?I have a byte buffer, let's say buf.
    
    buf[20000] is now containing an JPEG image file's bytes, which has
    about 10000 bytes
    
    How can I draw that out in Java swing components like ImageIcon or
    Jlabel??
    
    Thank you.
    
    Can anyone provide me some sample code??
    
    Thank you/.
- 5
  - Process managementI am looking some packages for:
    - monitoring a machine (total/free memory, CPU usage, keyboard/mouse
    activity)
    - managing processes (start/ssupend/resume/change priority) of processes.
    
    I need this working at least on Windows/Linux ;-)
    
    So far I was not able to find something doing this.
    
    Thanks for your help.
    Guillaume
- 5
  - Setting Appender's fields in Apache's Log4JHi,
    
    In the following code snippet (which is written to create a
    FileAppender & make log4J log to that file):
    
    import org.apache.log4j.*;
    
    class sample
    {
    ....
    HTMLLayout layout = new HTMLLayout();
    layout.TITLE_OPTION = "DataSE Log";
    String logFileName = "Log.txt";
    Appender appender = new FileAppender(layout, logFileName, true);
    appender.immediateFlush = false;
    appender.bufferedIO = true;
    appender.bufferSize = 64;
    Logger logger = Logger.getLogger();
    logger.addAppender(appender);
    .....
    }
    
    the above snippet is not inside any method. Its directly within the
    class. In the above snippet, I am encountering 2 types of errors:
    
    1. Am using the fields of the classes FileAppender & layout. The usage
    seems to be wrong, because am getting the error "'synatx error on
    token(s); misplaced construct(s)" & similar errors.
    
    2. how to specify the bufferSize? Just as '64' or '64K'?
    
    Thanks.
- 7
  - Java UML tutorialsThere's a good tutorial on UML with corresponding Java code at
    http://www.parlezuml.co.uk/tutorials/java/class/index.htm
    
    So far there's only one on class diagrams, but there's quite a few
    much more advanced UML tutorials aimed at C# developers that this one
    seems to be a "port" of, so expect more tutorials soon.
    
    designman
- 9
  - JDBC: get all odbc datasource nameHi,
    I want write a java code for get all odbc datasource name from my operation
    system.
    
    Is it possible?
    
    Thanks you,
    Carlo
- 12
  - Code genration for Spring/Ibatis/Hibernatehttp://rapiddeploy.blogspot.com
- 12
  - Lomboz: problems running JBoss
    > The result: Now I can start JBoss within Lomboz :)
    > But calling my web results in an
    > "Error running javac.exe compiler"
    > Adding the variable "JAVA_HOME" did not help :(
    
    Now I found out, that it works, when I put the bin dir
    of javac.exe to the Windows system PATH before running
    Eclipse. I don't like that. Isn't there another way?
    
    Marcus
- 13
  - checking for org.omg.CORBA.OBJECT_NOT_EXISTHi,
    
    I'm writing a java CORBA client, using the Visibroker ORB. Sometimes
    when I call methods on the remote object references I get the following
    exception
    
    org.omg.CORBA.OBJECT_NOT_EXIST: vmcid: OMG minor code: 0 completed:
    No
    
    Is there some way that I can check beforehand whether this exception
    will be thrown, i.e. whether the remote object still exists? I thought
    that I could do it like this:
    
    if (myRef._non_existent()) {
    
    // get a new myRef
    }
    
    myRef.doRemoteMethod();
    
    But I've found that _non_existent() throws exceptions. Is there a
    better way to check for the state that causes an OBJECT_NOT_EXIST
    exception?
    
    Regards,
    Dan
- 13
  - [OT]httpservletrequest parameters in netscapesookean wrote:
    > Some more info...
    >
    > Here's some snippet for the list box:
    > <select name="mylistbox" id="select2" onchange="setLang()">
    >
    > And here's a simplified version of my setLang()
    > function setLang()
    > {
    > document.location.href="www.myserver.com?page=mypage&page2="+document.listbox[listbox.selectedIndex].value;
    > }
    
    Two points:
    
    1) This question is off-topic for this (non-existent) group.
    2) Does the version of Netscape you are using claim to be XHTML
    compliant? Are you identifying your document as as XHTML document and
    not simply an HTML document?
    
    Ray
- 13
  - Mystery of the Shrinking JScrollPaneI've got a slight mystery that I can't fathom, and was wondering if someone
    could help me understand what I've done wrong.
    
    I'm trying to create a simple interface within a defined width and height.
    It consists of a top half, and a bottom half.
    
    The top half is a sideways-scrolling panel containing a bunch of smaller
    panels side-by-side, in a GridLayout. This can expand to fit the width of
    the overall UI, but must never take more height than it actually needs to
    show the smaller panels in full.
    
    The bottom half is simply a panel, which should absorb all extra height and
    width.
    
    If I add sufficient images to NOT exceed the width of the overall UI,
    everything works as expected; the JScrollPane expands to fit the images'
    height into its viewport, and the filler panel below takes up the slack.
    
    But if I add another small panel, enough to exceed the width of the overall
    UI, it goes wrong; the JScrollPane shrinks to practically nothing. I have
    set the preferred height of the small panels and of the panel they sit in
    (which is inside the scroll pane), so it's not as if it shouldn't be able to
    figure out how tall it should be; after all, it figured it out when they
    didn't exceed the width.
    
    I just can't understand why it should suddenly shrink.
    
    Here's an applet that will demonstrate the problem:
    
    First, the HTML file to run it:
    
    <HTML>
    <HEAD>
    <TITLE>TestShrinkingScrollPane</TITLE>
    </HEAD>
    <BODY>
    <APPLET code="JTestShrinkingScrollPaneApplet.class" width="840"
    height="640"></APPLET>
    </BODY>
    </HTML>
    
    Now the single java source file to compile (compiling using 1.4.1_03),
    JTestShrinkingScrollPaneApplet.java :
    
    import javax.swing.JApplet;
    import javax.swing.JPanel;
    import javax.swing.JScrollPane;
    
    import java.awt.Color;
    import java.awt.Dimension;
    import java.awt.GridBagConstraints;
    import java.awt.GridBagLayout;
    import java.awt.GridLayout;
    import java.awt.Insets;
    
    /**
    *
    */
    
    /**
    * @author Jason
    *
    */
    public class JTestShrinkingScrollPaneApplet extends JApplet
    {
    /**
    *
    */
    private static final long serialVersionUID = 1L;
    
    public void init()
    {
    final int NUM_SMALL_PANELS = 5 ;
    
    // Add a panel with GridBagLayout to the content pane as our root
    component.
    JPanel backPanel = new JPanel();
    backPanel.setBackground(Color.RED);
    backPanel.setLayout(new GridBagLayout() );
    getContentPane().add(backPanel);
    
    // Create our panel that will scroll sideways, and its contents.
    JPanel scrollablePanel = new JPanel();
    scrollablePanel.setBackground(Color.BLUE);
    scrollablePanel.setLayout(new GridLayout(1, NUM_SMALL_PANELS, 0, 0) );
    // No gaps between cells. Unlike FlowLayout(), this forces it on to one
    row.
    for (int panelIndex = 0 ; panelIndex < NUM_SMALL_PANELS ; panelIndex++)
    {
    JPanel smallPanel = new JPanel();
    smallPanel.setBackground(Color.YELLOW);
    smallPanel.setPreferredSize(new Dimension(160, 110) );
    scrollablePanel.add(smallPanel);
    }
    // With no gaps between cells, the overall size needed is obvious:
    scrollablePanel.setPreferredSize(new Dimension(160 * NUM_SMALL_PANELS,
    110) );
    
    // Create the bottom panel, that will absorb the extra height available.
    JPanel fillerPanel = new JPanel();
    fillerPanel.setBackground(Color.GREEN);
    
    // Now create the grid bag.
    GridBagConstraints constraints = new GridBagConstraints();
    constraints.anchor = GridBagConstraints.CENTER ;
    constraints.gridheight = 1 ;
    constraints.gridwidth = 1 ;
    constraints.gridx = 0 ;
    constraints.insets = new Insets(0, 0, 0, 0);
    constraints.ipadx = 0 ;
    constraints.ipady = 0 ;
    constraints.weightx = 1.0 ;
    
    // The wide, scrollable panel - it can absorb the width, but must not
    // absorb any more height THAN IT NEEDS!
    constraints.fill = GridBagConstraints.HORIZONTAL ;
    constraints.gridy = 0 ;
    constraints.weighty = 0.0 ;
    backPanel.add(new JScrollPane(scrollablePanel), constraints);
    
    // The other panel - it can absorb the width AND the height.
    constraints.fill = GridBagConstraints.BOTH ;
    constraints.gridy = 1 ;
    constraints.weighty = 1.0 ;
    backPanel.add(fillerPanel, constraints);
    }
    }
    
    If you compile and display it as it stands, you can see the JScrollPane is
    quite rightly displaying the yellow small panels in full height.
    
    If you now change NUM_SMALL_PANELS to 6, which goes beyond the width, and
    then re-display it, you'll see the scroll pane collapses.
    
    Any ideas as to why this happens? I've tried setting the viewport preferred
    size but it doesn't make any difference. The best I can do is manually set
    the scroll pane's size to the needed height + a scroll bar's preferred
    height but that is neither elegant nor perfect - I want to know why it goes
    wrong!
    
    Any help on the why would be appreciated.
- 13
  - Torque and WebsphereWe are implenting a J2EE project where WebSphere is handling
    connection pooling for the application calls to a database. We have a
    JDBC Resource configured which tested successfully. We also have the
    application successfully connecting to the database which is confirmed
    by the following error message.
    
    rethrown as org.apache.torque.TorqueException: [IBM][CLI Driver][DB2]
    SQL0204N "TSTUSER.PERMISSION" is an undefined name.
    
    The problem is apparent, TSTUSER does not own a table called
    PERMISSION and in fact this table is owned by the user TELUSER and our
    intention is for TSTUSER to execute DML against it. We have not been
    able to configure the schema.xml file nor the build.properties to
    instruct Torque to produce SQL that fully qualifies the object name
    with the appropriate schema owner. Any advice you might offer will be
    appreciated.
    
    Best regards

Author

Message

a_c_Attlee

Posted: 2005-5-6 3:46:00

Top

java-programmer, Java regex imposture re: Perl regex compatibility // java has claimed to have added Perl style regular expressions ,
however
// writing a regular expression containing a variable is ugly in java.
// in Perl: $rec =~ s/$delimiter//g is easy to write and to read.
// in java: if delimiter may hold say "||" or "!" isntead of [a-z]
text,
// you have to quote it as below with preceding \\Q (not just \Q ) and
// trailing \\E. ugly and difficult to code!

rec = rec.replaceAll("\\Q" + delimiter + "\\E" ,"");

So even though java has perl style regex in principle, in practice,
in java they seem nearly unusable!

-A.C. Attlee

Betty

Posted: 2005-5-6 6:00:00

Top

java-programmer >> Java regex imposture re: Perl regex compatibility
<email***@***.com> wrote in message
news:email***@***.com...
> // java has claimed to have added Perl style regular expressions ,
> however
> // writing a regular expression containing a variable is ugly in java.
> // in Perl: $rec =~ s/$delimiter//g is easy to write and to read.
> // in java: if delimiter may hold say "||" or "!" isntead of [a-z]
> text,
> // you have to quote it as below with preceding \\Q (not just \Q ) and
> // trailing \\E. ugly and difficult to code!
>
> rec = rec.replaceAll("\\Q" + delimiter + "\\E" ,"");
>
> So even though java has perl style regex in principle, in practice,
> in java they seem nearly unusable!
>
> -A.C. Attlee
sissy

gimme_this_gimme_that

Posted: 2005-5-6 8:16:00

Top

java-programmer >> Java regex imposture re: Perl regex compatibility If you want full Perl5 regex capability, Perl style, use the Apache ORO
package.

Index ‹ java-programmer

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- 1
  - Shuffled Poker DeckHi all,
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    c.weightx = 1.0; //request any extra vertical space
    //c.anchor = GridBagConstraints.EAST;//third row
    pane.add(jtf, c);
    
    jtf = new JTextField();
    c.gridx = 3; //aligned with button 2
    c.gridwidth = 1; //2 columns wide
    c.gridy = i;
    c.weightx = 1.0; //request any extra vertical space
    //c.anchor = GridBagConstraints.EAST;//third row
    pane.add(jtf, c);
    
    label = new JLabel("");
    c.gridx = 4; //aligned with button 2
    c.gridwidth = 2; //2 columns wide
    c.gridy = i;
    //c.insets = new Insets(0,0,0,10);
    c.weightx = 1.0; //request any extra vertical space
    //c.anchor = GridBagConstraints.EAST;//third row
    pane.add(label, c);
    }
    
    }
    
    private static void createAndShowGUI() {
    JFrame frame = new JFrame("GridBagLayoutDemo");
    JFrame.setDefaultLookAndFeelDecorated(true);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JPanel panel = new JPanel();
    addComponentsToPane(panel);
    frame.getContentPane().add( panel );
    
    //Display the window.
    frame.pack();
    frame.setVisible(true);
    }
    
    public static void main(String[] args) {
    javax.swing.SwingUtilities.invokeLater(new Runnable() {
    public void run() {
    createAndShowGUI();
    }
    });
    }
    }
- 8
  - basics of ANThi, i have downloaded and started reading the ant tutorial.
    
    i am confused becuase some of the concepts , the tutorial (jakarta )
    is not making clear.
    
    my objective is to compile and run a java program.
    
    my questions are as follows
    
    it is called in order to compile and run you need a "build.xml" file .
    where is that file ?
    
    QUESTION 1: is it within ant distribution OR i have to make a
    build.xml file myself?
    
    The tutorial does not say anything about it. it just starts straight
    forward with a demo "build.xml" file.
    
    where do i put this "build.xml" file ?
    
    QUESTION 2 :
    
    i have a java code here.
    
    >md src
    
    package oata;
    
    public class HelloWorld {
    public static void main(String[] args) {
    System.out.println("Hello World");
    }
    }
    
    location of this code is "src/oata/HelloWorld.java"
    
    Now tell, where do i put "build.xml" file ?
- 9
  - How to open dialup connection in Java?Hi everyone,
    Who know, how to open dialup connection from Java? (I found only one
    way - to run another program (*.bat file), but it's not good idea). Any
    another suggestions?
    Haim.
- 10
  - HAVI packages, where?Hi everyone, I want to download HAVI API packages for java but i don't
    know where can i download its. Thank you
- 11
  - polymorphic voodoo?Ok, here is what I am trying to decipher. I have the following code
    
    private void someMethod() {
    ArrayList list1 = null;
    LinkedList list2 = null;
    
    cleverFunction(list1,list2);
    
    }
    
    private void cleverFunction(List first, List second) {
    System.out.println("Static type for first is " + .....);
    System.out.println("Static type for second is " + .....);
    }
    
    Ok, so, given a polymorphic call like this, is it possible, through
    whatever witchcraft necessary, to determine what the static types of
    the type polymorphic parameters are?
    
    Maybe some sort of interrogation of the stack? Maybe some sorta
    reflection?
    
    Ideas?
    christian
    http://christian.bongiorno.org/resume.PDF
- 12
  - Changing the Background Color for One Cell in a JTableI've been working on this for a few hours. I've read tutorials and seen
    different examples, but this is still driving me nuts.
    
    I have a table and want to be able to change the color of one cell in it.
    It seems to do this, I can't get a cell renderer and just change the color,
    I have to create my own class to do that. I've tried that and a number of
    other things and can't get it to work.
    
    I finally took the SimpleTableDemo from Sun and checked to make sure it was
    running. Once it was, I added four lines:
    
    boolean isSelected = table.isCellSelected(1, 1);
    DefaultTableCellRenderer defRender = (DefaultTableCellRenderer)
    table.getCellRenderer(1, 1);
    Component cellRenderer = defRender.getTableCellRendererComponent(table,
    "Huml", isSelected, false, 1, 1);
    cellRenderer.setBackground(Color.blue);
    
    (The whole example is at the bottom of this post.)
    
    When I use this example, it turns ALL the cells in the table blue, not just
    the one at 1,1.
    
    I've got several questions about this:
    1) Do I have to create my own cell renderer to change a cell background
    color, or can't I just do it like above? Even when I used my own renderer,
    I still got the actual Component named cellRenderer using the same
    parameters, so what difference would doing it in a separate class make?
    2) The renderer needs the value that is in the cell currently. In my own
    program, I got that from the DefaultTableModel I was using. Here I just
    used the text that was put in that cell. Is there any way to get the cell
    value directly from the table? In this example, I tried getting a
    DefaultTableModel (by casting) from the table, but it didn't work, so I
    couldn't get the data by reading the cell.
    3) Why does this code (above) set the entire table and not just the cell at
    1,1?
    
    If anyone has a simpler example of how to set the background color in just a
    few lines, I'd be glad to see it. I can't believe how much I need to do
    just to change the background color in one table cell!
    
    Thanks for any help/insight!
    
    Hal
    
    ----------------example code----------------
    
    /*
    * SimpleTableDemo.java requires no other files.
    */
    
    import java.awt.Color;
    import java.awt.Component;
    import java.awt.Dimension;
    import java.awt.GridLayout;
    import java.awt.event.MouseAdapter;
    import java.awt.event.MouseEvent;
    
    import javax.swing.JFrame;
    import javax.swing.JPanel;
    import javax.swing.JScrollPane;
    import javax.swing.JTable;
    import javax.swing.table.DefaultTableCellRenderer;
    
    import com.hal.gui.HalCellRenderer;
    
    public class SimpleTableDemo extends JPanel {
    private boolean DEBUG = false;
    
    public SimpleTableDemo() {
    super(new GridLayout(1,0));
    
    String[] columnNames = {"First Name",
    "Last Name",
    "Sport",
    "# of Years",
    "Vegetarian"};
    
    Object[][] data = {
    {"Mary", "Campione",
    "Snowboarding", new Integer(5), new Boolean(false)},
    {"Alison", "Huml",
    "Rowing", new Integer(3), new Boolean(true)},
    {"Kathy", "Walrath",
    "Knitting", new Integer(2), new Boolean(false)},
    {"Sharon", "Zakhour",
    "Speed reading", new Integer(20), new Boolean(true)},
    {"Philip", "Milne",
    "Pool", new Integer(10), new Boolean(false)}
    };
    
    final JTable table = new JTable(data, columnNames);
    table.setPreferredScrollableViewportSize(new Dimension(500, 70));
    // table.setFillsViewportHeight(true);
    
    if (DEBUG) {
    table.addMouseListener(new MouseAdapter() {
    public void mouseClicked(MouseEvent e) {
    printDebugData(table);
    }
    });
    }
    
    //Create the scroll pane and add the table to it.
    JScrollPane scrollPane = new JScrollPane(table);
    
    //Add the scroll pane to this panel.
    add(scrollPane);
    
    //======================================================
    //Only part I have added is the next four lines
    //======================================================
    boolean isSelected = table.isCellSelected(1, 1);
    DefaultTableCellRenderer defRender = (DefaultTableCellRenderer)
    table.getCellRenderer(1, 1);
    Component cellRenderer =
    defRender.getTableCellRendererComponent(table, "Huml", isSelected, false,
    1, 1);
    cellRenderer.setBackground(Color.blue);
    }
    
    private void printDebugData(JTable table) {
    int numRows = table.getRowCount();
    int numCols = table.getColumnCount();
    javax.swing.table.TableModel model = table.getModel();
    
    System.out.println("Value of data: ");
    for (int i=0; i < numRows; i++) {
    System.out.print(" row " + i + ":");
    for (int j=0; j < numCols; j++) {
    System.out.print(" " + model.getValueAt(i, j));
    }
    System.out.println();
    }
    System.out.println("--------------------------");
    }
    
    /**
    * Create the GUI and show it. For thread safety,
    * this method should be invoked from the
    * event-dispatching thread.
    */
    private static void createAndShowGUI() {
    //Create and set up the window.
    JFrame frame = new JFrame("SimpleTableDemo");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    
    //Create and set up the content pane.
    SimpleTableDemo newContentPane = new SimpleTableDemo();
    newContentPane.setOpaque(true); //content panes must be opaque
    frame.setContentPane(newContentPane);
    
    //Display the window.
    frame.pack();
    frame.setVisible(true);
    }
    
    public static void main(String[] args) {
    //Schedule a job for the event-dispatching thread:
    //creating and showing this application's GUI.
    javax.swing.SwingUtilities.invokeLater(new Runnable() {
    public void run() {
    createAndShowGUI();
    }
    });
    }
    }
- 13
  - Good programming questionI was just wondering as to what is a better standard to program by. If
    I have a class like this:
    class MyClass {
    
    private int myVariable;
    
    private void myMethod1(){
    myVariable = 1;
    }
    private void myMethod2(){
    this.myVariable = 1;
    }
    
    }
    Which method is better? Is there a better choice? Does it make any
    difference which way I do it? Maybe this sounds like an insignificant
    question but I have done this both ways and just don't know if there is
    a good reason to go one way or the other.
- 14
  - Java in AT&T PWPHi,
    I was referred to you because I'm having a problem getting this to run in
    AT&T PWP (Personal Web Pages). I compile the Java Program using NetBeans
    IDE 3.6. I upload the .java, the .class and the .html files to my PWP
    library.
    
    import java.awt.*;
    import java.applet.*;
    import javax.swing.*;
    
    public class AppHelloWorld extends JApplet
    {
    public void init()
    {
    resize(700,100);
    }
    
    public void paint(Graphics g)
    {
    g.drawString("Hello, Applet world!", 10, 25);
    }
    }
    ---------------------------------------------------------------
    This is the page I run in the browser (Internet Explorer and Netscape).
    
    <HTML>
    <HEAD>
    <TITLE>Applet HTML Page</TITLE>
    </HEAD>
    <BODY>
    <H3><HR WIDTH="100%">Applet HTML Page<HR WIDTH="100%"></H3>
    
    <P>
    <APPLET code="AppHelloWorld.class" width=350 height=200>
    </APPLET>
    </P>
    
    <HR WIDTH="100%"><FONT SIZE=-1><I>Generated by NetBeans IDE</I></FONT>
    </BODY>
    </HTML>
    
    This is the message I get from the browser:
    java.lang.ClassFormatError: AppHelloWorld (Extra bytes at the end of the
    class file)
    
    The page will run in Edit*Plus and IE (FILE, OPEN, BROWSE) and Netscape
    (FILE, OPEN FILES, select document).
    
    Can you provide any information on how to get this to run in the browsers?
    
    Wayne Rawls
- 15
  - [OT] Teaching OO / Java (was: Concentric Circles Loosing It)Hi !
    "Anthony Borla" wrote:
    >
    > "Alan P" <email***@***.com> wrote in message
    > news:br0efp$ola$email***@***.com...
    > >
    > > I'm a newbie Java student as well, and AFAIK we all start
    > > the same way -> by using a 'Turtle' class. Remember those
    > > little robot things from infant school, with the penUp(),
    > > penDown() etc.
    > >
    > > The idea is not stunning effects, but an introduction to OOPS
    [...]
    > I'm just a very firm believer [based mainly anectdotal, not statistical,
    > evidence] in teaching programming concepts from first principles which, to
    > me, means:
    >
    > * Teaching the rudiments of console windows / command-line
    > usage, which includes the use of editors, compilers, and similar
    > tools.
    
    O.k., this is meant to teach the "DE" (leaving out the leading 'I'). But
    maybe some people want their students to concentrate on the course theme, so
    they decide to use an IDE. Personally, I think one has to know how to deal
    with a language without any external (!) IDE, so you should know about
    "javac" and "java"...
    
    >
    > Taking a Windows environment as an example, all that is needed
    > is knowing how to:
    >
    > - Open up a Command Window
    > - Load and use Notepad [or one of its more versatile
    > replacements]
    > - Invoke javac.exe and java.exe
    >
    > * Teaching language syntax basics using a serial execution
    > programming model, a fancy description for a program
    > which executes by starting at point A and proceeding
    > downwards towards towards point B e.g.
    >
    > ...
    > public static void main(String[] args)
    > {
    > // Point A
    > ...
    > ...
    > // Point B
    > }
    > ...
    >
    > Once students have grasped the basics of structured / object-based
    > programming, all in a serial, non-GUI enviroment, the rudiments of OOP
    > [inheritance, polymophism] can be taught.
    
    This will teach students to write programs the serial way first. In my
    opinion, it would be the better approach to teach basic OO concepts first
    (before even invoking an editor for the first time, maybe using some
    pseudo-language).
    
    Using your approach, students would learn how to write an imperative program
    frist (one big main() method). Then you would introduce a completely new
    paradigm, the structured programming, using functions (other than the main()
    method, but still implementing a single class). Later on, you would
    introduce yet another paradigm, the object-oriented programming implementing
    specialized classes which will focus on certain tasks.
    
    Have you ever tried to teach oo concepts to a - let's say - COBOL programmer
    (nothing to say against COBOL programmer, of course, replace with almost any
    3GL you (don't) like)? You will have a very hard time unless he (or she)
    will understand them, because the imperative paradigm will block their view
    onto objects. So I would always prefer to teach the object-oriented way
    first. For most people, it will be quite easy to write "one big main()
    method" if they are forced to do it, and the oo paradigm will not stand in
    their way.
    
    > Once these basics have been
    > mastered, the next steps could be taken, which would probably be one, or
    > more, of the following:
    >
    > * Algorithms / Data Structures
    
    Data Structures might well be renamed "Object Oriented Design"... ;-)
    
    > * Concurrent / Advanced Programming
    > * Event-driven / GUI Programming
    >
    > I guess you would describe me as decidedly 'old school' in this regard :)
    !
    >
    > In a nutshell, I'm not comfortable with the notion that GUI's and graphics
    > simplify the teaching of very important, fundamental programming ideas,
    but
    > I probably hold a minority opinion here.
    >
    > Programming, like mathematics, can be an exciting field. However, much
    > effort, most of it in mundane areas, must be expended to satisfactorily
    > grasp the basics on which all further learning progress rests. I can
    > appreciate course designers wanting to make programming more interesting
    or
    > accessable, hence the use of GUI's and similar tools, or presenting ideas
    in
    > graphical form. IMO, though, it is best to avoid such things as they sport
    > hidden complexities, and keep things as simple as possible, at least until
    a
    > firm grounding in the basics has been obtained.
    
    Yes. But one might define "basics" somewhat different. You must not have (I
    might even say "should not have") any knowledge about "serial" or
    "functional" programming to learn to write good OO programs.
    
    (O.k., I might have started another thread on this, but then...)
    
    Cheers,
    Michael