java-programmer >>Struts, Spring, ... what about Swing?

Struts, Spring, ... what about Swing?

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- 3
  - CRC check logic/programHi Everyone,
    I want to write the CRC check routine. And looking for help.. ;o((
    Any link or leads will help me..
    Thanks.
    RSB
- 6
  - cloudscapeI'm a newbie in cloudscape (Java too) and I'm having a problem. I've
    followed the tutorial that comes with cloudscape to the letter. Everything
    worked as advertised up untill this program:
    
    /*
    * Licensed Materials - Property of IBM
    *
    * (C) Copyright IBM Corp. 2000, 2001
    * All Rights Reserved.
    */
    import java.sql.*;
    
    public class CreateWorldDB {
    
    public static void main (String[] args) {
    
    try {
    
    Class.forName("com.ibm.db2j.jdbc.DB2jDriver").newInstance();
    System.out.println("Loaded the Cloudscape JDBC
    driver. Hello, World!");
    Connection conn =
    
    DriverManager.getConnection("jdbc:db2j:HelloWorldDB;create=true")
    
    ;
    System.out.println("Created and connected to
    
    database HelloWorldDB");
    
    } catch (Throwable e) {
    System.out.println("exception thrown");
    e.printStackTrace();
    }
    
    }
    
    }
    
    I run it with "java -Dbd2j.system.home=C:\tutorial_system CreateWorldDB"
    
    And results in:
    Loaded the Cloudscape JDBC driver. Hello, World!
    exception thrown
    java.sql.SQLException: No suitable driver
    at java.sql.DriverManager.getConnection(Unknown Source)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at CreateWorldDB.main(CreateWorldDB.java:18)
    
    What's going on? It can connect with that driver but it can't create/access?
    I'm highly confused...
    
    I'm running J2SE/HotSpot VM 1.4.2_03 and cloudscape5.1
    
    Thanks,
    Rob
- 6
  - trying to fix oneTouchExpandable button size in JSplitPane's dividerThe BasicSplitPaneDivider class uses some custom-painted buttons for
    the oneTouchExpandable buttons on the divider. Trouble is, they're
    effectively hard coded to a fixed pixel size (final static int
    ONE_TOUCH_SIZE = 6). At 144 dpi, that's really too small to use
    comfortably.
    
    I really don't want to subclass all the assorted JSplitPane pieces to
    fix this and am hoping there's another way.
    
    I tried scaling the Graphics2D in the paint() of a containing panel
    and then of JSplitPane directly, either way the UI gets out of whack -
    components don't get placed correctly, the divider drag hotzone
    doesn't line up with the divider visually, etc.
    
    Am I approaching the scaling wrong or is this a dead end? Other
    alternatives?
- 8
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- 8
  - J2EE programming on very old computerHi
    I've old computer (Celeron 300 HHz, 64 RAM, WIN98)
    Cold You say me, which app I need to start learn Java (J2EE) on this computer.
    
    Best regards
    
    Krzysztof
- 8
  - javadoc wierdness - on suns own sourceWhat the heck is going on here? The only error in my projects documentation,
    and it's in suns own source!?
    
    C:\j2sdk1.4.2_04\source\javax\swing\table\AbstractTableModel.java:64:
    warning -
    @param argument "column" is not a parameter name.
    
    C:\j2sdk1.4.2_04\source\javax\swing\table\AbstractTableModel.java:64:
    /**
    * Returns a default name for the column using spreadsheet conventions:
    * A, B, C, ... Z, AA, AB, etc. If <code>column</code> cannot be
    found,
    * returns an empty string.
    *
    * @param column the column being queried
    * @return a string containing the default name of <code>column</code>
    */
    public String getColumnName(int column) {
    String result = "";
    for (; column >= 0; column = column / 26 - 1) {
    result = (char)((char)(column%26)+'A') + result;
    }
    return result;
    }
    
    --
    Mike W
- 8
  - javaw.exe - Xrs -jar my.jarAs I understand when Java program started this way it should ignore user
    logoff
    and continue working but it doesent for me :(
    
    I run my application from cmd on WinXP like this :
    javaw.exe - Xrs -jar my.jar
    
    When I logoff from system application exits , what I'am doing wrong ?
    
    regards,
    
    Os
- 8
  - Javascript : formname.body.value.length == 0 validationHi,
    We have a J2EE application which had jsp's that represent a form. When
    we submit the jsp's the form is converted into a mail and is sent using
    a mail server.
    In the jsp there is a validation where we check for the length of the
    body using the following:
    if (formname.body.value.length == 0)
    {
    isFormComplete = false;
    }
    
    Need to know which are the possible cases when the length of the form
    could be '0'.
    The behaviour is real weird. Roughly 2 out of 10 times the length comes
    as 0 even when the user enters all the details. What could be the
    reason for the same ?
    Any pointers are highly appreciated.
    
    Regards,
    Parag
- 9
  - JTextComponent questionI have a Paste method that will take in a JTextComponent. I am passing
    either JTextField's or JTextArea's. I need to do something differently
    based on a JTextArea.
    
    I have no problem determining if I have a JTextField or a JTextArea. The
    problem I am having is that I need to know which JTextArea component I
    have. What is the instance name of the JTextArea.
    
    Example say between these two..
    
    JTextArea jTextAreaA
    JTextArea jTextAreaB
    
    I have tried some reflection. What could I be missing?
    
    private void paste(JTextComponent target)
    {
    final String method = "paste(JTextField "+target.getText()+" ): ";
    if (DEBUGMODE )System.out.println(_Debugheader+ method);
    appUtil.setStatus(jStatusArea, _readyMsg, _READY);
    try {
    Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard();
    Transferable content = cb.getContents(this);
    String s = (String)content.getTransferData(DataFlavor.stringFlavor);
    target.setText(s.trim());
    } catch (Exception e) {
    appUtil.setStatus(jStatusArea, _errorMsg, method + " " + e);
    }
    if (target instanceof JTextArea) {
    //
    // if jTextAreaA
    // do something
    }
    }
    
    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-)
- 10
  - Socket functionality on jre 1.6.0 beta b59g
    OK, it seems that on Windows XP Pro, that Socket has changed significantly,
    breaking lots of my code.
    
    Using "localhost" no longer appears to work to create a Socket object
    on a port. Have to use "127.0.0.1" instead. Other aspects of Socket
    also appear to be flaky/changed... I can certainly "ping localhost" so
    it's not that localhost has a problem.
    
    Can someone please explain the plain Socket changes for this new 1.6 ??
    
    java version "1.6.0-beta"
    Java(TM) 2 Runtime Environment, Standard Edition (build 1.6.0-beta-b59g)
    Java HotSpot(TM) Client VM (build 1.6.0-beta-b59g, mixed mode, sharing)
- 11
  - Eclipse 3.0 Running ILLEGALY on KaffeDalibor Topic <email***@***.com> writes:
    
    >> When I instruct my computer running the Debian OS to load and run
    >> eclipse, the code from some JVM package and the code from the Eclipse
    >> package and from dozens of others are loaded into memory. The process
    >> on my computer is mechanical, so we should look back and see who has
    >> designed and created this particular combination. In this case, it
    >> was Debian, who took the top level Eclipse component and selected
    >> a particular JVM and particular support libraries to include.
    >
    > That's the 'running is illegal/GPL puts restrictions on use' fallacy. :)
    
    I'm not talking about running; I'm talking about making a copy of
    Eclipse and a copy of Kaffe and putting them both on an end-user's
    system such that when I type "eclipse" I get a program made out of
    both.
    
    But you can see that it's not mere aggregation, because they invoke
    each other when run.
    
    -Brian
    
    --
    Brian Sniffen email***@***.com
    
    --
    To UNSUBSCRIBE, email to email***@***.com
    with a subject of "unsubscribe". Trouble? Contact email***@***.com
- 11
  - [Sizing: Tomcat 4.1.x] Memory Usage for the Session TrackingHello all,
    
    i'd like to know how much memory the application server
    have been used for tracking a new session.
    
    i've tried the jProfiler from the ej-Tech however i found
    seems it don't have an easy way to calculate the total
    amount of memory the related object instacnes used for the
    session tracking. i guess org.apache.catalin.session* is
    the point to start with, however, to me, it's a little too
    hard.
    
    do anyone of you have did this similar thing?
    
    say, to calculate the total amount of memory used, when a
    browser visit a particular page, and the server create new
    sesssion related objects and return the browser a new cookie
    with 2 attributes initialized? e.g., name="matthew", sex="M"?
    
    thanks a lot in advance.
    
    ---
    matthew
- 13
  - HELP Unkown Error!!"Alex" wrote:
    
    > I wrote a java gui program under win, and there is no problem ,
    > all is OK, when i run it on linux on the console appear a message
    > every few seconds:
    >
    > 25-ago-2003 17.15.04 java.util.prefs.FileSystemPreferences
    > syncWorld AVVERTENZA: Couldn't flush system prefs:
    > java.util.prefs.BackingStoreException: Couldn't get file lock
    
    Sun fucked up the new preference API implementation. It tries to get
    access to a file under /etc. Check the VM installation instruction and
    create the file.
- 15
  - Change listbox mouse selection to not use ctrl keyI'm converting a program from Windows where the LBS_MULTISEL option allows
    selecting rows in a table with a single mouse click. On the other hand,
    with Swing you need to hold down the ctrl key and then it's buggy,
    seemingly requiring rows to be clicked from top to bottom.
    
    If there's an example of changing the Swing behavior, I haven't found it.
    I've made some progress figuring it out but can't spare much more time.
    
    Anyone know of a working solution? I can't be the only one needing it.
    
    I can post what I've tried so far if a ready-made solution isn't available.
    
    John
- 15
  - Server vs Client validationOn Fri, 30 Jul 2004 11:52:25 +0200, Rogan Dawes <email***@***.com>
    wrote or quoted :
    
    >And it is developers that think like you that enable exploits like
    >buffer overflows, SQL injection, etc
    >
    >Sudsy has it 100% right. The server can NEVER trust what the client is
    >sending it. ALWAYS revalidate EVERYTHING that you receive.
    >
    >By all means, make it easy for the client by performing interactive
    >validation, prompting, etc.
    
    In email, Rogan brought up the issue of what servers have to do to
    revalidate Strings.
    
    I mentioned earlier if the String must have one of a fixed set of
    values how you can convert that to a country-index, state-index etc.
    Then all you need do in the server is bounds check on the int.
    
    For general strings, in DOS Abundance I categories characters as
    numeric, alphabetic, lower case, upper case, accented, printable,
    space, control char.
    
    You can declare that a string can only contain certain classes of
    character. That gets automatically checked on a keystroke basis, and
    automatic conversion sometimes happens to lower case, to upper case,
    or to strip accents.
    
    If you had a similar facility in your client level validation, you
    have to repeat it in the server. You don't need to deal with
    translation, just validation, since any missing translation is clear
    fraud.
    
    Sometimes strings are combos of words, e.g. a list of fruit names from
    a fixed list of fruit names. These can be converted to int bit masks.
    The server does not need to validate these at all, just mask off any
    unused bits.
    
    --
    Canadian Mind Products, Roedy Green.
    Coaching, problem solving, economical contract programming.
    See http://mindprod.com/jgloss/jgloss.html for The Java Glossary.

Author

Message

timasmith

Posted: 2006-6-17 10:53:00

Top

java-programmer, Struts, Spring, ... what about Swing? So many Web frameworkings seem to have sprung up but are there any
really good frameworks for fat clients using things like Swing?

I am most interested in how the server side objects interact with Swing
components, the design patterns behing client/middleware/server/db apps
etc.

thanks

Tim

Index ‹ java-programmer

Next
- 1
  - How to detect existing text tables in a hsql db?I have a Java-Application that creates several text-tables at the first
    start. When I start the application again I just want to check, if the
    text tables exist. But the application always returns a "false, table
    does not exist" and the localdb.properties and localdb.script files are
    written new. After that, the tables can be detected, but only until the
    next start of the application.
    
    dbcon.connect(LOCALDRIVER, LOCALPROTOCOL, LOCALDATABASE, LOCALUSER,
    LOCALPASS);
    
    DatabaseMetaData metadata = dbcon.con.getMetaData();
    String[] aTyps = new String[]{"TABLE"};
    
    ResultSet result = metadata.getTables(null, null, "%", aTyps);
    while (result.next()) {
    System.out.println(result.getString("TABLE_NAME"));
    }
    result.close();
    
    Susanne
- 2
  - Use of JVM id and Event Notifier patternIn our design for event subscription/publication, a JVM id is used to
    identify the event channels (or event brokers). The JVM id refers to
    an EventChannel on a host and there will be one EventChannel per host.
    
    FYI, More information about Event Notifier pattern is available at:
    
    http://members.ispwest.com/jeffhartkopf/notifier/
    
    Is it okay to refer to JVM id (kernel level details) to identify a
    user level class like EventChannel ? I feel that EventChannel should
    be referred by some other way.
    
    Any pointers will be appreciated.
    
    B.
- 3
  - Regex syntaxI have managed to form the regex for the following two:
    
    CTL = <any US-ASCII control character (octets 0 - 31) and DEL (127)>
    
    String CTL_REGEX = "([[\\x00-\\x1F]\\x7F])";
    
    LWS = [CRLF] 1*( SP | HT )
    
    String LWS_REGEX = "((\r\n)??( |\\x09)+?)";
    
    However, the following stumped me for hours.
    
    TEXT = <any OCTET except CTLs, but including LWS>
    
    String TEXT_REGEX = ...... // help me out please.
- 4
  - Which IDE to choose (more specific than earlier, very similar post)?Hello guys,
    
    I'm C++/Windows programmer and I'd like to smoothly switch to Java. I read
    replies to earlier, very similar post, but I didn't even hear about such
    IDEs :-(
    My question is following: using what IDE can I easily create applets with
    controls like edit, list, combo boxes, buttons, tree controls and - this is
    very important - have support to draw 3D graphics? Some time ago I was using
    Borland JBuilder, but I guess it was not intended for building commercial
    releases. I was browsing Sun Microsystems' site and found free "Sun Java
    Studio Creator, Early Access". Can I create in it commercial applets using
    features that I described above? If not, please advise me something free or
    really good enough (read: easy to develop applets) to spend money IDE;
    preferably free of course :-)
    Generally I focused on "Sun Java Studio Creator, Early Access", but I'm
    waiting for your replies.
    Please reply, your opinion is crucial for me.
    
    Regards
    
    P.S. I'm not going to create server-side applets. I will be doing applets
    run in web browser.
- 5
  - Eclipse won't startHi
    
    I have just installed eclipse-2.1.1_2 on my FreeBSD 4.8 computer.
    When I try to run it I get:
    
    java.lang.UnsatisfiedLinkError:
    /usr/local/eclipse/plugins/org.eclipse.swt.gtk_2.1.1/os/freebsd/x86/lib
    swt-pi-gtk-2135.so: /usr/local/lib/libgthread-2.0.so.200: Undefined
    symbol "pthread_attr_destroy"
    at java.lang.ClassLoader$NativeLibrary.load(Native Method)
    at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1382)
    at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1290)
    at java.lang.Runtime.loadLibrary0(Runtime.java:749)
    at java.lang.System.loadLibrary(System.java:820)
    at org.eclipse.swt.internal.Library.loadLibrary(Library.java:108)
    at org.eclipse.swt.internal.gtk.OS.<clinit>(OS.java:18)
    at org.eclipse.swt.widgets.Display.create(Display.java:469)
    at org.eclipse.swt.graphics.Device.<init>(Device.java:111)
    at org.eclipse.swt.widgets.Display.<init>(Display.java:303)
    at org.eclipse.swt.widgets.Display.<init>(Display.java:299)
    at org.eclipse.ui.internal.Workbench.run(Workbench.java:1361)
    at
    org.eclipse.core.internal.boot.InternalBootLoader.run(InternalBootLoade
    r.java:858)
    at org.eclipse.core.boot.BootLoader.run(BootLoader.java:468)
    at java.lang.reflect.Method.invoke(Native Method)
    at org.eclipse.core.launcher.Main.basicRun(Main.java:291)
    at org.eclipse.core.launcher.Main.run(Main.java:747)
    at org.eclipse.core.launcher.Main.main(Main.java:583)
    
    (eclipse:9359): Gtk-WARNING **: Unable to locate theme engine in
    module_path: "redmond95",
    
    Btw I have heard Eclipse has a C++ plugin, would it be possible to get
    that into the port collection?
    
    br
    socketd
    _______________________________________________
    email***@***.com mailing list
    http://lists.freebsd.org/mailman/listinfo/freebsd-java
    To unsubscribe, send any mail to "email***@***.com"
- 6
  - c prog socket connect to java programmy c program wants to send a message to java program through socket.
    The problem i have is the message received by java socket server
    is not a complete message most of time. Please see my attachment of
    c prog and java program.
    
    Thank you very much for your kind help.
    
    Mei
    
    Here is my c client program:
    
    #include <stdio.h>
    #include <sys/types.h>
    #include <sys/socket.h>
    #include <netinet/in.h>
    #include <netdb.h>
    
    void error(char *msg)
    {
    perror(msg);
    exit(0);
    }
    int main(int argc,char **argv) {
    FILE *fileIn; /* declare a FILE pointer */
    FILE *fileOut; /* declare a FILE pointer */
    char buffer[8000];
    char line[4000];
    char c;
    int create_socket;
    int bufsize = 1024;
    int len=0;
    int cnt=0;
    char *cmd = "XML2Marc,/export/home/mml/Marc4jProg/Marc4jTest/testcase/exporttsamnonowner5.xsl,MARC8,";
    int sockfd, portno, n;
    struct sockaddr_in serv_addr;
    struct hostent *server;
    fileOut = fopen("data/out.xml", "w");
    
    if(fileIn==NULL) {
    printf("Error: can't open file.\n");
    return 1;
    }
    else {
    
    strcat(buffer,cmd);
    
    if ( (fileIn = fopen("data/test.xml", "r")) != NULL) {
    fgets(line, sizeof(line), fileIn);
    }
    
    fclose(fileIn);
    
    strcat(buffer,line);
    strcat(buffer,"\r\n");
    
    len= strlen(line);
    printf("debug::buffer:: %d \n %s", len, buffer);
    fprintf(fileOut,"%s", buffer);
    
    portno = 5088;
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    
    if (sockfd < 0)
    error("ERROR opening socket");
    server = gethostbyname("hopper2.rlg.org");
    if (server == NULL) {
    fprintf(stderr,"ERROR, no such host\n");
    exit(0);
    }
    
    bzero((char *) &serv_addr, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    bcopy((char *)server->h_addr,
    (char *)&serv_addr.sin_addr.s_addr,
    server->h_length);
    
    serv_addr.sin_port = htons(portno);
    if (connect(sockfd,&serv_addr,sizeof(serv_addr)) < 0)
    error("ERROR connecting");
    n = write(sockfd,buffer,strlen(buffer));
    sleep(20);
    if (n < 0)
    error("ERROR writing to socket");
    bzero(buffer,4000);
    printf(" test ");
    
    n = read(sockfd,buffer,4000);
    if (n < 0)
    error("ERROR reading from socket");
    printf("output::: %s\n",buffer);
    printf("%d",n);
    if(strlen(buffer)<2){ //try another time
    n = read(sockfd,buffer,4000);
    if (n < 0)
    error("ERROR reading from socket");
    printf("output::: %s\n",buffer);
    }
    printf("File opened. Now closing it...\n");
    fclose(fileIn);
    fclose(fileOut);
    return 0;
    }
    }
    
    and here is the partial java program:
    
    public class Marc4jWorker extends Thread{
    ....
    public void run(){
    
    char[] ln=new char[8000];
    OutputStream outbound=null;
    InputStream inbound =null;
    
    while(true){
    String line="";
    int cc=0;
    String action= null;
    String style=null;
    String encode="UTF8";
    String xmlstr=null;
    //String line;
    
    try{
    inbound = client.getInputStream();
    int btecnt = inbound.available();
    byte[] bf=null;
    
    if(btecnt<=0)
    continue;
    else {
    bf = new byte[btecnt];
    inbound.read(bf);
    }
    
    //why the message is incomplete ????
    System.out.println("server: input bytes length:"+bf.length);
    line =new String(bf);
    if(Config.ENDREQ.equalsIgnoreCase(line)){
    outbound.close();
    client.close();
    System.err.println("request end");
    break;
    }
    
    //line = bf.toString(Config.ENC_UTF8);
    int ps_firstcomma =line.indexOf(',',0);
    int ps_secondcomma = 0;
    int sz=line.length();
    
    if(ps_firstcomma>0 && ps_firstcomma<sz-1)
    action=line.substring(0,ps_firstcomma).trim();
    ps_secondcomma=line.indexOf(',',ps_firstcomma+1);
    if(ps_firstcomma<ps_secondcomma && ps_secondcomma>0 &&
    ps_secondcomma<sz-1)
    style=line.substring(ps_firstcomma+1,ps_secondcomma).trim();
    ps_firstcomma=ps_secondcomma+1;
    ps_secondcomma=line.indexOf(',',ps_firstcomma+1);
    
    if(ps_secondcomma>0 && ps_secondcomma<sz-1){
    encode=line.substring(ps_firstcomma,ps_secondcomma).trim();
    Log.println("server encode:"+encode);
    
    //for action is xml2marc, input xml encoding is always UTF8
    if(action.equalsIgnoreCase("xml2marc")){
    xmlstr= new
    String(bf,Config.ENC_UTF8).substring(ps_secondcomma+1);
    
    }else if("marc2xml".equalsIgnoreCase(action)){
    if(Config.ENC_UTF8.equalsIgnoreCase(encode))
    xmlstr= new
    String(bf,Config.ENC_UTF8).substring(ps_secondcomma+1);
    else
    xmlstr= new
    String(bf,Config.ENC_ISO).substring(ps_secondcomma+1);
    
    }else{
    System.out.println("Unsupported Action!");
    continue;
    }
    }
    
    FileOutputStream fout =null;
    
    String rs = null;
    if(action.equalsIgnoreCase("xml2marc")){
    if(Config.ENC_UTF8.equalsIgnoreCase(encode)){
    fout = new FileOutputStream("/tmp/servertest.input",true);
    fout.write(xmlstr.getBytes(Config.ENC_UTF8));
    fout.close();
    }
    else {
    fout = new FileOutputStream("/tmp/servertest.input",true);
    fout.write(xmlstr.getBytes(Config.ENC_ISO));
    fout.close();
    
    }
    rs = Xml2Marc.toMarc(style,encode,xmlstr);
    
    }else if(action.equalsIgnoreCase("marc2xml")){
    if(Config.ENC_UTF8.equalsIgnoreCase(encode)){
    fout = new FileOutputStream("/tmp/servertest.input",true);
    fout.write(xmlstr.getBytes(Config.ENC_UTF8));
    fout.close();
    }
    else {
    fout = new FileOutputStream("/tmp/servertest.input",true);
    fout.write(xmlstr.getBytes(Config.ENC_ISO));
    fout.close();
    }
    rs = Marc2Xml.toXML(style,encode,xmlstr);
    }
    
    fout = new FileOutputStream("/tmp/servertest.output");
    outbound =client.getOutputStream();
    if(rs==null || rs.length()==0)
    rs="00005";
    
    if("Xml2Marc".equalsIgnoreCase(action)){
    if(encode.equalsIgnoreCase(Config.ENC_UTF8)){
    outbound.write(rs.getBytes(Config.ENC_UTF8));
    fout.write(rs.getBytes(Config.ENC_UTF8));
    }else{
    fout.write(rs.getBytes(Config.ENC_ISO));
    outbound.write(rs.getBytes(Config.ENC_ISO));
    }
    }else if("Marc2Xml".equalsIgnoreCase(action)){
    outbound.write(rs.getBytes(Config.ENC_UTF8));
    fout.write(rs.getBytes(Config.ENC_UTF8));
    }
    
    outbound.flush();
    fout.close();
    
    } catch (IOException e) {
    Log.println("Read failed"+e.toString());
    System.exit(-1);
    }catch(Exception e){
    Log.println("server error:"+e.toString());
    }
    
    }
    
    }
- 7
  - sourse & installationhere i'm for asking to u all that how can i install or download java
    run time base running with console via internet.
- 8
  - Newbie Question - ArrayLists and methodsHello all (again),
    
    My problem here is that I'm trying to build a list of ArrayLists that
    hold data and I want to add the newly derived data into a table where
    it's dependent on the first row. A short version of my program to
    illustrate what I mean:
    
    import java.util.*;
    public class MyProg2 {
    public static void main(String[] args) {
    List table = new ArrayList ();
    List <Integer> data = new ArrayList <Integer>();
    data.add(1);
    data.add(3);
    data.add(4);
    table.add(data);
    
    System.out.println ("table(0) = " + table.get(0));
    
    ArrayList <Integer> newNode = new ArrayList <Integer>();
    newNode = createNode((ArrayList)table.get(0),0);
    table.add(newNode);
    System.out.println ("Added in a new row and table is now:");
    System.out.println ("table(0) = " + table.get(0));
    System.out.println ("table(1) = " + table.get(1));
    
    } //end main driver
    public static ArrayList createNode(ArrayList items,int lParen){
    int a = 0; int b=0; int c=0;
    if (items.size() >= 2){
    a = Integer.valueOf(items.get(lParen).toString());
    b = Integer.valueOf(items.get(rParen).toString());
    c = a + b;
    items.remove(lParen);
    items.remove(lParen);
    items.add(lParen,c);
    }
    return items;
    }
    }
    
    (I'm unable to get rid of all the unchecked msgs because putting the
    <Integer> tag sometimes made the program uncompilable. Use --nowarn
    when you compile this program. :)
    
    Iin this code, row 0 of table is changed in the method while it
    creates row 1, but I don't understand why and don't know how to keep
    it from changing. From this behavior, it's leading me to believe
    ArrayLists are passed by value or is this the way of ArrayLists? I
    thought parameters were passed by reference? What am I missing here?
    
    -t
- 9
  - Creating tiled image from multiple tiff sources in JAIHi all,
    
    My situation is as follows. I have a number of tiff files containing
    adjacent tiles which I would like to combine into one image. Currently I
    achieve this goal in the following manner using the Java Advanced Imaging
    library:
    
    1) Create a target TiledImage with attributes appropriate to hold all tiles.
    2) Load each tiff file into a separate PlanarImage.
    3) Get the Rasters of each of these PlanarImages and translate coordinates
    according to the rectangle they must occupy in the target TiledImage
    4) Invoke TiledImage.setData(Raster) with the translated raster for each
    tile
    
    This works ok, but it does not seem to take advantage of the JAI's
    pull-model; image data is loaded into memory immediately, probably as a
    consequence of the call to getRaster(). However I wish to defer the loading
    of image data into memory until it is needed, because only a subset of all
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    I hence believe I need something along the lines of the NullOpImage class.
    Unfortunately, the constructor for this class only takes a single source,
    while I need to be able to pass a source for each tiff tile. One solution is
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    things myself. Is this the way to go about it, or is there a better and
    easier solution?
    
    Any suggestions will be greatly appreciated.
    Regards,
    Michael.
- 10
  - EnterpriseBean and finalize()Hi Everyone,
    I'm trying to learn EJB and picked up a copy of the book "SCBCD Exam
    Study Kit" by Paul Sanghera. Inside it, I came across the following
    sentence, which piqued my interest because I cannot see a) where this
    can be found in the EJB 2.0 specification (actually, I was looking in
    the J2EE 1.3 specification), or b) why finalizing a bean would be
    interfering with the responsibilities of the container. Here's the
    quote:
    
    "... the bean class must not have any finalize() method because by
    doing this you would be stepping on the container's toes, since it is
    the responsibility of the container to manage the lifecycle, threads,
    garbage collection, and so forth."
    
    If anyone can shed a little light on this, and dispel the confusion,
    I'd really appreciate it.
    
    Many thanks,
    
    Jono
- 11
  - HELP needed: Small Java applet I need a graphic Java applet that makes the following steps:
    
    Given a circumference of radius "r",
    
    Draw onscreen, say, 20 random radius.
    
    Then, every time you press a button:
    
    Rotate the 20 radius a given random angle (same for everyone).
    
    Draw the new radius onscreen.
    
    Note: The radius endpoints should be stored in float arrays and drawn as
    float. (Of course one of the endpoints of every radius would be the center
    of the circumference.)
    
    I'm not very good at Java at the moment but I'd like to transform an old
    program from QBasic into a java applet and I think that this little
    framework is all I need. What I am getting at the moment is a lot of
    compilation errors I don't understand.
    
    The program I want to transform is here:
    
    http://www.josechu.com/moving_fractal/index.htm
    
    Thanks,
    
    Josechu
- 12
  - client server communication in java I have a java web service that returns byte arrays to the client.
    First a byte array is returned and the server gets the acknowledgement,
    then the next byte array is sent and so on. But I don't have much idea
    how to implement it. How can I resume from where I stopped at the
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- 13
  - java.sql.SQLException: Io exception: The Network Adapter could not establish the Hi,
    I am sridhar, i have Oracle 10g express on my machine , when i am
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    am getting the following Exception:
    
    java.sql.SQLException: Io exception: The Network Adapter
    could not establish the connection.
    
    How can i resolve this problem,can any one give me the appropriate
    solution.
    
    Thanks
    Sridhar
- 14
  - renameTo for Directories on SolarisI've been attempting to rename a directory on Solaris 8 and continue to
    have problems.
    
    I read other threads that mention it is not possible to do when moving
    between partitions on Solaris, but I am renaming to the same
    paritition.
    
    I am basically attempting the following:
    
    File oldName = new File("/opt/OldDirectoryName");
    File newName = new File("/opt/NewDirectoryName");
    
    if ( oldName.renameTo( newName ) )
    // Successfully renamed
    else
    // Failed to rename
    
    For some reason I seem to continually be unable to do this.
    
    Any ideas?
    
    Eric
- 15
  - converting between double and integerI have a variable declared as a double as :-
    
    sValue = Math.floor(Math.sqrt(polynomialDegree));
    
    where 'polynomialDegree' is an integer.
    
    How do I convert 'sValue' to an integer?? I cant declare sValue as an
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    intValue() but keep getting an error saying 'double cannot be dereferenced'
    
    Where am i going wrong?
    
    Thanks