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Index ‹ java-programmer
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- 1
- design problem: visitor/multiple dispatch or?Greetings and salutations,
I'm struggling with a bit of a mess (solely created by me and myself).
Suppose a bunch of types (classes) exist, say, T_1, T_2, ... T_n, implementing
a single interface or inheriting from some (abstract) base class T. Also assume
that some 'applicators' exit, say, A_1, A_2 ... Am, all implementing an interface
(or abstract base class) equivalent to --
interface Applicator {
Object apply(T ta, T tb);
}
If both sets T_i and A_j are 'fixed', i.e no new classes T_p nor A_q enter
my messy arena, I could implement all A_i as visitors to the T_j classes
in order to get their job done. OTOH, all T_j classes could double dispatch
the 'A_i.apply' methods to their T_j counterparts to get the job done.
I realise that some form of a Cartesian product of 'apply' methods must
reside somehwere, somehow ...
For the sake of the example, think of the T_j as being subclasses of classes
Short, Int, Long, Double, and let the Appliers be something like 'Add', 'Sub'
etc. i.e. the folllowing code snippet should make sense --
Add myAdd= new Add();
Dbl myDbl= new Dbl(41);
Int myInt= new Int(1);
// assume Num is a superclass of Dbl and Int
Num total= myAdd.apply(myDbl, myInt);
Variable 'total' should have type 'Dbl' in this example. As I wrote above,
there would be no problem if at least set T_j would be fixed; the visitor
pattern would do fine. If set A_i would be fixed the multiple dispatch
pattern (over the set T_j) would be a fine fit. But what to do if both sets
may be expanded?
I've fiddle-diddled with introspection, synthesizing class names given a T_i
and T_j, caching them in hashmaps but to no avail -- my code is a mess and
my design is something I'm ashamed off. I would really appreciate it if
some kind soul here could enlighten me.
TIA, and kind regards,
Jos
- 1
- Inidicator Arrow convention for Sort OrderWhich way should an arrow point to indicate an ascending sort or an
ascending list follows?
For an ascending sort the bigger numbers are at the bottom.
So no matter which way you do it, you can misinterpret.
Is there some other less ambiguous convetion to use?
--
Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.
- 3
- Client application using Weblogic JMS ServerHello, I'm Jose from Barcelona,
I'm not at all expert on JMS, and my question is about how can I
connect a client application running java with a remote JMS Weblogic
Server. I've developed a client program and tested it with a Sun J2EE
server running on a XP box, but the goal is to make it run on an
iSeries machine connecting a WebLogic JMS Server.
My questions are:
Do I have to install some application software on the client box?
Is there any difference between connection with remote JMS servers and
connection with local ones?.
I hope you can help me.
Thank You.
- 5
- drag and drop in a JMenu/JMenuItem
Can someone please point me to some sample code that allows drag and
drop in a JMenu/JMenuItem. I know that Java doesn't support dnd in
the menu stuff, but I need it anyway. Technically speaking it doesn't
have to be a popup menu, but would be nice, as long as it has the look
and feel of a popup menu (i.e. fonts, size, etc.). An example of what
I'm talking about, via menus, is the start menu under Windows. Those
menus allow you to do dnd, but of course it's Windows and they allow
anything and everything. Just to note I'm using JDK 1.5.x if that
helps for the code direction.
- 5
- Thoughts on Code reviewI need some advice guys.. I am proposing that we get someone to do a
complete audit/review of our Java application codebase, about 1000
JSPs/Servlets and 100 EJBs. If I get firms to submit proposals, what
should I be asking /looking out for? I realise that running the
applications through a migration tool will help but I am looking for a
more through analysis of the actual codebase as well as assessment of
the architecture
Thanks
Arvie
- 6
- how to draw ER and UML diagram in eclipse?what free eclipse plugin do you use to draw database ER diagram and
UML diagrams?
I've tried omondo years ago, it leaks memory so bad back then and
always crash my eclipse, is it getting better now?
- 6
- truncating java doublesHi,
How do you truncate java doubles? I am trying to convert a double to a
number thats rounded to 3 decimal places - i can do this using BigDecimals
easily but cant seem to find anything to do the same with a double.
Thanks
- 7
- Debugging API classes in NetbeansWhen Im debugging my program in Netbeans, and I try to debug into API
(e.g. Swing JPanel) the debugger tells me that the source of the class
has not been found in mounted filesystem. Even though
c:\j2sdk1.4.2_02\src.jar is indeed mounted.
How do I debug into API classes?
Thanxxxx,
Barsum
- 12
- Java SoundI am intersted in building an applet that can both play and record
sound files. I would like this to work on the widest range of platforms
(MAC, Linux, WinXP, WinNT, etc) and browsers. What would be the best
file format for the sound files to accomplish this? Would it be MP3,
WAV, or what? I am looking to have this work without any added packages
over and above JDK 1.4.x.
Thanks for any and all info.
- 12
- Serializable : readObject and writeObjectHello,
I have 3 classes Personne, entreeb==>FileInputStream ,
sortieb==>FileOutputStream.
The code works one time. The problem is when I add serialized new objects
( launch again the code sortieb) I can't read all objects (entreeb) specific
a new objects added.
have you an idea?
Thanks form help
-----------------------------------------------------------
-----------------------------------------------------------
//Class Personne
import java.io.*;
class Personne implements Serializable {
private String nom;
private int age;
public Personne(String n, int a){
nom = n;
age = a;
}
public void aff() {
System.out.println (nom + " " + age);
}
}
------------------------------------------------
//Flux in
import java.io.*;
import java.util.*;
public class entreeb {
public static void main(String[] args){
Personne p;
int i=0;
try {
FileInputStream fist= new FileInputStream("Personne.ser");
ObjectInputStream oist = new ObjectInputStream(fist);
try {
while (true)
{ System.out.println("i="+i);
p = (Personne) oist.readObject();
p.aff();
i++;
}
} catch (EOFException e) { }
oist.close();
} catch (Exception e) {
System.out.println("Exception loading personne : " + e.getMessage());
}
}
}
------------------------------------------------------------------
//Flux out
import java.io.*;
import java.util.*;
public class sortieb {
public static void main(String[] args) throws IOException {
Personne p = new Personne("name", 55);
File f=new File("Personne.ser");
FileOutputStream fost= new FileOutputStream(f,true);
ObjectOutputStream oost = new ObjectOutputStream(fost);
int i=0;
while (i<5) {
System.out.println("i = "+i+ "p="+p);
oost.writeObject(p);
i+=1;
}
oost.close();
}
}
- 12
- How to ignore invalid SSL CertificatesHi everybody :-)
I'm trying to build an application that serves as a Client Side
frontend for a webpage using HttpClient 2. Because I have some security
problems I decided that using https would be nice, but my SSL
certificates continue to fail validation and I'm wondering wether it is
possible to let HttpClient ignore Certification Failures? And if yes,
could you please give me a working example?
Greets,
- 12
- Check for time functionHello all...I have an issue with one of my java script functions that
I'm hoping someone can easily help with. I have a web based application
that we use to create/sign up for overtime. When we have holidays we
require our employees to sign up in 4 hr increments for the times we
post. I'm having trouble creating a time slot that ends @ 12am. 12pm
and all other hours work fine for start/end times. however 12am causes
problems. My actual script code for this function is below. Someone
help!!!
<SCRIPT language="JavaScript" src="frmvalidation.js"
type="text/JavaScript"></SCRIPT>
<script language="javascript">
function checkValidHoliday(value)
{
if (value=='Y'){
hourblock.style.visibility ='visible';
}
else{
hourblock.style.visibility ='hidden';
}
}
function checkHoliday(frm)
{
if(frm.txtIsHoliday.value=="Y")
{
strFromDt= new Date(frm.txtLimitDate.value);
strToDt= new Date(frm.txtLimitToDate.value);
FromHr=parseInt(frm.txtLimitFrom.value);
FromAMPM=frm.txtLimitFromAM_PM.value;
ToHr=parseInt(frm.txtLimitTo.value);
ToAMPM=frm.txtLimitToAM_PM.value;
if((FromAMPM=="PM") && (FromHr!=12))
FromHr=FromHr+12;
if((ToAMPM=="PM") && (ToHr!=12))
ToHr=ToHr+12;
var fromDt= new
Date(strFromDt.getFullYear(),strFromDt.getMonth(),strFromDt.getDate(),FromHr,0);
var toDt= new
Date(strToDt.getFullYear(),strToDt.getMonth(),strToDt.getDate(),ToHr,0);
//alert(toDt + " " + fromDt);
//alert(FromHr + " " +ToHr);
var HolidayBlock=(parseInt(frm.cboHolidayHours.value) * 360 * 10000)
;
//alert((toDt-fromDt) + " " + HolidayBlock );
if((toDt-fromDt)== HolidayBlock)//14400000)
return true;
else
{
alert("Please select "+ parseInt(frm.cboHolidayHours.value) +" Hour
Block only for Holiday!");
frm.txtLimitFrom.focus();
return false;
}
}
return true;
}
</script>
- 13
- Java installationTry to install Java on my computer, but Microsoft tells me:
THE JAVA RUNTIME ENVIRONEMENT CANNOT BE LOADED FROM <bin\hotspot\jvm.dll
What am I doing wrong to install that applet
please reactions
Robert
- 14
- Telephonic CredentialsI think it would be nice if I could prove to someone on the other end
of the phone I am me, and demand they prove they are who they claim to
be.
It could be done by letting a modem kick in for a second to exchange
challenge phrases to be encrypted by identification certificate that
might include name, address, phone number, expiry date, company.
Then if some charity I donate to phone me, I can be sure it is them.
There are so many scams out there.
It might also be done by each of us contacting an Internet server.
Has anyone heard of such projects?
--
Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com
- 14
- Newbie question - reading delimited files and printing...Reading files - pipe delimited or comma delimeted...
Searching for a element in one field and then showing certain fields where
element is in line.
eg...
HEHE|HI|ME|2.5
JOKE|HELLO|YOU|3.4
DONT|HI|YOU|3.4
I want all rows with YOU in second column and I want to print out 2nd and
4th columns.
SO, my answer would be
HI 2.5
HI 3.4
...
Next question...
same list only a datestamp on the end...
HEHE|HI|ME|2.5|20031223091234
JOKE|HELLO|YOU|3.4|20031223091245
DONT|HI|YOU|3.4|20031223091247
....
1) I want all rows with YOU in second column and I want to print out 2nd and
4th columns in the 09:00:00 - 09:59:59 time frame.
2) I want an average of response time(4th field).
3) I want an average of response time broken down by hour.
Can someone help with all of this?
Please email to my home email (feel free to copy here).
email***@***.com
take out the _no_spam_
Thanks,
Markis
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| Author |
Message |
Knute Johnson
|
 Posted: 2007-12-21 13:58:00 |
Top |
java-programmer, Animation Problem
Lew wrote:
> James Sarjeant wrote:
>> Thank you so much everyone, it worked with the javax.swing.Timer events.
>> Still got other bugs to iron out but thats a huge hurdle overcome.
>> Thanks again
>
> Remember: you think you have gotten away from the advice about the EDT,
> but you haven't.
>
It's a pesky thing isn't it :-).
--
Knute Johnson
email s/nospam/knute/
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Knute Johnson
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| Posted: 2007-12-21 13:58:00 |
Top |
java-programmer >> Animation Problem
Lew wrote:
> James Sarjeant wrote:
>> Thank you so much everyone, it worked with the javax.swing.Timer events.
>> Still got other bugs to iron out but thats a huge hurdle overcome.
>> Thanks again
>
> Remember: you think you have gotten away from the advice about the EDT,
> but you haven't.
>
It's a pesky thing isn't it :-).
--
Knute Johnson
email s/nospam/knute/
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rossum
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| Posted: 2007-12-21 17:44:00 |
Top |
java-programmer >> Animation Problem
On Thu, 20 Dec 2007 11:10:10 GMT, "James Sarjeant"
<email***@***.com> wrote:
>The scrollForward works fine but as soon as it is run in a loop it works but
>doesnt show the images. Any ideas are welcome.
Have you tried repaint() to get the screen to refresh?
rossum
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James Sarjeant
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| Posted: 2007-12-21 19:37:00 |
Top |
java-programmer >> Animation Problem
> > Remember: you think you have gotten away from the advice about the EDT,
> > but you haven't.
> >
>
> It's a pesky thing isn't it :-).
I never think I have escaped anything with Java. When they teach it in uni
or schools it always sounds so simple but it never is.
Thanks for the heads up about the EDT though. I think this application will
have many periods with that rearing its head
James
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James Sarjeant
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| Posted: 2007-12-21 19:40:00 |
Top |
java-programmer >> Animation Problem
Hi Rossum,
I did try repaint but that didnt have any effect whatsoever. The thread on
c.l.j.programmer helped me out. It was due to a thread issuse and doing too
many things at once.
Cheers anyway
"rossum" <email***@***.com> wrote in message
news:email***@***.com...
> On Thu, 20 Dec 2007 11:10:10 GMT, "James Sarjeant"
> <email***@***.com> wrote:
>
> >The scrollForward works fine but as soon as it is run in a loop it works
but
> >doesnt show the images. Any ideas are welcome.
> Have you tried repaint() to get the screen to refresh?
>
> rossum
>
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Lew
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| Posted: 2007-12-21 23:55:00 |
Top |
java-programmer >> Animation Problem
James Sarjeant wrote:
> Hi Rossum,
> I did try repaint but that didnt have any effect whatsoever. The thread on
> c.l.j.programmer helped me out. It was due to a thread issuse and doing too
> many things at once.
> Cheers anyway
>
>
> "rossum" <email***@***.com> wrote in message
> news:email***@***.com...
>> On Thu, 20 Dec 2007 11:10:10 GMT, "James Sarjeant"
>> <email***@***.com> wrote:
>>
>>> The scrollForward works fine but as soon as it is run in a loop it works
> but
>>> doesnt show the images. Any ideas are welcome.
>> Have you tried repaint() to get the screen to refresh?
If you have started multiple threads in different newsgroups on the same
question, it is only courteous to combine them with your answers in order to
correct the negative effects of multi-posting.
--
Lew
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Index ‹ java-programmer |
- Next
- 1
- stupid genericsWhen I first heard about generics I was excited. A great idea finally
available in Java. But the way they are implemented really makes no sense.
Because of type erasure generics do nothing that 1.4 code didn't already do
by using Object as "generic" class for all (sub)classes.
And the problem with arrays of generic classes? Simply ridiculous. There
is no sane reason why the following code (from a self-learning chess
program I've been working on) should not work, and yet...
ArrayList<Piece>[] board;
board = new ArrayList<Piece>[8]; // error: cannot create a generic
// array of ArrayList<Piece>
board[0] = new ArrayList<Piece>();
board[0].add(0, new Rook(false, 0, 8));
where of course Rook is a subclass of Piece.
I'm forced to use board = new ArrayList[8]; which of course gives an
unchecked warning.
They should just throw away the whole generics thing and replace it with a
C++ like approach.
- 2
- writing email attachment file to diskI'm trying to capture an email attachment and write it to disk.
I've coded the following lines in my attempt. The program seems
to run and creates the local file alex99.pdf. However, when I
tried to open it, it says it's corrupted and/or wasn't properly
decoded. Any ideas?
Properties props = new Properties();
Session session = Session.getDefaultInstance(props, null);
Store store = session.getStore("pop3");
store.connect(host, username, password);
Folder folder = store.getFolder("inbox");
folder.open(Folder.READ_ONLY);
Message message[] = folder.getMessages();
for (int i = 0, n = message.length; i < n; i++) {
System.out.println(i + ": " + message[i].getFrom() + "\t"
+ message[i].getSubject());
Object obj = message[i].getContent();
if (obj instanceof String) {
System.out.println(">>>plain text");
} else if (obj instanceof Multipart) {
System.out.println("Multipart");
Multipart mp = (Multipart) obj;
System.out.println("mp count = " + mp.getCount());
for (int j = 0, nn = mp.getCount(); j < nn; j++) {
Part part = mp.getBodyPart(j);
String disposition = part.getDisposition();
if ((disposition != null)&& ((disposition.equals(Part.ATTACHMENT) ||
(disposition.equals(Part.INLINE))))) {
System.out.println("attachment");
FileOutputStream fos = new FileOutputStream("alex99.pdf");
part.writeTo(fos);
} else if (disposition==null) {
MimeBodyPart mbp = (MimeBodyPart)part;
if (mbp.isMimeType("text/plain")) {
System.out.println("text/plain");
} else {
System.out.println("other mime type");
}................................
- 3
- 4
- Hot-deployment of EAR/JAR files using classloaders (on JBoss app server)Hi,
I am trying the following scenario:
- I deploy an app.ear into the jboss server.
- app.ear invokes a session bean deployed separately (sessionbean.jar)
- everything works fine
- I modify sessionbean.jar
- I redeploy it without restarting the server (hot deployment)
When app.ear invokes the sessionbean, it refers to the previous instance of
the sessionbean. And because I have replaced it, it does not find the
class...
Then I read on, and I find that if you write custom class loaders, you can
load new versions of classes on the fly (dynamic loading).
So I wrote a custom class loader, which works fine when I call a basic java
library, but there does not seem to be a way of 'redeploying' this
sessionbean.jar as a bean (you can't invoke it anymore with the home/remote
interface)....
Can someone help me here ? I am basically trying to redeploy beans without
redeploying the app server and having them immediately rebind to whichever
application needs to use them.
Thanks
Steph
- 5
- Choosing elements to display in a JSP using StrutsHello,
I am very new to everything web development, so please bear with me.
My development environment is:
Win2k
Tomcat 4.0.30
Apache 2.0.48
mod_jk/2.0.4
j2sdk 1.4.2
Struts 1.1
mysql 4.0.18
I am using Struts to develop my webapp in an MVC fashion. I am using
forms based authentication to a mysql database.
Using the tools in my development environment, I am wondering if it is
possible to choose the elements displayed in a JSP based on the group
the user is in (and still stay withing the MVC framework), or if that
is even the right approach. I prefer to not show options to users if
they do not have permissions to perform them.
Any suggestions or advice would be great. If you know of any
tutorials/books/web resources that you could point me to, that would
be fantastic as well.
Thanks in advance.
Randy
- 6
- Changing log level at runtimeYou know the situation: logging output is useless .. until you need it.
Is there a way to configure log4j in a web application or an EJB with
log level ERROR and have it change to DEBUG whenever an error happens?
The only thing I can imagine is having a special servlet that you have
to call with the browser to have it trigger a log level change for the
whole web application.
Are there better ways? Maybe with the jdk built-in logger?
Or with log4j JMX? But I could not find any docs or examples.
Thx,
Juergen
- 7
- hide NullPointerExceptionI have a GUI which throws a nullpointerexception when things go wrong.
Then it closes. That nullpointerexception is expected and I want it
ignored since before that it has already informed the user that
something has gone wrong and its closing. How can I do this? If I just
put the part of the function throwing the exception within try/catch,
it tends to hang. If I leave it as is, it throws the exception but
closes fine. I just don't want the user to see that exception.
- 8
- poster or wallpaperHi all
I need posters or wallpapers which is about programming and computer
science, for hanging
thanks
- 9
- Override prepareRenderer()I've gathered that in order to change the background color of a row,
one can either use the tablecellrenderer or can override the
prepareRenderer() method. I have chosen to override the
prepareRenderer() method. My question (and a reather silly one) is
exactly how to call this method to then color your rows.
I already have a jtable with is autogenerated by netbeans and all of
the code I've seen, the jtable is created programmatically.
Here is what I TRIED to do (any help is greatly appreciated):
public void updateGUI(String newValue){
DefaultTableModel errorTableModel = (DefaultTableModel)
parentScreen.jTableErrors.getModel();
int numRows = errorTableModel.getRowCount();
numRows++;
errorTableModel.setRowCount(numRows);
parentScreen.jTableErrors.setModel(errorTableModel);
Object newObjectError = (Object) newValue;
parentScreen.jTableErrors.setValueAt(newObjectError, numRows - 1, 0);
JTable coloredTable = new JTable( errorTableModel )
{
public Component prepareRenderer(
TableCellRenderer renderer, int row, int column)
{
Component c = super.prepareRenderer(renderer, row, column);
String message = (String) getValueAt(row, column);
String[] dividedMsg = message.split(":");
if(dividedMsg[0].equals("Error: ")){
this.setBackground(Color.RED);
}
else{
this.setBackground(Color.YELLOW);
}
return c;
}
};
parentScreen.jTableErrors = coloredTable;
}
- 10
- reinventing the wheelhttp://www.ted.com/index.php/talks/view/id/162
This is off topic, but Java folk will like find it amusing. It shows
a Dutch invention to replace the wheel, various mechanical walking
machines. It has a mechanical step counter, a sort of primitive finite
state automaton..
--
Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com
- 11
- Q: Possible to auto-fallback back to MS JVM from Sun JVM ?Hi all.
Ok, so it's no secret, MS can no longer distribute its Java VM with
its OS'.
Naturally, that didn't stop me from installing an old one so
WindowsUpdate would see it and upgrade it to the last (MS) build:
5.00.3810
I also installed the latest SUN Java VM (1.4.2_03)
*** Flash ***
Woaaaah!! Just saw their "Law & Order" game
(http://java.com/en/index.jsp)
Gotta try that!
*** End Flash ***
So what I want in fact, is to use SUN's VM as default, but to
automatically switch back to MS' VM for those sites that still use it
(for example, my bank still uses it, so I can't issue payments if Sun
is default -- annoying).
Of course, this can be done manually in "Set Program Access and
Defaults" in hte Window scontrol panel, but you have to select one or
the other.
Same with Sun's Java Plug-in control panel (Advanced tab).
So... is there a way to perform an auto-fall-back to MS JVM when an
applet cannot load/initialise with the Sun JVM ?
Or create a list of site which must use MS instead of Sun?
Any help appreciated.
M.T.
- 12
- please explain this simple constructmy instructor likes to use this construct in class but never really
explained why/how it works:
while (true)
{
if (something) return; // break from while
}
can someone shed some light how this works?
- 13
- Problem starting out with Java . . .Hey. Im new to Java, and am having a prroblem with the netbeans IDE.
every time i try to import java.awt.* , I can't use any of the
methods(like they don't exist). I can compile it fine, but when I try to
run it, I get "exception in class main".
Can anyone help me, please?
- 14
- hi friends.please helpI am trying t make a jTable Using Abstract TableModel. But my JTable
doesnot appear on the frame.I have written two classes myTable and
jTable2 .My code is given below:
import javax.swing.*;
import java.awt.*;
public class myTable {
public static void main(String args[]){
JTable2 tbl2=new JTable2();
JTable aTbl=new JTable(tbl2);
aTbl.updateUI();
aTbl.setVisible(true);
JFrame frame=new JFrame("Jtable using AbstractTableModel");
JPanel pan=new JPanel();
JScrollPane scp=new JScrollPane();
scp.add(aTbl);
pan.add(scp);
frame.getContentPane().add(pan);
frame.setVisible(true);
frame.pack();
}
}
import javax.swing.*;
import java.sql.*;
import java.util.*;
import javax.swing.table.*;
public class JTable2 extends AbstractTableModel{
Connection con;
Statement stmt;
ResultSet rs;
int columns;
Vector allRows;
Vector row=new Vector();
String [] columnNames={"ID_CODE","NAME","SECTION"};
public JTable2(){
// connect to database
try{
db_connect();
getData();
}catch(Exception ex){
ex.printStackTrace();
}
}
void db_connect() throws SQLException{
try{
Class.forName("oracle.jdbc.driver.OracleDriver");
con=DriverManager.getConnection("jdbc:oracle:thin:@158.144.71.242:1521:dbadp","payroll","sush");
System.out.println("Connected");
}catch(Exception ex){
ex.printStackTrace();
}
}
void getData() throws SQLException {
try{
stmt=con.createStatement();
rs=stmt.executeQuery("select idcode,id_name,sec_code from
employee");
ResultSetMetaData rsMetaData=rs.getMetaData();
columns=rsMetaData.getColumnCount();
allRows=new Vector();
while(rs.next()){
Vector newRow=new Vector();
for(int i=1;i<=columns;i++){
newRow.addElement(rs.getObject(i));
}
allRows.addElement(newRow);
}
}catch (Exception ex){
ex.printStackTrace();
}
}
public int getRowCount(){
return allRows.size();
}
public int getColumnCount(){
return columns;
}
public Object getValueAt(int aRow,int aColumn){
row=(Vector) allRows.elementAt(aRow);
return row.elementAt(aColumn);
}
public boolean isCellEditable(int row, int col){
return false;
}
}
- 15
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