| Java - Awareness of other programs installed on PC |
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- 2
- Dual JTree interaction
Hi guys
I have 2 jTree controls on a jFrame ,
And when I try to make the second jTree to react on the first jTree clicks ,
What is the correct OOP way to do it ?
- 3
- java does not runThis is a multi-part message in MIME format.
Hi folks,
Downloaded the latest XP updates and the java stopped working(?) When I load a page with j.s. it doesn't run ie menumachine shows up in the source code but my computer does not display it.
IE.>tools>internet options>advanced and Java Console enabled and JIT compiler for virtual machine enabled
Any help would be appreciated.
Dave
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.2800.1276" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial>Hi folks,</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Downloaded the latest XP updates and the java stopped
working(?) When I load a page with j.s. it doesn't run ie menumachine shows
up in the source code but my computer does not display it. </FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>IE.>tools>internet options>advanced and Java
Console enabled and JIT compiler for virtual machine enabled</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Any help would be appreciated.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Dave</FONT></DIV></BODY></HTML>
- 4
- Outsourcing to India and Chinayeah there was a philosopher back in the 60s by the name of
thornkinson (god i hope that's right) but he went into detail on how
society will eventually solve all its problems through efficient
technology. he supposed built a vehicle that can do like 50mpg back
then.
the light bulb is an interesting question tho. its horribly
inefficient. hasn't changed since edison created it. its used by
literally everyone. you would think someone would realize the
potential in mass producing something better..
however i don't think its physically possible to heat a home using 3
lightbulbs. besides a lightbulb mostly creates heat.
Roedy Green <email***@***.com> wrote in message news:<email***@***.com>...
> On 8 Jan 2004 09:19:43 -0800, email***@***.com (Loco
> Pollo) wrote or quoted :
>
> >it would take 7 planet earths to support
> >everyone with this wasteful lifestyle because we are on the whole
> >inefficient with our resources.
>
> The problem is we have some habits left over from our cave man days
> documented by Thorsten Veblen in the Theory Of The Leisure Class (a
> very funny book published in 1899).
> http://www.amazon.com/exec/obidos/ASIN/0140187952/canadianmindprod
>
> We like to impress each other with conspicuous consumption and
> conspicuous waste.
>
> Somehow, we must come to equate status with efficient and parsimonious
> use of resources.
>
> I was horrified to learn that the technology to build a house in
> Canada that can be heated with a single light bulb costs only a few
> thousand dollars extra, yet almost no one takes advantage of it.
>
> Yet the houses built today will NEED that technology to be practical
> after the age of oil.
>
> We are like castaways on a desert island, deciding to have a feast on
> whatever washed ashore, before we have any plan to live off the land.
- 4
- Using Java with Dual & Quad Processors.I have a function which I call using for loop. I want that when My
Java program is run on Dual Core its speed increases by twice and when
it run on Quad core its speed increase 4 time.
Here is the Code I am using.
const NUMBER=1000;
Public int int_x;
Public int[] Array1= new int[NUMBER];
init (){
for (int i=0;i<NUMBER;i++){
function_abc(i);
}
}
// function_abc returns same value for a given Value of "i".
function_abc(int i){
int_x++;
...
...
...
Array1[i]=i*5+int_x;
}
So in the end we get an Array[i] with the formula values. On a single
processor it goes through all the for loop in NUMBER times.
I want on Dual Core the Performance doubles by using Threads. So
function_abc(i); is Called in multiple threads and Speed increases X
times depending on number of X Processors the System has.
How can it be done, any idea.
So for Single Core it will have no spped increase.
For Dual Core Twice Speed
For Quad Core 4 Times speed is seen.
Bye
Sanny
- 6
- tablet stylus as graphicI am wondering if there is a simple applet somewhere, which I could embed in
an html form, such that on a tablet pc, using the tablet's
stylus, sign in some field, that field then, rather than being converted to
text(as is typical in tablets) is then maintained as an image, then, the
form is posted to a mysql database where the image of the signature is
retained as such.
Does anyone know of such an animal, or even something remotely like this?
Thanks, Ike
- 6
- javadoc to ms word docAnyone got some tips to ease the conversion from javadoc to ms Word?
I've got the source code, I can produce html and yes ms word does understand
html, but its a laborious process with 50 files. And the html tables never
fit the width correctly.
Any tools to javadoc straight from source to ms .doc ?
TIA
--
Mike W
- 8
- [Struts] Init formbean value before Initialisation?Daniel Cloutier wrote:
> i've got 2 actions, 2 forms and 2 jsps... on jsp1 i receive userinput
> (e.g. the username) and i want to show it in the form on the next jsp
> (in a text-component). how can i accomplish this without scriptlets?
> can i access the second formbean in the action of the first jsp?
Please post some of your code. It's easier to talk about this using real
names of Action classes and Forms.
I'm guessing Action1 fortwards to JSP1 which has the username field (a
login form?) When you submit that, it goes back to Action1, which sees
that the value is present and forwards where?
--
Wendy in Chandler, AZ
"BTW, Lucifer just called and he needs a pair of ice skates :-)"
James Turner on struts-dev, voting to release Struts 1.1 Final
- 8
- i'm makin traxc!!!... got it in the box.
trying to use simpldateformatter but
can't find examples on the net.
... i don't understand what and where it returns its
output??? is there a variable return. the examples show no calls???
k
--
Sometimes I'm in a good mood.
Sometimes I'm in a bad mood.
When all my moods have cum to pass
i hope they bury me upside down
so the world can kiss me porcelain,
white, Irish bottom.
- 8
- Trying to put a background image in a JFrameTrying to put a background image in a JFrame
I have looked this issue up and found that extending JPanel and
specifying a paintComponent() is one possibility. I haven't tried this
yet (and a different task popped up for today).
However, I thought that using the JFrames JRootPane or JLayeredPane
could be less a hassle. Well, it's not really, but I'm curious if this
could be solved.
Get the whole NetBeans project with a compiled jar (49kB zip file) here
[1]. Please don't use the image for yourself, or my boss will kill me.
What happens is that the image (with transparent areas) is painted
infront of components instead of behind. Actually, when I first start
the application, the image is infront of one button and behind the
other. Moving the mouse over a button brings it to front, resizing the
window will put all components behind the image.
By the way, in the final project, the window will not be resizable,
although I would appreciate some hint towards catering for the image
being anchored to the lower right corner aswell.
[1] http://www.op3racional.eu/x/LayerTest.zip
--
Sabine Dinis Blochberger
Op3racional
www.op3racional.eu
- 9
- Help! Constructors not workingI'm doing an assignment for a Java class. Basically, we have to build
constructors for a class, Television, whose attributes are *brand* and
*price*. I have defined the constructors and accessor and mutator
methods in Television.java, and access it via TelevisionClient.java
(code for both is posted below). Both files compile. However when I
run TelevisionClient, it runs through the code, but my constructors,
tv0, which I assign a value in the program, and tv1, which is assigned
through dialog boxes at runtime, are the same value - in other words,
even assigning a value to one, they both have the values that are
passed in through the dialog box. I appreciate any help.
******* Television.java ****************
import java.util.*;
import javax.swing.JOptionPane;
import java.io.*;
public class Television
{
public static String brand;
public static String price;
public Television(String xbrand, String xprice)
{
brand = xbrand;
price = xprice;
}
public static String getBrand()
{
return brand;
}
public static String getPrice()
{
return price;
}
public String toString()
{
String str = "";
str = "Television information:\n"
+ "The brand name is " + this.brand + "\n"
+ "The price is: $" + price;
return str;
}
public boolean equals(Television tvx)
{
if (brand.equals(tvx.brand)
&& price==(tvx.price))
return true;
else
return false;
}
}
******* end Television.java ****************
******* TelevisionClient.java ****************
import javax.swing.JOptionPane;
public class TelevisionClient
{
public static String inputMessage;
public static String outputMessage;
public static String outputMessage2;
public static String outMsg;
Television tv0, tv1;
public void workWithTV( )
{
tv0 = new Television( "RCA", "100.00");
JOptionPane.showMessageDialog( null, tv0.toString( ) );
outputMessage = "This program will list the brand and price of a
television "
+ "based on the values you enter.\n"
+ "It will then compare the values to the default: RCA - $100.00\n";
JOptionPane.showMessageDialog(null, outputMessage,"Television
Attributes",
JOptionPane.PLAIN_MESSAGE);
inputMessage = "Enter the brand of the television:\n\n";
Television.brand = JOptionPane.showInputDialog(inputMessage);
inputMessage = "Enter the price of the television:\n\n";
Television.price = JOptionPane.showInputDialog(inputMessage);
// price = Double.parseDouble(price);
Television tv1 = new Television(Television.brand, Television.price);
outputMessage = tv1.toString();
JOptionPane.showMessageDialog(null, outputMessage,"Television
Attributes",
JOptionPane.PLAIN_MESSAGE);
JOptionPane.showMessageDialog( null, tv0.toString( ) );
JOptionPane.showMessageDialog( null, tv1.toString( ) );
outMsg = "tv0: " + tv0.brand + "/" + tv0.price + "\n"
+ "tv1: " + tv1.brand + "/" + tv1.price + "\n";
JOptionPane.showMessageDialog(null, outMsg,"Television Attributes",
JOptionPane.PLAIN_MESSAGE);
if ( tv1.equals( tv0 ) )
outputMessage2 = "DOES EQUAL";
else
outputMessage2 = "DOES NOT EQUAL";
outputMessage = "The values you entered, brand: " +
Television.getBrand() + " / price: $" + Television.getPrice() + "\n"
JOptionPane.showMessageDialog( null, outputMessage );
if ( tv1 == tv0 )
outputMessage2 = "DOES EQUAL";
else
outputMessage2 = "DOES NOT EQUAL";
outputMessage = "The values you entered, brand: " +
Television.getBrand() + " / price: $" + Television.getPrice() + "\n"
JOptionPane.showMessageDialog( null, outputMessage );
}
public static void main (String[] args)
{
TelevisionClient app = new TelevisionClient( );
app.workWithTV( );
}
}
******* end TelevisionClient.java ****************
- 11
- Polymorphism in JavaHi Friends,
Don't missout on these articles on design techniques:
Polymorphism in Java:
http://javalive.com/modules/articles/article.php?id=19
The Factory Design Pattern:
http://javalive.com/modules/articles/article.php?id=18
Effective use of Interfaces and Abstract Classes:
http://javalive.com/modules/articles/article.php?id=17
Why ORM Tools are not Recommended:
http://javalive.com/modules/articles/article.php?id=16
How to Estimate Project Deadlines:
http://javalive.com/modules/articles/article.php?id=14
Regards,
Vijay
- 11
- ｗhat is Xerces,XSLT,Crimson ?regards:
ｗhat is Xerces,XSLT,Crimson ?
How to use it? could someone good give me a hand @@.
Thank you.
May god be with you.
- 11
- measuring signal strength in javahello
i am writing a java program for locating a wireless device within an
office environment. i want to use the signal strengths of the
surrounding base stations (access points) to estimate the current
location of the device.
does anybody have an idea how to get the strength of a signal sent by
a base station in java?
thank you,
dominik
- 13
- escape meta for Pattern?On
http://java.sun.com/j2se/1.4.2/docs/api/java/util/regex/Pattern.html
it says:
> The string literal "\(hello\)" is illegal and leads to a compile-time error; in order to match the string (hello) the string literal "\\(hello\\)" must be used.
Now, if I read my input strings from a file I have to convert my
strings in order to match them against a pattern. How do I do that?
Is there a predefined method to do it? Like quotemeta in perl?
Thanks!
Markus
- 13
- HTTP Persistent connections on Apache web-serverHi,
I need to implement a solution which needs a HTTP persistent connection
from the client( any browser ) to the webserver ( Apache here )
This is how I am trying to acheive the persistent connection:
For every user logging on to the webserver, the browser sends a HTTP
request to the webserver which is being handled by a servlet on the
webserver. The servlet then creates a thread which holds the response
object and waits for some asynchronous data coming from a diff backend
sever.
As soon as some data is posted on to this thread, this thread sends
back the data to the clent on the response object that it has been
holding as a java-script object.
This thread is terminated only when the user logs out od the webserver.
Now, I have a few questions on this part:
1) I find that it is not an appropriate solution, given the fact that
the webserver needs to cater to 20-30k users at a time and creating a
thread per user on the webserver would really not solve the purpose. Am
I right ? ( The webserver would die is n't it?..)
2) Also, is there any limitation on the time that the thread can hold
the response object? like if the thread doesn't get any data posted on
to it from a diff backend sever, will the client( here IE or mozilla )
close the underlying socket connection ?
3)Any limitation on the scalability of this approach ( I want to know
to how many users will this approach solve )?
4) Now given my inner feeling that this approach won't work well, what
is the best way to implement a lonf-lived HTTP persistenet connection
from my browser to the webserver.
(Please note that the webserver need to push some asynchronous data to
the client as long as the user is logged on the webserver ..no refresh
mechanism please )
Apprecaite if reponded well!!!
Thanks in advance to ALL
"webdev50"
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| Author |
Message |
adeelmahmood
|
 Posted: 2007-2-14 6:10:00 |
Top |
java-programmer, Java - Awareness of other programs installed on PC
Is there way in JAVA to access information about the installed
programs on the PC. I mean somehow you could grab some information
about all items in (lets say for windows) the Start-Programs.
Thanks for ur help
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Andrew Thompson
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| Posted: 2007-2-14 6:39:00 |
Top |
java-programmer >> Java - Awareness of other programs installed on PC
On Feb 14, 9:10 am, "adeelmahmood" <email***@***.com> wrote:
> Is there way in JAVA to access information about the installed
> programs on the PC. I mean somehow you could grab some information
> about all items in (lets say for windows) the Start-Programs.
Why? What does this program give to the end user?
Andrew T.
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adeelmahmood
|
| Posted: 2007-2-14 6:42:00 |
Top |
java-programmer >> Java - Awareness of other programs installed on PC
On Feb 13, 4:38 pm, "Andrew Thompson" <email***@***.com> wrote:
> On Feb 14, 9:10 am, "adeelmahmood" <email***@***.com> wrote:
>
> > Is there way in JAVA to access information about the installed
> > programs on the PC. I mean somehow you could grab some information
> > about all items in (lets say for windows) the Start-Programs.
>
> Why? What does this program give to the end user?
>
> Andrew T.
well there are many possibilities .. thats not the point .. is it
possible and how ???
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Brandon McCombs
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| Posted: 2007-2-14 7:29:00 |
Top |
java-programmer >> Java - Awareness of other programs installed on PC
adeelmahmood wrote:
> On Feb 13, 4:38 pm, "Andrew Thompson" <email***@***.com> wrote:
>> On Feb 14, 9:10 am, "adeelmahmood" <email***@***.com> wrote:
>>
>>> Is there way in JAVA to access information about the installed
>>> programs on the PC. I mean somehow you could grab some information
>>> about all items in (lets say for windows) the Start-Programs.
>> Why? What does this program give to the end user?
>>
>> Andrew T.
>
> well there are many possibilities .. thats not the point .. is it
> possible and how ???
>
You'll have to forgive Andrew. He seems to avoid answering questions
asked by the poster and ask his own instead if he thinks his are more
relevant. Your reasons don't matter to me but they seem to matter to
him. Until it is determined that it matters to help you with your
problem it's really none of my business *why* you want to do something.
Anyway, in the specific case of Start menu entries, these entries are
shortcuts that exist as files (like any other Windows shortcut) in a
User's profile directory. Each user has a Start Menu folder that
contains programs that were installed only for them (most apps are
installed under the All Users profile). So you could just use Java to
look at a user's start menu entries by looking at the Start Menu folder
for that user. If you need anything else like accessing the Windows
registry through Java I can't help you. I seem to recall looking for
something like that a few weeks ago and I think I found some libraries
that could do that but they weren't free.
hope that helps
Brandon
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Arne Vajh鴍
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| Posted: 2007-2-14 7:56:00 |
Top |
java-programmer >> Java - Awareness of other programs installed on PC
adeelmahmood wrote:
> Is there way in JAVA to access information about the installed
> programs on the PC. I mean somehow you could grab some information
> about all items in (lets say for windows) the Start-Programs.
To access the Windows registry you will need JNI.
You can find the items in the start menu by just
listing files and directories, but if you need to
read the content of the .lnk files I believe you are
in unsupported land. There are probably some Win32 API
to access the info and this will also require
JNI.
I think the bottom line is that Java is not a god
choice for the task.
Arne
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Andrew Thompson
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| Posted: 2007-2-14 16:37:00 |
Top |
java-programmer >> Java - Awareness of other programs installed on PC
On Feb 14, 10:29 am, Brandon McCombs <email***@***.com> wrote:
> adeelmahmood wrote:
..
> You'll have to forgive Andrew.
The OP can do anything they like.
Andrew T.
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Alex Hunsley
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| Posted: 2007-2-14 18:29:00 |
Top |
java-programmer >> Java - Awareness of other programs installed on PC
Arne Vajh鴍 wrote:
> adeelmahmood wrote:
>> Is there way in JAVA to access information about the installed
>> programs on the PC. I mean somehow you could grab some information
>> about all items in (lets say for windows) the Start-Programs.
>
> To access the Windows registry you will need JNI.
He could always use System.execute() with some native commands for
accessing the registry etc. Doesn't sound very nice though.
>
> You can find the items in the start menu by just
> listing files and directories, but if you need to
> read the content of the .lnk files I believe you are
> in unsupported land. There are probably some Win32 API
> to access the info and this will also require
> JNI.
>
> I think the bottom line is that Java is not a god
> choice for the task.
Agreed....
(I had a giggle at 'god' choice btw! Started imaging Sun's other
products, e.g. Sun Jehova.)
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Chris Uppal
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| Posted: 2007-2-15 2:41:00 |
Top |
java-programmer >> Java - Awareness of other programs installed on PC
Brandon McCombs wrote:
> Anyway, in the specific case of Start menu entries, these entries are
> shortcuts that exist as files (like any other Windows shortcut) in a
> User's profile directory.
And elsewhere ('All users' as it's called on my Windows installation, though I
imagine that name varies with language).
And I wouldn't put it past MS to include "magic" entries in there too.
But that (even when generalised) doesn't sound very useful to me. The nearest
thing to a correct list of installed software in Windows is the one used by the
"Add/Remove programs" application. But even that isn't really correct (I have
many apps on this box which weren't "installed" in the normal sense -- Eclipse,
for one).
So, it really comes down to what the OP is /really/ trying to do. Which is
what Andew asked.
-- chris
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adeelmahmood
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| Posted: 2007-2-15 3:33:00 |
Top |
java-programmer >> Java - Awareness of other programs installed on PC
On Feb 14, 12:40 pm, "Chris Uppal" <email***@***.com
THIS.org> wrote:
> Brandon McCombs wrote:
> > Anyway, in the specific case of Start menu entries, these entries are
> > shortcuts that exist as files (like any other Windows shortcut) in a
> > User's profile directory.
>
> And elsewhere ('All users' as it's called on my Windows installation, though I
> imagine that name varies with language).
>
> And I wouldn't put it past MS to include "magic" entries in there too.
>
> But that (even when generalised) doesn't sound very useful to me. The nearest
> thing to a correct list of installed software in Windows is the one used by the
> "Add/Remove programs" application. But even that isn't really correct (I have
> many apps on this box which weren't "installed" in the normal sense -- Eclipse,
> for one).
>
> So, it really comes down to what the OP is /really/ trying to do. Which is
> what Andew asked.
>
> -- chris
well Thank you guys for all ur help .. to clear up all this mess ..
here is what I had in mind ..
I was thinking along the lines of having a Java program automate the
startup of other programs on ur PC ..using keywords .. kind of like
launchy http://www.launchy.net/ .. difference is that launchy is
written in C so it makes it a perfect candidate for windows stuff ..
what launchy does is that indexes the start up programs for u to
create a list of programs that u could start with some keyword
matching mechanism ..
I understand that for something like this java should not be the
choice especially since it defeats the whole platform-independant-
langauge concept. but I think this can be implemented in platform-
independant manner so I guess I am just gonna drop the idea of
indexing the Start menu or something like that ..
the simplest thing would be to just let the user specify the
executables and with the help of some pattern matching you can make it
easier for user to get to that program .. but automating things is
always better ..
so if u have any ideas regarding this stuff .. please share
Again thanks for your help ..
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Lew
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| Posted: 2007-2-15 4:13:00 |
Top |
java-programmer >> Java - Awareness of other programs installed on PC
Alex Hunsley wrote:
> (I had a giggle at 'god' choice btw! Started imaging Sun's other
> products, e.g. Sun Jehova.)
It would run on the Jehova Virtuous Machine.
- Lew
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Arne Vajh鴍
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| Posted: 2007-2-15 8:01:00 |
Top |
java-programmer >> Java - Awareness of other programs installed on PC
Alex Hunsley wrote:
> Arne Vajh鴍 wrote:
>> I think the bottom line is that Java is not a god
>> choice for the task.
>
> Agreed....
> (I had a giggle at 'god' choice btw! Started imaging Sun's other
> products, e.g. Sun Jehova.)
Absolutely unintentional. I just missed an 'o'.
:-)
Arne
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Alex Hunsley
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| Posted: 2007-2-15 8:58:00 |
Top |
java-programmer >> Java - Awareness of other programs installed on PC
Lew wrote:
> Alex Hunsley wrote:
>> (I had a giggle at 'god' choice btw! Started imaging Sun's other
>> products, e.g. Sun Jehova.)
>
> It would run on the Jehova Virtuous Machine.
:)
>
> - Lew
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Index ‹ java-programmer |
- Next
- 1
- Reading from URLConnection stops at JavaScript alert callHi all,
when I post form content to a server (HTTPS protocol) using a
URLConnection and then reading the servers response using a
BufferedReader, the reader seems to stop just before reading the code
for a JavaScript alert. The code for reading the response looks like
this:
in = new BufferedReader(
new InputStreamReader(connection.getInputStream()));
stbResult = new StringBuffer(5000);
while ((sResult = in.readLine()) != null) {
stbResult.append(sResult);
}
When accessing the same site with a browser a dialog pops up at the
crucial point. After clicking away the alert the rest of the HTML page
gets loaded by the browser.
When looking at the code of the HTML page later on, I can see that the
response read by my java app ended just before the JavaScript code:
<SCRIPT LANGUAGE="JavaScript">alert("xyz");</SCRIPT>
I need to read in the whole page including the alert message. How can
I get my java app to read in the JavaScript code within the HTML page
(no problem occured with the JavaScript code in the header) and the
remaining HTML code?
Thanks for thinking about this one!
Ralf
- 2
- A question about Java ThreadI see a code like this:
in a Thread:
--------------------------
public void run() {
Thread currentThread = Thread.currentThread();
while (thread == currentThread) {
try {
repaint();
thread.sleep(100);
}
catch (InterruptedException ex) {
}
}
}
---------------------------
what's the "while (thread == currentThread) " codes mean?
what is it used for?
Thank you in advance.
- 3
- edit jtable with enteri am having a problem with jtable which i was unable to solve for a
last couple a days. i think there needs to be much more docs on some
tricky uses of jtable than basic JTable/TableModel usage. so far i
managed to move to the next cell when i press enter (right hand side,
instead of moving down).
i'd like to start editing in the next cell after moving from previous
cell. so, if i was in editing mode in some cell, enter should bring me
to the next cell with caret blinking in it. of course, if i wasn't
editing some cell i don't want to edit next cell.
basicly, i want to make "row edit session", for example user starts
editing a cell with f2, and as long as he press enter he edits next
cell, until he reaches the end of the row and then changes are
commited to database, just like M$Access and SQLserver does. i think i
can do this myself, all i need is little help to start edit next cell
if user moves from previous cell. i checked BasicTableUI source, and
as i see i should get the editor component and request focus on it.
but i am stuck with that.
thanks!
- 4
- Porting C++ Template to Java GenericI've run into a road block with porting some C++ code that makes use
of templates to Java. In it, there is a main class I'll call A that
is a template class:
// C++
template <class T> class A
public:
virtual T Evaluate() const = 0;
};
Other classes extend this class:
// C++
template <class T> class B : public A<T> {
public:
B(const T &v) { value = v; }
T Evaluate() const { return value; }
private:
T value;
};
Now all of this is easy to implement in Java using Generic
programing. The issue I'm having is when I try to implement code like
this:
template <class T1, class T2> class C : public A<T2> {
public:
C(A<T1> a, A<T2> b) { t1 = a; t2 = b; }
T2 Evaluate() {
return t1->Evaluate() * t2->Evaluate();
}
private:
A<T1> t1;
A<T2> t2;
};
Java complains about about the * operator being undefined for
arguments T1, T2; Since Java doesn't have operator overloading, I
can't really see how to implement the same functionality. Has anyone
ever encountered this type of problem, or can anyone see a way around
this issue?
- 5
- processMouseEvent()
MouseDown() and MouseUp() are deprecated; both have been replaced by
processMouseEvent()... how can this be? (two diff. methods replaced by
same method..)
http://java.sun.com/j2se/1.5.0/docs/api/java/awt/Component.html#mouseDown(java.awt.Event,%20int,%20int)
thank you..
Frances
- 6
- new version of Open Content Software Design web bookI have an updated version of my Software Design web
book (free!) that is primarily Java centric. This
web book is not as complete as my "Java AI" and "Introduction
to Common LISP" web books, but it is hopefully in a usable
state as-is. I am especially looking for feedback
on how to improve it (the Common LISP community was
awesome in providing great feedback for the free LISP
book - can the Java community do the same :-)
Help yourself (on the 'Free Web Books" page):
http://www.markwatson.com
-Mark
- 7
- 8
- policy file in eclipse.Hello.
How can I declare in Eclipse the policy file (like policy.all : I don't know
if that's matter, but I have version 3.3) ?
Thanks :)
- 9
- jsp - fetching fresh inserted data - reload issue?hi ng,
i have a form, where a user can input some data.
after pressing submit, the controller.jsp makes some
validations and shall list up this new entry.
in short, my problem is, that this newest entry is
not shown - but is correctly inserted into the db.
+ form.jsp : holds the form
+ controller.jsp : inserts form data into db,
and queries the db to show the newest entry.
after refreshing the site by hand, the newest entry
is listed, BUT also in the db (duplicate in db!).
i tried some java script solutions, top.mainFrame.location.reload()
and adding some META-TAG in the HEAD-Tag of HTML, but no
effects...
feedback is appreciated, thanks in advance.
with regards,
jonas
- 10
- Beginner, this will be a quick fix, so please check it out!!Hi, extreme noob here (less than one week of Java exerience, or any
programming exp)
This program i am writing from a book is suppose to ask the question
"How many gumballs? How mand kids? " , and then allow the user to
input the 2 answers. for example : 80 4
but it doesn't ask that question, it just answers without asking! any
help... ? this is from the Beginner Programming with Java for Dummies
- 2nd Edition. I typed it straight out of the book, and checked it
vary carefully. the output im currently gettins is... "Each kid gets 6
gumballs"
import java.util.Scanner;
class KeepingMoreKidsQuiet {
public static void main(String args[]) {
Scanner myScanner = new Scanner(System.in);
int gumballs;
int kids;
int gumballsPerKid;
System.out.print("How many gumballs? How many kids? ");
gumballs = myScanner.nextInt();
kids = myScanner.nextInt();
gumballsPerKid = gumballs / kids;
System.out.print("Each kid gets ");
System.out.print(gumballsPerKid);
System.out.println(" gumballs.");
}
}
- 11
- reflect fieldHi all,
I want to get value of string variable in a class, and field it with
new strings like this :
EXample
public class helloWold()
{
String myString1 = "test1";
String myString2 = "test2";
String myString3 = "test3";
String myString4 = "test4";
}
public static void main(String[] args) {
Field myField[] = helloWold().class.getFields();
for (int i = 0; i < myField.length; i++)
{
System.out.println(myField[i].getName()); //get value
}
}
Actually I get the value, but i didn't know how to field it. I try the
method set but i have an error
'an not set java.lang.String field to java.lang.String'
Any ideas
Thanks.
Merci d avoir lu et de vos idees par avance
- 12
- 13
- Log4J problemHi everyone,
Consider the following piece of code:
Logger mylogger = Logger.getLogger(Log4JFileDeletionTest.class);
public Log4JFileDeletionTest() throws Exception
{
FileAppender fapp = new FileAppender(new
XMLLayout(),"/tmp/Log4JFileDeletionTest.log",true);
mylogger.setLevel(Level.DEBUG);
mylogger.addAppender(fapp);
mylogger.info("This is a test log");
Thread.sleep(7000);
mylogger.info("This is after deleting the file");
}
If during the Sleep(), I delete the log file, then none of the
subsequent log statements re-create the file. It remains deleted, no
exceptions get thrown and all the logs are lost.
Is there any solution to this, other than modifying the log4J code ?
Thanks in advance.
- 14
- Announce: A new open source O/R mapping toolAnnounce:
Molly DBO: A new open-source O/R mapping tool is out.
There are many such programs out there. But this one is very
special because it's simple (no xml configuration, yay !) and has
been tested with postgres and mysql. This tool has been used
extensively in production enviroments so the generated code has
most bugs squeezed out by now.
You can check it out at:
http://www.mollypages.org/dbo/
- 15
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