| Is the design of 'ArrayList' good ? |
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Index ‹ java-programmer
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- 1
- Error Code / Number ?Hi Group
is there any way to get the Error Code or Number related to the error ?
(Say within catch bolck)
Is java support that type of thing ?
What can i get from hashCode ?
Dishan
- 1
- Optional EJB2.x CMP many-to-one relationhipsIf I'm creating a CMP many-to-one relationship for an entity bean and that
link is optional, if the link is not active must I set a null value into
the field representing the many end of the relationhip?
For example, I have an Address entity bean that includes an integer
'RegionID' field. This field value is optional. I want to create a
relationship field that allows the Region entity to be accessed from the
Address entity. As the address to region many-to-one link is optional must
I set the default value of RegionID to be null?
- 1
- remote JBoss on local consoleI'm using Eclipse 3.0 IDE and JBoss 3.2.3 app server for building and
deploying EJB's. The Problem is that JBoss is on another PC and when I
deploy my bean the eclipse console shows only that my jar file is
copied to the server directory.
no debug , no error messages ...
so my question is how to make server debugging shows up on my eclipse
console
- 1
- linux-sun-jdk15 or jdk15 on 5.3R-p2Hello,
I am another user who is not able to get linux-sun-jdk15=20
working on a 5.3-R machine. Truss shows:
linux_mkdir(0x805cba8,0x1ed) ERR#17 'File exists'
linux_lstat64(0x805cba8,0xbfbfc740,0xbfbfc898) =3D 0 (0x0)
linux_open("/tmp/hsperfdata_root/77570",0x242,0600) =3D 3 (0x3)
oftruncate(0x3,0x8000) =3D 0 (0x0)
linux_mmap(0xbfbfc8d0) =3D 681074688 =
(0x28986000)
close(3) =3D 0 (0x0)
#224() ERR#78 'Function not =
implemented'
SIGNAL 12 (SIGSYS)
SIGNAL 12 (SIGSYS)
Process stopped because of: 16
process exit, rval =3D 140
Bad system call
Is there a timetable on native support for 1.5 or=20
fixture of the linux-sun-jdk15 port? Should someone=20
mark the port as broken or remove it? It sounds like=20
it does not work on 4.x or 5.x at all.=20
-Will
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To unsubscribe, send any mail to "email***@***.com"
- 2
- animation in custom table cell rendererDoes anybody know how to make animated gifs work in cell renderer?
I'm trying to use JLabel as base component with animated gif as image.
It works perfectly anywere except JTable...
- 3
- xerces parseri have slight problem:
i downloaded the xerces xml-parser and want to use the DOMParser class:
import org.apache.xerces.parsers.DOMParser;
later in code:
DOMParser parser = new DOMParser();
this class resides in a jar-file which i put in my classpath
(/dir/xalan-j_2_6_0/xercesImpl.jar)
jar -tvf reveals the DOMParser class is there, but the compiler says it
can't resolve the symbol.
Is this because you can't access this class directly anymore?
Should i use JAXP, to access it?
anybody an idea?
tx
- 3
- Java Hotspot VM Client 1.4.2.xxxx ???hi,
i've installed JDK 1.4.2, then I installed netbeans 5.0, and have
netbeans use this JDK version (I've uninstalled previous JDK versions
installed on my machine prior to installing 1.4.2). now, netbeans says:
"broken platform 'Java_Hotspot_TM__Client_VM_1.4.2_08-b03'...
From Sun's site, Java Hotspot is included in JDK 1.4.2, but where can
I find the jar file for it (i don't even know the name of the jar
file)?
your help is appreciated.
crash.test.dummy
- 6
- Problems Skewing Image (Trapezoid) with Graphics2Dhello!
right now i am working on a graphical output for a video projector. the
projection will be thrown on the wall from a little off center, so that i
will get the picture as a vertical trapezoid (the projectors i am using are
only able to correct horizontal trapezoids). my java program will have to
correct the effect. therefore i need to transform my graphics2d buffered
image NOT shearing the image, but genuinly skewing the image (that is two
parallel sides and two non parallel ones), as it would probably be possible
in java3d with the tilting of a plane.
how is it possible to skew rectangles with graphics2d?
thanks in advance!
roland
- 6
- Certificate was issued by an unrecognized entityI have problems running my application on the Samsung phones (SGH-E720,
SHG-E300) for HTTPS connection to server, I got next error on mobile
phone:
"Certificate was issued by an unrecognized entity Certificate:C=US;
O=VeriSign, Inc;OU=Class 3 Public Primary Certification Authority"
I checked certificates on both side: server certificate is present on
mobile phone, but still I got errors.
OU = Class 3 Public Primary Certification Authority
O = VeriSign, Inc.
C = US
Serial: 70 ba e4 1d 10 d9 29 34 b6 38 ca 7b 03 cc ba bf
Valid from Monday, 29. January 1996
Valid to Wednesday, 2. August 2028
Also, I have problems to install new certificates on mobile phone (I
tried via Bluetooth, WAP push, but mobile phone doesn't recognize that
it's a certificate and he can't handle this file.
BTW, same application is working properly on other vendor's phones
(Siemens, Motorola, Nokia,..)
Did somebody have similar problems and find some solution ?
Thanks in advance
- 9
- Ug. what is wrong with this classloader???Hi, I keep getting the following error:
java.lang.NoClassDefFoundError: com/mydomain/tst/TestClass (wrong name:
com/mydomain/tst/TestClass)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:502)
at java.lang.ClassLoader.defineClass(ClassLoader.java:431)
at com.mydomain.loader.TNTClassLoader.findClass(TNTClassLoader.java:194)
at com.mydomain.loader.TNTClassLoader.loadClass(TNTClassLoader.java:115)
at com.mydomain.loader.TNTClassLoader.loadClass(TNTClassLoader.java:104)
at java.lang.ClassLoader.loadClass(ClassLoader.java:255)
at com.mydomain.prm.bo.Test.redirectCheck(Unknown Source)
... 40 more
What causes this? Here is my code: (Search for the 'Chokes here') Note: I
am running under java 1.4
======================================================
package com.mydomain.loader;
import com.mydomain.rmi.*;
import com.mydomain.util.*;
import com.mydomain.exceptions.*;
import java.util.*;
import java.io.*;
import java.net.*;
/**
* Used to load TNT classes. TNT classes start with com.mydomain. There will
be
* one class loader for each environment file.
*
* @author Troy
* @version $Revision$
*/
public class TNTClassLoader extends ClassLoader {
private Context _context;
private ClassLoader _common;
private String _product;
private String _version;
private String _classKey;
private TNTClassLoader(Context context, ClassLoader common) {
super(common);
_context = context;
_common = common;
InsensitiveProperties p = _context.getEnvironment();
_product = p.getProperty("product");
_version = p.getProperty("version");
_classKey = _product + _version;
_classKey = _classKey.toLowerCase().trim();
} // constructor
protected synchronized Class loadClass(String name, boolean resolve)
throws java.lang.ClassNotFoundException {
boolean useTNTLoader = true;
String product = null;
if (name.startsWith("com.mydomain.")) {
int lastDot = name.lastIndexOf(".");
// should always be greater than 12 unless the package name is
'com.mydomain'
if (lastDot > 12) {
// match the product name to the product field in the
environment field
product = name.substring(13, lastDot);
} // end if
// ignore core packages
if (product == null ||
StrU.inStr(1,"/util/data/rmi/loader/","/"+product+"/") != 0) {
useTNTLoader = false;
} // end if
} else {
useTNTLoader = false;
} // end if
// use the regular classloader
if (!useTNTLoader) {
System.out.println("using parent classloader");
Class c = _common.loadClass(name);
if (resolve) {
resolveClass(c);
} // end if
return c;
} // end if
// match the product name to the product field in the environment
field
if (_product == null) {
throw new ClassNotFoundException("environment: " +
_context.getEnvironmentName() +
" does not define the product
field.");
} // end if
// make sure we are using the correct classloader
if (!product.equalsIgnoreCase(_product)) {
// the product doesn't match. we need a different classloader
// find the name of the actuall environment
InsensitiveProperties p = _context.getEnvironment();
String actualEnvironment = p.getProperty(product +
"Environment");
if (actualEnvironment == null) {
throw new java.lang.ClassNotFoundException(
"Actual environment could not be found, environment: " +
_context.getEnvironmentName() + ", product: " +
product);
} // end if
InsensitiveProperties pp =
_context.getEnvironment(actualEnvironment);
String checkProduct = pp.getProperty("product");
if (checkProduct == null) {
throw new ClassNotFoundException("environment: " +
actualEnvironment +
" does not define the
product field.");
} // end if
if (!checkProduct.equalsIgnoreCase(product)) {
throw new ClassNotFoundException("unable to find product -
environment: " +
_context.getEnvironmentName() +
", product: " + product);
} // end if
Context context;
context = (Context)_context.clone();
context.setEnvironmentName(actualEnvironment);
TNTClassLoader loader = getClassLoader(context, _common);
return loader.loadClass(name, resolve);
} // end if
/** @todo get class here */
System.out.println("using TNT classloader");
// First, check if the class has already been loaded
Class c = findLoadedClass0(name);
if (c == null) {
// If still not found, then call findClass in order
// to find the class.
c = findClass(name);
} // end if
if (resolve) {
resolveClass(c);
} // end if
return c;
} // loadClass
private Class findLoadedClass0(String name) {
// StaticClassCache is a synchronized cache
return StaticClassCache.getClass(_classKey,name);
} // findLoadedClass0
public static synchronized TNTClassLoader getClassLoader(Context
context, ClassLoader parent) {
String key = "System.classloader."+context.getEnvironmentName();
TNTClassLoader loader = (TNTClassLoader)StaticLoaderCache.get(key);
if (loader == null) {
loader = new TNTClassLoader(context,parent);
StaticLoaderCache.put(key,loader);
} // end if
return loader;
} // getClassLoader
protected Class findClass(String name) throws
java.lang.ClassNotFoundException {
String fileName = name.replace('.','/');
File file = new
File(_context.getLocation(),_product+_version+"/busobjs/"+fileName+".class")
;
System.out.println(file);
if (!file.exists()) {
throw new ClassNotFoundException(name);
} // end if
// Looking up the package
String packageName = null;
int pos = name.lastIndexOf('.');
if (pos != -1)
packageName = name.substring(0, pos);
Package pkg = null;
if (packageName != null) {
System.out.println("the package name is: "+packageName);
pkg = getPackage(packageName);
if (pkg == null) {
System.out.println("the package does not exist");
} else {
System.out.println("the package exists");
System.out.println(pkg.getImplementationTitle());
System.out.println(pkg.getImplementationVendor());
System.out.println(pkg.getImplementationVersion());
System.out.println(pkg.getName());
}
// Define the package (if null)
if (pkg == null) {
definePackage(packageName, "spectitle", "specversion",
"specvendor",
"impltitle", "implversion",
"implVendor", null);
} // end if
} // end if
byte[] buffer = new byte[8000];
try {
FileInputStream fis = new FileInputStream(file);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
BufferedOutputStream bos = new BufferedOutputStream(baos);
int result = 0;
while ((result = fis.read(buffer)) != -1) {
bos.write(buffer,0,result);
} //wend
fis.close();
bos.flush();
byte[] bytes = baos.toByteArray();
bos.close();
System.out.println("number of bytes in class is "+bytes.length);
System.out.println("trying to define class: "+name+"|");
Class c = defineClass(name, bytes, 0, bytes.length); //
<----Chokes here!!!!
System.out.println("class is defined!");
return c;
} catch (IOException ex) {
throw new ClassNotFoundException(ex.toString());
} // try
} // findClass
} // class
- 13
- 13
- Create new object the MenuItem is pressedHello,
I have develop an application, but I am having som problems what
eventshandling when a MenuItem in a Frame is pressed.
/*
menuFileUpdate.addActionListener(new Update());
*/
In this code the Update-object is created when the main-program i
initalized. This i a problem - I would like that the objekt is created at
"pressing time". Do anyone god any suggestion to how this i done?
The update-objekt i an class implementes Runnable. This class is af
singleton with a static instance. What I do right how is to test if the
static object i null, and if is I create a new one, and start the thread.
How ugly is it to set the static instance= null when the job is done - and
thereby create thread-objects if the getInstance() is called?
Do it give any proformace to run the Frame in a thread calling invalidate,
and let the Update run in a the too?
Thanks,
Brian
- 14
- EnumSet + contains: strange behaviorDear all,
The following example of EnumTest seems to be inconsitent with the
interface definition of contains: It executes the lines marked with
XXX, which clearly is an error. Does anyone have an explanation?
Thank you,
Ulrich
import java.util.*;
public class EnumSetTest
{
public enum EnumTest
{
ONE,
TWO,
}
public final void testEnumSet()
{
final EnumSet<EnumTest> result = EnumSet.noneOf(EnumTest.class);
if(result.isEmpty())
{
System.out.println("empty"); // enters this branch: correct
}
else
{
System.out.println("not empty");
}
if(result.contains(EnumTest.ONE));
{
System.out.println("error"); // XXX
}
if(result.contains(EnumTest.TWO));
{
System.out.println("error"); // XXX
}
}
}
- 16
- change money program - newbie questionHi,
I would appreciate any help I can get with this. The program accepts a
range of numbers (dollors) and provides a combination of the least
amount of bills and coins needed to make change for the input. This
program works for most numbers but there is a bug. try 19.99 and you
will see that the change is a penny short. Thanks for your help.
-R
public class MoneyDriver {
public static void main(String[] args) {
if(args.length != 1){
System.out.println("Please suppy only one argument on the command
line");
return;
}
double dblAmount = Double.parseDouble(args[0]);
Money m = new Money();
m.changeMoney(dblAmount);
}
}
public class Money {
Money (){
}
public void changeMoney(double dblAmount){
if((dblAmount < 0.01) || dblAmount > 9999.99){
System.out.println("The number you entered is out of range. Please
enter a number between 0.01 and 9999.99");
return;
}
double [] dblMoneyDenomination = {100.00, 50.00, 20.00, 10.00, 5.00,
1.00, 0.25, 0.10, 0.05, 0.01};
int count = 0;
for(int i = 0; i < dblMoneyDenomination.length; i++){
while((dblAmount > dblMoneyDenomination[i])){
++count;
dblAmount = dblAmount - dblMoneyDenomination[i];
}
if(count != 0){
System.out.println("Change is " + count + " " +
dblMoneyDenomination[i] + " bill(s)");
}
/* if(i + 1 == dblMoneyDenomination.length){
System.out.println("Change is " + ++count + " " +
dblMoneyDenomination[i] + " bill(s)");
}
*/
count = 0;
}
}
}
- 16
- Speeding up jsp
Hello, I'd like to know about ways to speed up a java application.
We're using jsp java beans on a webserver running Apache/Tomcat 4.1.18.
It's accessing database information through ODBC from a Microsoft SQL Server
version 8.0 database across a network. We're encountering some problems
with one jsp page because I think it's retrieving a large result set from
the database. The query in question selects from a database with over 30000
records. We're using JDBC, and limiting our select to only one database
column.
Any recommendations about speeding up the specific problem with this jsp
page, or any general suggestions on performance improvements would be
welcome.
Mike
|
| Author |
Message |
Red Orchid
|
 Posted: 2006-5-6 14:17:00 |
Top |
java-programmer, Is the design of 'ArrayList' good ?
Occasionally I think that the design of 'ArrayList' is not good.
Because ...
The access modifier of 'E[] elementData' in 'ArrayList'
is 'private'. That is, Java do not allow a programmer
to access 'E[] elementData'.
Therefore, he will write the following statements to
sort 'ArrayList'.
<example>
List<String> strList = new ArrayList<String>();
Collections.sort(strList); // <- #1
</example>
By the way, the source of #1 is as follows.
<Quote>
public static <T extends Comparable<? super T>> void sort(List<T> list) {
Object[] a = list.toArray(); // <- #2
Arrays.sort(a); // <- #3
ListIterator<T> i = list.listIterator();
for (int j=0; j<a.length; j++) { // <- #4
i.next();
i.set((T)a[j]);
}
}
</Quote>
If 'strList' is large array, #3 is merge sort.
Merge sort requires 2 * M when M is the memory
size of 'strList'.
Because the memory size of 'a' in #2 is M,
'Collections.sort' requires 3 * M and has to execute #4.
It seems inefficient. (note that 'strList' is large array)
If the access modifier of 'E[] elementData' is 'protected',
he can sort 'strList' with 2 * M and without #4.
What is your comment ?
Thanks.
|
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|
| |
|
Chris Uppal
|
| Posted: 2006-5-6 17:45:00 |
Top |
java-programmer >> Is the design of 'ArrayList' good ?
Red Orchid wrote:
> Because the memory size of 'a' in #2 is M,
> 'Collections.sort' requires 3 * M and has to execute #4.
> It seems inefficient. (note that 'strList' is large array)
It's not ideal, I agree. I think it would be better if ArrayList included the
ability to sort itself in-place (or rather, as close to in place as it can
given the requirement for a stable sort). However there is then the
"problem"[*] of ever-widening APIs, and Java traditionally tends to avoid wide
classes, so ArrayList lacks this feature.
But note that there is nothing stopping you creating your own array-backed
implementation of java.util.List which /does/ have this ability. The existing
java.util.* classes are handy, but they are not intended to be a complete set
of all possible useful utility classes. We are expected to be able to
recognise when the pre-defined stuff is inadequate and to be able to create our
own versions at need.
-- chris
[*] Not actually a problem, IMO, difficulties with wide interfaces are more a
symptom of deficiencies in the support tools than of poorly designed classes.
|
| |
|
| |
|
Mike Schilling
|
| Posted: 2006-5-6 22:21:00 |
Top |
java-programmer >> Is the design of 'ArrayList' good ?
"Chris Uppal" <email***@***.com> wrote in message
news:445c756a$2$25453$email***@***.com...
> But note that there is nothing stopping you creating your own array-backed
> implementation of java.util.List which /does/ have this ability. The
> existing
> java.util.* classes are handy, but they are not intended to be a complete
> set
> of all possible useful utility classes. We are expected to be able to
> recognise when the pre-defined stuff is inadequate and to be able to
> create our
> own versions at need.
And the existence of AbstractList and AbstractSequentialList are a big help
here.
|
| |
|
| |
|
Chris Uppal
|
| Posted: 2006-5-7 17:41:00 |
Top |
java-programmer >> Is the design of 'ArrayList' good ?
Mike Schilling wrote:
[me:]
> > We are expected to be able to
> > recognise when the pre-defined stuff is inadequate and to be able to
> > create our
> > own versions at need.
>
> And the existence of AbstractList and AbstractSequentialList are a big
> help here.
True, and I would have mentioned that myself if I hadn't forgotten all about it
;-)
Thanks.
-- chris
|
| |
|
| |
|
Robert Klemme
|
| Posted: 2006-5-8 15:39:00 |
Top |
java-programmer >> Is the design of 'ArrayList' good ?
Red Orchid wrote:
> Occasionally I think that the design of 'ArrayList' is not good.
>
> Because ...
> The access modifier of 'E[] elementData' in 'ArrayList'
> is 'private'. That is, Java do not allow a programmer
> to access 'E[] elementData'.
The reason is encapsulation. You cannot likely satisfy all design goals
that one might want to establish for a standard library and that are
desirable in a single class - in this case encapsulation and error
safety won. Note that there are classes that support continuous
ordering and with a special Comparator implementation you can even have
non set like behavior. Or you use a TreeMap and stuff collections into
the value fields. Or... Chris and Mike have demonstrated other very
valid points.
Kind regards
robert
|
| |
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|
Index ‹ java-programmer |
- Next
- 1
- change jscrollpane bar?hi,
is it possible to change the scrollbar in a jscrollpane? i wanted to
replace it with an image, is this possible? i just want to change it's
look, i've see some skins but not exactly what i wanted, and i'm not
sure how to make my own skin. if it's possible can someone tell me
how, or point me to a place that shows how to create look and feel
skins for java applications?
Thank you.
- 2
- Question for Java GurusOn Tue, 18 May 2004, email***@***.com wrote:
> I suspect that the difference lies in how fundamental we think
> those concepts are. I think that the classpath environment
> variable is a rather peculiar aspect of the JDK command-line
> tools. I much prefer, say, Eclipse 3.0, where I can choose
> project properties and just check all of the user-defined
> libraries that my project uses and expect everything to work,
> without dealing with questions of whether I can set an
> environment variable in one place or another, or oops I only
> set it in this shell so it doesn't appear in other shells, etc.
> I think it's clearly possible to develop Java software without
> worrying one bit about environment variables. So I question
> why understanding the CLASSPATH environment variable (or
> command-line option, etc) would be a necessary prerequisite to
> learning programming in Java.
This is analogous to java programmers thinking they can code
database applications without understanding the underlying
database. Oh, I'm sorry, the JVM is the only world one needs to
know.
--
Galen Boyer
- 3
- Java text compressionWhat's the fastest way to compress/decompress text?
We're doing that over really large datasets in our app. We're currently
converting char arrays to byte arrays using our own UTF-8 conversion
code, and then compressing the bytes using java.util.zip. The code is
pretty old.
I don't like this two-step process, and the profiler shows that this is
a bottleneck in our app.
Is anyone aware of any code that compresses chars directly? Perhaps a
third-party library that does it faster?
In our particular situation, decompression speed is a lot more important
than compression speed.
- 4
- Creating a (META) FAQ for c.l.j.g? (was: Re: New to the group)"S. Balk" <email***@***.com> writes:
> There is no FAQ for this newsgroup, maybe not that bad to have one...
You think so? There is so much good stuff out there that I don't think
a full FAQ is needed. What is maybe needed is some kind of meta FAQ
pointing to the most interesting stuff (the stuff which we always refer
newbies to).
What is the group's opinion about this? I would volunteer to create
such a meta FAQ if there is sufficient demand. It would be based on the
list of resources I post from time to time in response to newbie
questions.
/Thomas
- 5
- How to process 1000 request using ThreadI have one problem. What is the optimal approach for handling 1000
request by using thread.there are 2 scenario. 1 create 1000 thread and
execute the program 2. create 10 thread and pool 1000 requests by some
scheduling algorithm.
- 6
- Full Casino Source Codes For JUST $9,900We'd like to know if you or your company is interested in buying online
casino software.
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including software, flash, database and everything we have.
With full casino sourcecodes,
You own the sourcecodes
There are no royalties to pay
You can setup as many casino sites as you want, without additional cost.
You can license the software for additional revenue opportunities
You can modify software, flash and database anytime at your own will.
You can do whatever you want.
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Stunning 3d graphics and sound add quality to our casino software.
The casino software includes the popular games like roulette, craps,
blackjack, caribbean poker, paigow, video poker games, slots, multi-line
slots and more.
Also it includes full marketing and management tools for your successful
casino business.
Check our website.
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Don't think that our software value is just $ 9,900. It's way beyond even
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basis to invest in developing different software(not gaming one).
We are selling full sourcecodes including everything(software, flash,
database and documents).
If you want, we can use escrow.com to make the deal safe and ensured to
you. Using escrow.com, you can release money to us after you receive the
source codes and check/verify if your casino works as megabetcasino.com.
We can install casino on your own server for you.
Contact us if you are interested.
We are the developers of the casino software, not sales broker or
reseller.
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email***@***.com
Eplaysoft, the gaming software development company.
http://www.eplaysoft.com
- 7
- [OT] Java 7 features: PLEASE STOP IT! All of you.This is an OpenPGP/MIME signed message (RFC 2440 and 3156)
Twisted schreef:
> On Aug 2, 8:29 am, Lasse Reichstein Nielsen <email***@***.com> wrote:
> [overly verbose off-topic commentary]
Subject says it all.
H.
--
Hendrik Maryns
http://tcl.sfs.uni-tuebingen.de/~hendrik/
==================
http://aouw.org
Ask smart questions, get good answers:
http://www.catb.org/~esr/faqs/smart-questions.html
- 8
- Swing textboxes can't get focus after JFileChooserHi Java guru's,
I have a swing form that has a text field where a directory name can
be entered. Just to its right I have a button that will open the
JFileChooser dialog to allow selection of the directory name from a
dialog.
I can go in and type the directory name into the textbox by hand. So
far, so good.
I can go in and press the button, have the dialog appear, choose a
directory, and have the textbox programatically updated. Again, this
works.
But, if I press the button and choose a directory, I then lose the
ability to use my mouse to access any textboxes on my form. I am able
to use the tab button to move to, and update the textboxes.
I can't then click my mouse on a textbox and be able to enter in data.
Instead, I have to tab to it. The mouse also cannot be used to select
data within a textbox by double clicking or highlighting it. I CAN
hold down the mouse button and scroll right or left and have the
textbox's data shift if the text exceeds the width of the textbox.
But, the textbox appears to be disabled.
Interestingly enough, I AM able to use my mouse to click other BUTTONs
on the page.
So, its just the textboxes that seem affected.
Anyone have a solution or hints?
(btw, I'm using Java 1.4.2.x)
TIA
Here is my button listener:
public void actionPerformed(ActionEvent event)
{
if (event.getSource() == btnRun)
if (areAllFieldsPopulated())
{
lblStatus.setText("Processing");
ExportFunctionalAreas exportFunctionalAreas = new
ExportFunctionalAreas();
exportFunctionalAreas.ExportXml(txtInputFileName.getText(),
txtOutputFileName.getText(), txtElementName.getText());
lblStatus.setText("Finished");
}
else
{
}
else if (event.getSource() == btnSelectFile)
txtInputFileName.setText(FileHandler.OpenFileDialog(txtInputFileName,"Open
Input File","xml","XML files (*.xml)"));
else if (event.getSource() == btnOutputDirectory)
txtOutputFileName.setText(FileHandler.OpenDirectoryDialog(txtOutputFileName));
}
and here is the open directory dialog code:
public static String OpenDirectoryDialog(Component Owner)
{
JFileChooser chooser = new JFileChooser();
chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
if (JFileChooser.APPROVE_OPTION == chooser.showOpenDialog(Owner))
return chooser.getSelectedFile().getPath();
else
return null;
}
- 9
- How to get Cell ID from J2ME location API, on modern phones!Hi all, I wanted to know how to get the Cell ID using the J2ME
location API? I have found so much sites on the net bu they're all
since 2005 or 2003, and none of them contains a clear example (or even
basic idea) how to take the Cell ID. What I've tryed:
set the Criteria power management to low, so it doesn't search for
bluetooth. Everything else I've left as it is (now limits). It stops
the app for 60 secs (that's what I've set) and then it pops exception
- LocationException, which means it can't find info or timeout. I've
tested with longer times - same result. I'm sure the operator supports
it and the phone supports it (N73).
Please give an idea, please!
Thanks in advance...
- 10
- Can't compile simple Java code1 class DecimalToBinary{
2 public static void main(String[] y){
3 int dec = new Integer(y[0]).intValue();
4 if (dec/32 = 0)
5 System.out.println(0 + (dec % 32) / 16);
6 else System.out.println(1);
}}
When I try to compile the above code I get an error on line 4:
Error: unexpected type
required: variable
found : value
What is wrong??
Mvh
Johs
- 11
- got packages working/////////command line///////////////
Microsoft Windows 2000 [Version 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.
C:\>javac @comp
C:\>java -classpath
.;C:\java\classes\org\w3c\tidy\Tidy.jar;C:\java\classes\
atreides.jtidy.Tid
yTest
C:\>type comp
-d C:\java\classes\
-g
-sourcepath C:\java\sources\
-classpath .;C:\java\classes\;C:\java\classes\org\w3c\tidy\Tidy.jar
C:\java\sources\atreides\jtidy\TidyTest.java
C:\>type C:\java\sources\atreides\jtidy\TidyTest.java
// adapted from source available at:
//
<http://sourceforge.net/docman/display_doc.php?docid=1298&group_id=13153>
package atreides.jtidy;
import java.io.IOException;
import java.net.URL;
import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.FileWriter;
import org.w3c.tidy.Tidy;
public class TidyTest implements Runnable {
private String url;
private String outFileName;
private String errOutFileName;
private boolean xmlOut;
public TidyTest(String url, String outFileName, String
errOutFileName,
boolean xmlOut) {
this.url = url;
this.outFileName = outFileName;
this.errOutFileName = errOutFileName;
this.xmlOut = xmlOut;
}//tidyTest
public void run() {
URL u;
BufferedInputStream in;
FileOutputStream out;
Tidy tidy = new Tidy();
tidy.setXmlOut(xmlOut);
try {
tidy.setErrout(new PrintWriter(new
FileWriter(errOutFileName),
true));
u = new URL(url);
in = new BufferedInputStream(u.openStream());
out = new FileOutputStream(outFileName);
tidy.parse(in, out);
}//try
catch ( IOException e ) {
System.out.println( this.toString() + e.toString() );
}//catch
}//run
public static void main( String[] args ) {
String url = "http://www.google.com/";
String output = "output.txt"; //specify path?
String errorLog = "errorLog.txt"; //specify path?
TidyTest t1 = new TidyTest(url,output,errorLog,true);
Thread th1 = new Thread(t1);
th1.start();
}//main
}//TidyTest
C:\>
- 12
- FreeBSD / Eclipse 3.1 / WTP 0.7Hello,
As port of Eclipse 3.1 is already available, I was trying to install Eclips=
e=20
WTP 0.7 to improve my work with JSPs and Servlets. I installed first: GEF,=
=20
EMF, and Java EMF Model Runtime: JEM-SDK-1.1.zip (this is the problem) from=
=20
WTP site, but I have still error saying that there is no such plugin as=20
org.eclipse.jem.util - I checked plugins directory and there is such plugin=
=20
installed, in manage configuration it is shown as disabled - that's probabl=
y=20
mean that this version is incompatible with FreeBSD.
Is there anybody who installed WTP with success on Free, and can share=20
his/her knowledge on this topic? Anybody work on porting JEM and WTP to=20
FreeBSD?
Best Regards,
Lee
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To unsubscribe, send any mail to "email***@***.com"
- 13
- Open Source OCR for Java/C++I found a lot of open source ocr projects from the net. But none of
them was usable.
Could anyone recommend an open source OCR programs to me?
For Java or Windows VC++ or Linux G++
Thanks
Jack
- 14
- 15
- Any way to turn off array bounds checking? (Matrix multiplication is so slow!)
I am just starting to learn Java J2RE 5.0. I coded the matrix library
below and found that the array accessing is really slow since each
access is checked:
http://f1.pg.briefcase.yahoo.com/bc/agascoig/vwp2?.tok=bccV1CVBYRRfg_eF&.dir=/Guest&.dnm=ComplexDoubleMatrixJava.zip&.src=bc
It appears that with gcj and a -f switch I can turn off the array
bounds checking.
Will a JVM ever be smart enough to know that if the array bound is a
constant variable within a loop, that it can multiply and check the
final array index is within bounds before doing the loop, and then only
have to check once? It seems stupid to me that a general Matrix isn't
included in the Java class libraries. Anybody have a better general
Matrix library in Java?
Also, a newbie observation, that Double (capital D) didn't get passed
as a reference. Why not? This seems dumb to me, as all other objects
seem to get passed by reference.
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