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Index ‹ java-programmer
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- 1
- Implementing inheritance in JAVAHi,
I am a naive JAVA user. Can you please tell me, oh how to implement
the following scenario
A
^ ^
/ \
B C
^ ^
\ /
D
Classes B and C extends class A, but how to define class D, such that
members of both B and C are available to D.
Thanks
>> manjunath
- 3
- 3
- SET CLASSPATHhi, i'm using the abstract class definition, and when compiling the abstract
class it's ok, but the problem is when compiling the subclass: i get the
following message:
Rect.java:9: cannot resolve symbol
symbol : class GeoFigure
location: class figures.Rect
public class Rect extends GeoFigure
^
1 error
the abstract class is called: GeoFigure;
and the subclass is Rect
so how cn use the set classpath at command line, should it include the
directory where are located all the package files(the abstract class and
subclass .java files), or should it point at onel evel before the directory
that contains the package files?
thank's!
--
SAID BARA
- 4
- Welcome Back Roedy Green!Have you been back for awhile? (Maybe I'm just stupid!)
I was . . surprised to see a post from you
:)
- 4
- emailtosmsemail***@***.com wrote:
> Anyone know how to send sms from email i [sic] mean email to sms
Set the phone number as the destination address, according to the standard
mapping of phone numbers to email addresses set by the devices service provider.
--
Lew
- 5
- Making Internet DialerGreetings;
I am trying to build a windows internet dialer... I have gained
control of my modem through javax.comm API and I can dial a number
through my modem... the problem is I can not figure out how to pass
the username and password to my ISP.
I want to know what steps are involved in getting connected to my
isp... and also I want my windows O/S to know that i am connected.
Any resource given will be helpful.
I hope someone can help me in this regard.
Thanks
- 5
- Download a webpage that contains javascriptI am trying to download the html page at
http://www.dreamteamfc.com/dtfc04/servlet/PostPlayerList?catidx=1
Using the code
public class DownloadWebPage
{ public static void main (String[] args) throws IOException
{
URL url = new
URL("http://www.dreamteamfc.com/dtfc04/servlet/PostPlayerList?catidx=1");
BufferedReader webRead = new BufferedReader(new
InputStreamReader(url.openStream()));
String line;
while ((line = webRead.readLine()) != null)
{
System.out.println(line);
}
}
}
But all I am getting is
<HTML><HEAD><SCRIPT
LANGUAGE="JAVASCRIPT">location.replace("http://www.dreamteamfc.com");</SCRIPT></HEAD></HTML>
I'm guessing that when the web brower meets this code it executes the
javascript
location.replace("http://www.dreamteamfc.com")
And somehow loads the web page.
How do I go about downloading the actual web page that gets displayed
in a normal web browser.
Any help appeciated!
pat
- 5
- JDO nad MYSQLHello.
Im looking form examples usage JDO (opensource) to MYSQL. It's possible to
it ???
Where can I find it ???
Thanks for Your help
E.N
- 7
- Removing Item From JList - getSelectedIndex problemHi all,
I am currently working on a JList that populates data into a JList
from a CSV file. I have a button that is supposed to get the Selected
index and then delete that item from the JList. Below is the code that
I am using:
int index = lstComputerExceptions.getSelectedIndex();
System.out.println("index is: " + index);
model.remove(0);
int size = model.getSize();
if (size == 0) { //Nobody's left, disable firing.
btnDelete.setEnabled(false);
} else { //Select an index.
if (index == model.getSize()) {
//removed item in last position
index--;
}
lstComputerExceptions.setSelectedIndex(index);
lstComputerExceptions.ensureIndexIsVisible(index);
}
I have printed out what index is and no matter what item I have in the
Jlist I have selected it will always print out
-1. Therefore keeps on causing my program to crash and not delete the
item out of the Jlist.
Any help in this matter would be highly appreicated.
Thank you
- 8
- newbie java/OOP questionPerhaps someone here can help me with this, I tried asking someone else
about this but couldn't quite describe my question.
I understand that this syntax calls a method on behalf of an object:
b1.method();
but in some java example code I see stuff like this (from a link list app) :
answer.head = IntNode.listCopy(head);
I know that "head" is an instance variable of the class, specfically an
IntNode. I also know that "answer" is a method variable of the type
IntLinkedBag.
My question is: what the heck is going on during the "answer.head"
operation? I don't understand how answer is interacting with head.
They're just two objects. What does the period do when it connects two
objects?
Any pointers or keywords to look up would be apprecited.
--
Mike
Block Banner Ads Now
http://everythingisnt.com/hosts.html
- 13
- changing code while program is runningHello,
I would like to have my class code loaded into application, which is
already running. I tried something like this:
public class Main
{
...
private void reloadClass() throws Exception
{
new Pair("","").print(); //class to be reloaded
System.in.read (); //interval - here comes manual class recompilation
ClassLoader.getSystemClassLoader ().loadClass ("Pair"); //reload class
new Pair("","").print(); //check if new version loaded
}
}
It seems that ClassLoader.loadClass checks the presence of the Pair
class in memory and doesn't relod it. How to omit it?
regards
blacky
- 14
- java/81177: java patch server down
>Number: 81177
>Category: java
>Synopsis: java patch server down
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: freebsd-java
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: update
>Submitter-Id: current-users
>Arrival-Date: Tue May 17 20:30:07 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator: Ron
>Release: FreeBSD 5.4-STABLE i386
>Organization:
>Environment:
System: FreeBSD justok.thuisnetwerk.nl 5.4-STABLE FreeBSD 5.4-STABLE #0: Sat May 14 16:24:15 CEST 2005 email***@***.com:/usr/obj/usr/src/sys/MYKERNEL i386
>Description:
jdk14 and jdk15 can not be installed, because http://www.eyesbeyond.com/freebsddom/java/jdk15.html is down.
<code/input/activities to reproduce the problem (multiple lines)>
Use any webbrowser to visit the URL, and see that it's down.
>How-To-Repeat:
>Fix:
Someone should bring up the webserver or let the URL point to a webserver that is up.
>Release-Note:
>Audit-Trail:
>Unformatted:
- 15
- How can JComboBox listener to MouseEvent?
Since JComboBox and JButton both are
extends from JComponent.
When I addMouseListener(this);
for jButton, it listens to the MouseEvent.
But jComboBox doesn't listen to the MouseEvent.
public void mouseEntered(MouseEvent me) {
System.out.println("mouse entered");
jComboBox.setToolTipText("mouse entered"); // not work
jButton.setToolTipText("mouse entered button"); // works fine
}
mouseEntered just move your mouse pointer on
the object, no need to click (pressed and released).
I just want to detect the mouse entered on JComboBox
(i.e. popup a ToolTip) before I click it for select an item.
Do I miss something? Do I need to setXXX and/or enableXXX
JComboBox before I addMouseListener?
Thank Q for your help!
- 15
- Recognize Windows ShutdownHi,
how can i recognize that Windows is shutting down (when i'm logged off)?
Sorry for stupid questions, but i didn't found the right solution!
Greets,
Nico
-> remove the underscores in the email <-
- 16
- Doubt regarding InterfacesThanks everyone for your replies!
I have a basic question - in the above instance Runnable is an
interface and interfaces cannot be instantiated. So something like 'new
Runnable()' seems puzzling to me. Is this syntax for instantiating an
object of the Anonymous class?
Also, is the above snippet similar to the following in the end result:
class ac implements Runnable{
public void run() {
System.out.println("Hello World on " +
Thread.currentThread());
}
};
ac doHelloWorld = new ac();
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| Author |
Message |
Rodger
|
 Posted: 2007-1-10 5:21:00 |
Top |
java-programmer, download utilities and tools for programming
Have you guys ever heard of deligio.com? A download community for
programmers and software engineers...you can post your own
software..looks pretty neat
|
| |
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| |
|
Andrew Thompson
|
| Posted: 2007-1-10 11:26:00 |
Top |
java-programmer >> download utilities and tools for programming
Rodger wrote:
> Have you guys ever heard of ..
Spammer? Of course we have! They are a dime
a dozen, and I'm looking at one right now.
>.. A download community for
> programmers and software engineers...
So is sourceforge, but for some bizarre reason,
the sourceforge folks do not see any need to come
here hawking their product.
What makes you so special?
>..you can post your own software..
ditto, sourceforge.
>..looks pretty neat
P*ss off.
Andrew T.
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Index ‹ java-programmer |
- Next
- 1
- performance and memory usage.
Hi
I created a test program to try the speed and size management of the JDK
HashMap. With regards to this I was wondering if anybody has any
comments on whether this is an appropriate way of testing this
performance, i.e. how realistic is the results with respect to caching
influence of data, heap management etc. The code is simple, but would it
produce a correct result. (the program finishes in 11 seconds on my
machine). the code is attached.
Secondly, I was wondering about the memory (heap) usage in java for this
program. It needs at least 256 MB of heap to run to finish. cmd:
java -Xms32m -Xmx256m -cp target/classes/ App
Using -Xmx128m causes OutOfMemoryError.
When calculating on the size of the datastructure i find approx that
2M Dto's = 16MB
2M Integer's for map key = 8MB
2M Integer's for ArrayList = 8MB
Thats a total of 32MB plus some megabytes for the objects,
datastructures, JVM and so on. So probably about 48-64MB in total.
Thats a completely different number from 128 MB or 256 MB.
Does anybody have any comments on why the program requires that much memory?
arnie
*****************
/* Create 2 million Dto objects with random data and insert into HashMap
also add key to an iterable list */
public void test1() {
int size = 2000000;
Map<Integer, Dto> hmap = new HashMap<Integer, Dto> (size);
Collection<Integer> alist = new ArrayList<Integer> (size);
Random r = new Random();
Dto data;
for (int c=size; c>0; c--) {
data = new Dto();
data.ip= r.nextInt(2000000000);
hmap.put(data.ip, data);
alist.add(data.ip);
}
int c = 1;
for (Integer d : alist) {
hmap.get(d);
}
}
/* Simple data placeholder */
public class Dto
{
public int ip;
public int serialnum;
}
- 2
- Java encryption <--> .NET encryptionHajo,
I need to exchange encypted data between
.NET and Java environments. The first
problem I encountered is that symmetric
ciphers in .NET needs initialization
vector and Java counterparts don't.
Can some one point me out the place
where I can find any practise and
patterns for encrypted communication
between Java and .NET ?
thanks for any info
Gawel
- 3
- Error :could not initialize interface awt - Exception:java.lang.ExceptionInInitializerErrorHello
i had problems by the install of the german language pack 6.0.2.CF1
for a Lotus domino Server 6.0.2 CF1.
the System:
Acer altos 19000 Server
2X Pentium Pro 200 Mhz
512 MB Ram
OS windows 2000 Server SP4
the Update of the Notes Server was no Problem but when I tried to
install the Language Pack German (its an Java install Wizard ) there
coms the following Error Message :
Error :could not initialize interface awt - Exception:
java.lang.ExceptionInInitializerError
and if i installd the java software jre 1.3.1 standart the Aplet in
Systemcontrol could not be opend without anny Error Message.
what can I do?
Please help.
Thanks for Help
Stefan Germany
- 4
- How to receive events from a jcombobox in an internal Jpanel ??Good evening,
I've a Frame with two Jpanel, in Jpanel1 I've a Jcombobox and it's
listener while in Jpanel2 I've a JLabel where I want to write the
selected value of the Jcombobox,
Jpanel1 , Jpanel2 and the main frame are in 3 separate class and files,
this because I want to arrange a modular design.
My question is how I can receive in the main Frame the event coming
from Jcombox value changed in Jpanel1 ???
Thanks for your help
Antonio
www.etantonio.it/en
- 5
- JComboBox strange behaviorHello!
I have interesting problem with javax.swing.JComboBox (java 1.4.2)
When I click at combo to open list - there is no reaction to mouse
moves except these on combo header or outside my combo. So I cannot
choose any item from the list.
But I can use keyboard...
This is default combo, I've just create it and populate some Strings
into it.
any idea what's wrong?
B.
- 6
- Help needed (GUI/passing objects)
Hi, I'm a student learning java. In my latest assignment, I am to create a
Scheduler/Diary, with a GUI.
I am getting the error
Exception in thread "main" java.lang.NoSuchMethodError: BaseFrame: method
<init>
()V not found
at Dairy.main(Dairy.java:22)
From the main method in 'project.class', I create the diary object, which
creates month and day objects etc...
I create a state object, which takes in the Diary Object and points to the
selected month, day, appointment etc
I then create a gui object, which is to change the state (through methods in
the state).
This error occurs whenever I pass in the state object to the GUI
('BaseFrame').
Exception in thread "main" java.lang.NoSuchMethodError: BaseFrame: method
<init>
()V not found
at Dairy.main(Dairy.java:22)
I'm not sure whats causing this. I'm checking like 22 in the 'diary' class,
but it's a }. Not too helpful.
GUI appears when no state object is passed, can't manipulate the data with
that though....
In main:
------------
//set up the Diary
Diary dia = new Diary();
//set up the state
State diaryState = new State(dia);
//Set up the gui
BaseFrame firstFrame = new BaseFrame(diaryState);
---------------
When setting up the GUI:
---------------
State curState;
//constructor for the basic frame, takes in a state object
public BaseFrame(State sta)
{
curState = sta;
.....................}
--------------------------
Done a search online, didn't get too far. Any ideas? What does that error
mean exactly?
- 7
- PrintServiceLookup.lookupPrintServices fails to list new printers until re-start (JDK1.4.2_03, Linux RedHat, Tomcat 4.x)Hi Forum,
How could I get
javax.print.PrintServiceLookup.lookupPrintServices(null,null) to return the
current available services while the program that uses lookupPrintServices
is running? In a tomcat servlet I use the lookupPrintServices(..) to get a
list of the printer services available. The class works well and returns the
list but if I install a new printer, the servlet does not list the newly
installed service until I restart Tomcat. Is there a way to unload and
reload the PrintServiceLookup class and then call
PrintServiceLookup.lookupPrintServices?
It appears that the lookupPrintServices(..) returns the list of services
that was available when the instance of the virtual machine was started.
Hence, while the instance is running, it allways returns the same list of
services. If I run a program that lists the services and then exits, the
program lists the newly added printer on re-run. But if the program never
exits (it runs in a loop, re-listing the services every so often), and I add
a new printer while the program is running, the newly added printer is not
listed until I terminate teh rpogram and re-start it.
Thanks in advance for your responser
- 8
- src.zip of j2ee1.4 sdkHi,
I downloaded the j2ee1.4 sdk, but I can't seem to find the source files
in that package. They used to be in a src.zip file, or not? Anyway I
already looked at the Sun website, but I didn't find a URL to download
the source files from.
Kind regards,
Dirk
- 9
- Java FACT ?"FACT: Java has no first-class functions and no macros. This results in
warped code that hacks around the problem, and as the code base grows,
it takes on a definite, ugly shape, one that's utterly unique to Java.
Lisp people can see this clear as day. So can Python folks, so can Ruby
folks. Java people flip out, and say "macros are too much power",
or "what do u mean i dont understand u" or "fuck you, you jerk,
Lisp will NEVER win". -- Steve Yegge, 2006-04-15
what would you people make of the above statement ? Has anyone here
used Lisp *and* Java on major projects ? If so would you say this
sounds off-base or correct ?
thanks,
--dcnstrct
- 10
- Vetoing a change by DefaultCellEditor in JTableI'm using a DefaultCellEditor with a JTextField to capture a String
that is ultimately passed to setValueAt in my TableModel. In that
method, I have logic which could throw an exception if the String's
contents proves to be invalid (i.e. one use is where the String is a
regular expression that might be syntactically invalid).
How can I handle this? Right now, the code throws an Exception which
I'd like to catch, display a dialog, and then return the user to
editing without ever committing the value. Is this easily doable?
Regards,
Brian.
- 11
- Reference and Garbage CollectionI'm not quite sure about what kind of references to an object determine
its "alive" quality and its readiness for garbage collection. For the
moment I understand that *any* living reference, including non-explict
of member classes, keep the object alive.
Would you agree that the follwoing class "NeverRelease" entails
instances which will never get prone to garbage collection?
class NeverRelease
{
Child1 child;
public NeverRelease ()
{
child = new Child1();
}
private class Child1
{
}
}
While would you also agree that instances of the following class
"AlwaysRelease" always become garbage because the member class is static
and hence does not take reference to the enclosing class?
class AlwaysRelease
{
Child2 child;
public AlwaysRelease ()
{
child = new Child2();
}
private static class Child2
{
}
}
- 12
- Precision problem with doubleHi everyone,
I am a Java beginner, and I am trying to create a very simple binary
tree.
Each node has a value, the left child has the same value + an
increment, the right child has the same value - the same increment.
I try to recursively create the tree, but I have precision problems.
My "main" node has a value of 10, the increment is 0.1, tree depth is
4
So i want a tree that goes like this :
depth 1 : 10
depth 2 : 0.9 / 10.1
depth 3 : 0.8 / 10 / 10 / 10.2
depth 4 : 0.7 / 0.9 / 0.9 / 10.1 / 0.9 / 10.1 / 10.1 / 10.3
But at depth 4 when I try to print the value I get 9.700000000000001
instead of 9.7, and 10.299999999999999 instead of 10.3
And things get worse when the depth increase.
All the values and increment are stored in double (native type).
Is it normal? How can I avoid this problem?
Thanks a lot,
Tom.
[main class]
double increment = 0.1;
double startValue = 10;
int maxDepth = 4;
Tree myTree = new Tree(startValue, 1);
myTree.recursivelyCreateChildren(increment, maxDepth);
[Tree.java]
public int depth;
public double value;
public Tree leftChild;
public Tree rightChild;
Tree(double value, int depth){
this.value=value;
this.depth=depth;
System.out.println("node of depth " + depth + " created, value = " +
value);
}
public void createChildren(double increment){
rightChild = new Tree(value - increment, depth+1);
leftChild = new Tree(value + increment, depth+1);
}
public void recursivelyCreateChildren(double increment, int maxDepth)
{
if (depth < maxDepth){
createChildren(increment);
leftChild.recursivelyCreateChildren(increment, maxDepth);
rightChild.recursivelyCreateChildren(increment, maxDepth);
}
}
- 13
- JNI: passing Objects containing non-primitive types back and forthHi folks,
looked through a lot a threads overhere already but did not find an
answer detailed enough:
I want to map a c-structure like this created in my native code
struct mystruct {
long pid ;
long data[] ;
long meta[][] ;
} ;
to a java-object within my Java-code which would look like this IMHO:
public class ComplexData {
final int maxdata = 100 ;
final int maxmeta = 5 ;
private long pid ;
private data[] = new long[maxdata] ;
private meta[][] = new long[maxdata][maxmeta] ;
public void ComplexData() {
// Assigning values
pid = 1234 ;
data[0] = ...
}...
As far as I understood it is now possible to pass this Java-object to
the native code using the JNI-Function NewObject and read the members
and assign their values to the c-structure's members (to make them
available from within c) and the other way round, assign the values
from the c-structure to the members within the Java-object (possibly
without the initialization in the "Java-world" (I need both
directions).
My problem now is: How do I access the object's members (especially
the array types) from within c? Functions pointed to in different
threads (e.g. (Get|Set)LongArrayRegion ) need the reference to the
array, but I have only the reference to the object up to now.
Any code snippets based on the code above would be helpful.
Cheers
Bernd
- 14
- Any HID support for Java?Human Interface Device (mouse, etc)
Does anyone know whether java support the HID devices? (under MS
Windows)
I checked the document but did not see any. A google on this group
also returns little information.
Thanks a lot.
- 15
- Location of Temp Directory?I'm having an app developed for me and they are storing the files in a
newly created folder on the C: drive but I don't want to make directory
there. Is there not a way to get the temp variable for machine, like
%temp or %tmp? Thanks
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