How to write a Timer program in java - Java Discussion Boards

Re: java.lang.ClassNotFoundException

Oscar020-Dec-11 14:08

Oscar0

20-Dec-11 14:08

Maybe try changing your jar filename to no spaces.

Re: java.lang.ClassNotFoundException

arthur89kim22-Dec-11 14:07

arthur89kim

22-Dec-11 14:07

thanks for the suggestion. I will try to solve it.

Re: java.lang.ClassNotFoundException

jschell22-Dec-11 8:45

jschell

22-Dec-11 8:45

arthur89kim wrote:

<layer>What causes the above problem and what solution can be proposed to solve it?

The class is not in the class path. The solution follows from that.

arthur89kim wrote:
I have created a Java game (183MB for .jar file) and can be played on local (offline) through .html and it works perfectly fine.

Which means it is in the class path.

Although it isn't clear what you mean by "through .html".

I will note some oddities.
1. 183 meg is a really big jar
2. Class name doesn't follow standard naming.
3. Jar name shouldn't have spaces in it.

What happens if you change, ONLY in the html, to XXX.jar? That should specifically fail because the jar doesn't exist. However if you get the same error then I would suppose that your jar is not being found on the server (thus it won't be in your client and not in the class path.) That is a guess though.

Re: java.lang.ClassNotFoundException

arthur89kim22-Dec-11 14:09

arthur89kim

22-Dec-11 14:09

Thanks for the suggestion. I will try the solution proposed. Smile | :)

createBranchElement

prithaa16-Dec-11 21:39

prithaa

16-Dec-11 21:39

Hello,

public class Doc extends PlainDocument  {

    private static final long serialVersionUID = 1L;

    /*protected AbstractElement createDefaultRoot() {
        return super.createDefaultRoot();
    }
    */
    protected Element createBranchElement(Element parent,AttributeSet a)
    {
        return super.createBranchElement(parent, a);
    }
}

public class TestDocView {
Doc D = new Doc();	  	 
AbstractDocument.BranchElement E1 =  (BranchElement) D.getDefaultRootElement(); 
D.createBranchElement(E1, A);
}

I get runtime error for

D.createBranchElement(E1, A);

saying Illegal casting of AbstractDocument.BranchElement.

How should I use CreateBranchElement()?

Thanks
Prithaa

Re: createBranchElement

TorstenH.19-Dec-11 22:30

TorstenH.

19-Dec-11 22:30

a runtime Error??

Please use an IDE. Eclipse and Netbeans are free. No need to work on console.

Your Exception pops because the method createBranchElement(Element parent, AttributeSet a) is inheriated from AbstractDocument[^]. I guess it doesn't return much.

regards Torsten
When I'm not working

Re: createBranchElement

Apr^Ngp22-Dec-11 17:46

Apr^Ngp

22-Dec-11 17:46

prithaa wrote:
AbstractDocument.BranchElement E1 = (BranchElement) D.getDefaultRootElement();

You haven't shown us the implementation of

Java

getDefaultRootElement()

Also, what's the relation between BranchElement and Element.

Apurv

If Java had true garbage collection, most programs would delete themselves upon execution.

How to write a Timer program in java

VickyVicki15-Dec-11 6:23

VickyVicki

15-Dec-11 6:23

Hi Friends,

I would like to know , how to write a timer program.For eg the application should trigger after a particular time.Thanks in Advance Smile | :)

Re: How to write a Timer program in java

Richard MacCutchan15-Dec-11 6:34

Richard MacCutchan

15-Dec-11 6:34

VickyVicki wrote:
the application should trigger after a particular time.

Trigger what? Do you mean that it should run doing nothing until a certain time of day or until a certain time interval has elapsed? In either case a quick look at the Java documentation for something to do with Date[^]s or times should help.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

Re: How to write a Timer program in java

TorstenH.15-Dec-11 19:25

TorstenH.

15-Dec-11 19:25

Don't believe Richard, for him time is something that is flying by Laugh | :laugh:

GregorianCalendar [^]is so much better!

Combine it with This one about running System Commands[^].

The rest is up to you - that is what development is about. Make a plan, write things down, sketch a GUI and afterwards start implementing what you've written down.

regards Torsten
When I'm not working

Re: How to write a Timer program in java

Richard MacCutchan15-Dec-11 22:32

Richard MacCutchan

15-Dec-11 22:32

TorstenH. wrote:
time is something that is flying by

Faster every year! Cry | :((

TorstenH. wrote:
GregorianCalendar

I can never remember this class, even though it's obvious.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

Re: How to write a Timer program in java

Nagy Vilmos16-Dec-11 2:00

Nagy Vilmos

16-Dec-11 2:00

Richard MacCutchan wrote:
Faster every year

As they sang in Trumpton[^]:
[sing]
Time flies by when you're a driver of a train,
Speeding out of Trumpton with a cargo of cocaine.
I get high when im a pilot of a plane.
Touching down in Camberwick,
I'm stoned out of my brain.
[/sing]

Panic, Chaos, Destruction. My work here is done.
Drink. Get drunk. Fall over - P O'H
OK, I will win to day or my name isn't Ethel Crudacre! - DD Ethel Crudacre
I cannot live by bread alone. Bacon and ketchup are needed as well. - Trollslayer
Have a bit more patience with newbies. Of course some of them act dumb - they're often *students*, for heaven's sake - Terry Pratchett

Re: How to write a Timer program in java

Richard MacCutchan16-Dec-11 2:30

Richard MacCutchan

16-Dec-11 2:30

I never really watched Trumpton, but my children used to love it.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

Re: How to write a Timer program in java

David Skelly15-Dec-11 22:21

David Skelly

15-Dec-11 22:21

Well, you could use the Java Timer class:

http://docs.oracle.com/javase/6/docs/api/java/util/Timer.html[^]

Or if your requirements are more complicated, try something like Quartz:

http://quartz-scheduler.org/[^]

Re: How to write a Timer program in java

VickyVicki16-Dec-11 1:33

VickyVicki

16-Dec-11 1:33

Thanks for all your replies. Smile | :)

I wanted something like an quiz system .After the particular time getsover the application should stop and also should start after a specific min

Re: How to write a Timer program in java

Nagy Vilmos16-Dec-11 1:56

Nagy Vilmos

16-Dec-11 1:56

If you need to measure an elapsed time, a simple Thread with a sleep or wait in it may be sufficient.

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Tech Mentro14-Dec-11 21:56

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14-Dec-11 21:56

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Doc extends PlainDocument problem

prithaa13-Dec-11 3:05

prithaa

13-Dec-11 3:05

Hello

I am using the following code to use createLeafElement from PlainDocument

public class Doc extends PlainDocument {

private static final long serialVersionUID = 1L;

protected Element createLeafElement(Element parent, AttributeSet a, int p0, int p1)
{
return createLeafElement(parent, a, p0, p1);
}
}

The above class without the createLeafElement() method works fine .But if I add this method I get runtime error saying program not responding.

My purpose is to use createLeafElement() method.How can I use it?

Thanks
Prithaa

Re: Doc extends PlainDocument problem

Nagy Vilmos13-Dec-11 3:47

Nagy Vilmos

13-Dec-11 3:47

0. Wrap code in <pre> tags please.
1. What is the exact exception? Try using copy/paste.
2. The method wont work try calling the super implementation:

Java

public class Doc extends PlainDocument {	

    private static final long serialVersionUID = 1L;	

    protected Element createLeafElement(Element parent, AttributeSet a, int p0, int p1) {
        return super.createLeafElement(parent, a, p0, p1);
    }	
}

3. Finally, why override if you are not changing anything?

Re: Doc extends PlainDocument problem

prithaa13-Dec-11 4:18

prithaa

13-Dec-11 4:18

thanks for your advice

I dont want to override but the method createLeafElemenmt() and createdefaultroot() are not visible when I want to use them directly.

With the following object D1 the methods are not visible.

PlainDocument D1 = new PlainDocument();

Thanks for your time

Re: Doc extends PlainDocument problem

Nagy Vilmos13-Dec-11 4:26

Nagy Vilmos

13-Dec-11 4:26

The example I gave should work as it calls the protected method on the super class.

Re: Doc extends PlainDocument problem

prithaa13-Dec-11 4:33

prithaa

13-Dec-11 4:33

yes it does do the needful
but why are the methods not visible in the subclasses
protected methods should be visible in subclasses,is it not?

thanks
prithaa

Re: Doc extends PlainDocument problem

Nagy Vilmos13-Dec-11 4:38

Nagy Vilmos

13-Dec-11 4:38

Read this[^] to understand access modifiers. If something is protected it is visible within the package and to any sub-classes. By being visible to the sub-classes, it can be called from the class, but not from classes referencing the class.

Re: Doc extends PlainDocument problem

prithaa13-Dec-11 4:40

prithaa

13-Dec-11 4:40

thanks

Distributed Anti-Spam System

PalleStol11-Dec-11 22:42

PalleStol

11-Dec-11 22:42

I'm in the process of making the specifications for a project that i have to make at my university. The main topic is distributed systems. I've decided to make a distributed anti spam network.

By this i mean:

* Peer-to-peer network
* Each node can request / respond to queries about email identification signatures
* A catalogue of nodes and email signatures are stored locally with each peer

Now i'm just concerned if this could be defined as a distributed system or if it is just a network?

I hope you can answer my question.

Thanks Smile | :)

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