Some simple question about JVM

I am newer of Java, and is somewhat confused.
Dose J2SE and J2ME use the same JVM if both run on smae OS?
I don't found J2ME's implementation on Windows Platform, is that mean I cannot use the J2ME on Windows?
What does implementation mean? I often see the word in J2SE, is that mean implementation JVM and classes packages.
Wish anyone can make me clear.

J2ME is a Java runtime environment for small devices, such as cell phones. Such devices don't run operating systems such as Windows XP, so there is no J2ME for Windows XP.
J2SE (Java 2 Standard Edition) is the version of Java meant for standard desktop / laptop / server computers.
Look up the word "implementation" in a dictionary.
J2SE is only a specification. You need an implementation of the specification to be able to use it. Compare it with a house: if you have the blueprints, the drawings that explain how the house should look, you don't have a house yet. You'll have to build it first before you can live in it.

Similar Messages

Some Simple Questions about the CE

Hi ,Experts .
I am new to the CE .
I read some information about the CE Architecture,
I am wondering the difference between the CE and Net weaver studio ,CE and GP ,VC ect .
what i really want is that using flex plug-in edition ,in the CE or NetWeaver ,as both is Eclipse based ,i think it's a reasonable way .
Which enviroment is better ,for enterprise UI 2.0 means flex component can communicate with web dynpro without any difficulty ,while the webdynpro can communication the flex component through the way of implenent the flex component into webdynpro as normal way implementing a webdynpro component ?
Any tips ?
Thanks in Advance
Eleanor

Hi,
>>>I am wondering the difference between the CE and Net weaver studio ,CE and GP ,VC ect .
With the SAP NetWeaver platform, you can align IT with business requirements. SAP combines composition technologies and application functionality to reduce IT complexity and increase business flexibility. With SAP NetWeaver, you can compose applications using enterprise services, orchestrate business processes and events, manage enterprise information, and deliver applications and content to users more quickly and cost-effectively.
SAP Netweaver includes a comprehensive set of tools.
SAP NetWeaver Composition Environment u2013 Provides a robust environment for design, deployment and running of composite applications that comply with enterprise service-oriented architecture .
SAP NetWeaver Developer Studio u2013 Offers a convenient user interface and rich functionality for developing J2EE applications
>>>what i really want is that using flex plug-in edition ,in the CE or NetWeaver ,as both is Eclipse based ,i think it's a reasonable way .
SAP NetWeaver CE includes:
Support for different layers of a composite application (including Java EE 5 development, service layer, user interface technologies, and process layer)
Software tools and templates at all levels to increase development efficiency and application homogeneity
Model- and code-generation-based methods via tools that store models in a proprietary metamodel repository
To facilitate the development of composite applications, SAP NetWeaver CE supports the following:
Application development with Eclipse-based SAP NetWeaver Developer Studio
User interface design with SAP NetWeaver Visual Composer, Web Dynpro, and SAP Interactive Forms by Adobe
Process orchestrations with guided procedures
Service composition with SAP Composite Application Framework
Service discovery and registry with UDDI-compliant, Enterprise Services Repository
Application deployment with Java EE 5-based SAP NetWeaver Application Server
Solution life-cycle management with SAP NetWeaver
The SAP NetWeaver Composition Environment (SAP NetWeaver CE) provides a robust environment for the design and implementation of composite applications. It offers the tools and the environment necessary for building and running composite applications fast and efficiently.
I hope this will clarify you.
Regards
Aashish Sinha

Pro Tools convert to Logic Newbie some simple question for logic users

Hey guys, I am a recent convert from Pro Tools! and There were just some simple questions I thought some of you may be able to help me out with. I am using Logic 9.1.1
1) After I set up a multi timbral software instrument (in this case MOTU Symphonic Library) how do I set up midi channels to trigger the individual sounds in the instrument. (in pro tools I used to create a midi track then send an output of that track to that particular soft synth)
2) How do I set up a and forgive my Pro Tools vocab but basically I want to set up a reverb channel on an aux track have it receive on a bus so I can send other tracks to that particular bus.
Thanks for the insight and really looking forward to finally make use of all this ram! lol

1) I have a nord stage and would like record via midi. In pro tools i would usually need to create a midi track with the output set the the nord and an audo aux track to hear it What would I do in order to record midi from my nord stage?
To record, just select a non-audio track, hit record and play the keyboard. The notes will get recorded into a region.
If you want to play it back to the Nord Stage as well, then it makes sense to set the Nord up as a MIDI device in your templates, so you can just add the Nord to a track and not worry about what MIDI ports it's on etc. Open the environment, create a New -> Instrument, called it "Nord Stage", set the MIDI port and MIDI channels it's on, and sav your template.
Now, when you start a song, to sequence the Nord, you just assign the Nord instrument to a track (by for instance, right clicking on a track and choosing your Nord instrument from the list of environment obects that appears).
2) The multi instrument trick is quick and easy its great but How would I do that manually?
Lots of ways, look into your key commands, ther are all kinds of "Create track with same instrument", "Create track with next MIDI channel" and so on. There are too many ways to do this to quickly talk about here. In short, all tracks have an environment object assigned to them, whether it's an audio object, or a MIDI instrument object, and this determines where the data on the track goes.
3) How do you set up midi so that it doen'ts overwrite notes when recording over them?
Not sure I understand you here...

A simple question about performance!

Hi! I have a simple question about performance. Suppouse that you have a servlet or a class with DB access, and you need to use a value several times in that page. What is best, to assign the value from say, a resultset or a request.getParameter() to a variable or to call the resultset or the request every time you need to retrieve that value? Which option uses less memory, which is faster, etc.?
Hoping the best fou u
Raul

If you need more values from a db, the best is to open some connections (connection pool) and use the for accessing the db.
To get the data only once, open the connection, get the data, store the data whereever you want: variable (class), hidden control (if you want to send from one page to another by request) and close the connection as quicky as possible.
The advantage of the first method is that the most time consuming activity (connections opening) is done only once.

I have a Macbook Pro june 2011... I have 8GB ram but I only have 256mb VRAM... I've read some other questions about this and I realized... Why do I not have 560mb of VRAM since I have 8GB of RAM? Is there any way to get more VRAM to play games on steam?

I have a Macbook Pro june 2011... I have 8GB ram but I only have 256mb VRAM...
I've read some other questions about this and I realized... Why do I not have 560mb of VRAM since I have 8GB of RAM?
Is there any way to get more VRAM to play games on steam?
I've learned by reading other topics that I can't upgrade my graphics card on my Macbook Pro because it's soldered into the motherboard or somthing like that, but please tell me if there is any way to get more video ram by chaning some setting or upgrading something else. I'd also like to know why I only have 256MB of VRAM when I have 8GB of RAM, since I have 8GB of RAM I thought I was supposed to have 560mb of VRAM...
So the two questions are...
Is there any way to upgrade my VRAM, so that I can play games on steam?
Why do I only have 256MB VRAM when I have 8GB total RAM?
Other Info:
I have a quad core i7 Processor.
My graphcics card is the AMD Radeon HD 6490M.
I am also trying to play games on my BOOTCAMPed side of my mac, or my Windows 7 Professional side.
THANK YOU SO MUCH IF YOU CAN REPLY,
Dylan

The only two items that a user can change on a MBP are the RAM and HDD (Retinas not included). You have what the unit came with and the only way you will be able to change that is to purchase a MBP with superior graphics
If you are very much into gaming, the I suggest A PC. They are far superior for that type of application to a MBP.
Ciao.

Simple question about mount and delay script

Hello, I have a simple question about mounting volumes on start up.
My computer wakes up auto - and then auto there are serveral applescript tasks (mount and start up programs)
I use this script (daily) for serveral connections with external volumes I always need the connect to. ( In the script I use this code 3 times for other locations) I do this on start up.
set Uname to "XXX"
set Pword to "XXX"
set someVolume to "afp://XXX.XXX.XXX.XXX/XXX/XXX
mount volume someVolume as user name Uname with password Pword
(same code for 2 other locations)
When i do this on start up sometimes the script says there is no connection possible. I guess it's because on start up the connection isn't there. And 1 minute later when computer is total ready the connection is ok. When I run the script then It works. Just sometimes ( In the morning) 'It' want to connect but the script stops. When i do it manually(I run the script again) it works just fine.
Is it possible that I need a delay? Can someone explain this?
How would I make a delay handler for this script? Is that the best solution?
Thanks in advance. This is something small i'm wondering about.
Colin

BTW, If you saved the script as an application +(and not as an application bundle)+ you could drop the script on to *Drop Script Backgrounder* (freeware).
Then the script would run in the background, so, you wouldn't see it running in the Finder.
<http://www.macupdate.com/info.php/id/7922/drop-script-backgrounder-x>
Tom

Some generic questions about JMF

Hi, as new to JMF, I would like to ask some generic questions about JMF from this community
Though including RTP stack, JMF is only compatible to old RTP draft, RFC1889. I know that Sun stopped developing/supporting JMF. What is the alternative solution for JAVA RTP implementation suitable for a serious SERVER project, not just a school-term project? Has anyone thought about that or may have already moved forward? Is that any commercial or more updated Java based RTP stack currently? I searched with google. Besides jrtp, a school project, and I could not find a nice one. Majority of RTPstack implementation is C/C++.
My second question is if there is the performance analysis and comparison of JMF. I know that some client applications such as SIP-Communicator adopt JMF for media delivery. But it is for one user in one machine. I wonder if any server application has adopt JMF as media relaying layer.
I appreciate any input from this community.

erwin2009 wrote:
Hi, as new to JMF, I would like to ask some generic questions about JMF from this communitySure/
Though including RTP stack, JMF is only compatible to old RTP draft, RFC1889. I know that Sun stopped developing/supporting JMF. What is the alternative solution for JAVA RTP implementation suitable for a serious SERVER project, not just a school-term project? Has anyone thought about that or may have already moved forward? Is that any commercial or more updated Java based RTP stack currently? I searched with google. Besides jrtp, a school project, and I could not find a nice one. Majority of RTPstack implementation is C/C++. There is one active project out there, Freedom for Media in Java, that has RTP capabilities. It's obviously not from Sun, but it's the only other RTP-capable project I am aware of, other than FOBS4Java, I believe is the name of it.
What they are suitable for is beyond my scope of knowledge, I only know of the 2 projects.
My second question is if there is the performance analysis and comparison of JMF. I know that some client applications such as SIP-Communicator adopt JMF for media delivery. But it is for one user in one machine. I wonder if any server application has adopt JMF as media relaying layer. None that I have seen, except for various projects I've helped people with on this forum. But, if someone is asking for help on a forum with his/her server application, it probably doesn't meet the guidelines you just laid out ;-)
I appreciate any input from this community.Sorry I don't have more to add to your inquires...

A simple question about combo box

Dear All,
Just got a simple question about combo box: I have one of these selectors with labels based on filtered rows from a table.
Is it possible to have one more label that would select all options?
Like:
Product A
Product B
Product C
All Product
Many thanks for your help!
Gilles

Hi Gilles,
The purpose of ComboBox itself to select single option out of many.
For your purpose, you may have to use "List Builder" which can accomodate 1 or more to select.
Please revert for more clarification if you need.
With best wishes
BaaRaa.

Some basic question about SCM Installation

Hi Folks,
Could you please advice me about some basic questions about SCM and its installation -
Q1. Do I need to have an R/3 System to be able to practice OR demo the SCM system?
Q2. If, yes, which version of SCM is compatible with the ECC 5.0?
Q3. What are the basic requirements to install SCM (version compatible with ECC 5.0) and ECC on a oracle db and windows OS?
Q4. Does SCM have APO and BI as an inbuilt functionality OR does the user need to purchase these as an Add-On?
I know these are some basic questions, but these will help me give me a direction.
With best wishes,
Krishna

Hello Krishna -
Q1. Do I need to have an R/3 System to be able to practice OR demo the SCM system?
---> There are various Modules in SCM Like APO (Sub Modules DP (stand alone), SNP Needs Master data from R/3 and has to pass on transactional Data to R/3, PPDS same as SNP, GATP same as SNP), ICH needs Data from R/3 to work with. Core Interface (CIF) connects R/3 to APO for transferring data.
Q2. If, yes, which version of SCM is compatible with the ECC 5.0?
-->For thorough understanding explore the following links
http://help.sap.com/saphelp_scm41/helpdata/en/9b/954d3baf755b67e10000000a114084/frameset.htm
http://help.sap.com/saphelp_scm50/helpdata/en/9b/954d3baf755b67e10000000a114084/frameset.htm
Q3. What are the basic requirements to install SCM (version compatible with ECC 5.0) and ECC on a oracle db and windows OS?
-->Refer Above
Q4. Does SCM have APO and BI as an inbuilt functionality OR does the user need to purchase these as an Add-On?
--> APO comes with a small BI inbuilt functionality. you can only perform certain functions using that BI.
Hope this helps.
Regards,
Suresh Garg

Some basic questions about DAC

Hello
I am just starting to use DAC now and I have some basic questions about DAC..
1: How many different kinda image tables are there, what are they used for?
2: In order to check which ETL mapping with in the same execution plan is taking a long time, what to do? I mean is there a table that stores such info?
3: How to determine which ETL task to run after and which after?
4: Is subject area always map to the Informatica workflow folder? Or what should subject area be?
Please shed some lights on it, deeply appreciate!
Thanks

Hi,
I have problems to understand you question but will do a try:
From a logical point of view objects can be only serialized reasonabely when they have a state of it's own which can be reestablished at a later point in time and space without further dependencies.
F.E. a "serialized file" would NOT make much sense cause it depends heavily on the state of the underlying file system.
You can't expected that is can be deserialized at a later point of time (physical file refered may not longer exists) or on another machine, where the serialized object was transported to.
Technical - at zero approach - it's more or less trivial. Simply implement Serializable and all non static, non transient fields of your object will be serialized automatically.
But there is a couple of pitfalls, you should study documentations regarding this feature.
Hope this helps
Martin

Simple question about flex and AS 3.0

Hi, this might sound like a simple question so I apologize...
I have both a copy of flex 2 and 3, and i want to simply code in AS
3.0 not mxml. I referred to the help of both flex 2 and 3, and all
i could come up with is "you can add dynamic behavior to your
documents using actionscript", which means to me, you only write
your functions in AS and create instances with mxml (...ugh).
personally, i find mxml to be ugly (mainly because it looks like
html to me), and i'd rather not use it. coming from programming in
an IDE in Java, it seems like it would be nicer to have something
similar, all the while having the power and cool features of flash.
I'm not fully educated in this matter so i understand that i could
be totally wrong.
i mean, if i have to code in mxml, i will. i'm a web
programmer for a living, and if a more experience programmer said
something like "if you don't code mxml in flex, you'll never get a
job coding in flex", i would trust the advice, and learn the ugly
code. :)
yes, i do have Flash cs3, it's great but it seems like a pain
to me the way you organize classes.... i've only seen a few
tutorials, ones that explain how you cannot simply import a custom
class, you have tell your movie to link to it, put it in the same
directory, or manually name the package, it's sort of confusing.
my main point here is that i'm very eager to start building
apps in straight AS 3.0 instead of using flash cs3 (for some
projects), and it would be cool to get some help or be pointed in
the right direction.
to simplify:
can i write AS 3.0 and only as 3.0 in flex 2 or 3? how? can
you link me to a tutorial? any advise?
thanks!

Hey William, thanks for the post. It's a great coincidence
because I'm reading that book as well. I'm about half way through
it, and I love it. I installed mxmlc on my linux box and am writing
pure AS 3 apps. I think that's the way to go, though I know it's
not for everybody.
My problem with mxml is that it has a weird syntax for
function calls, and it's not as 'intuitive' for a person like me,
who came from C++ and Java programming in the past. I like writing
programs in the C++ and Java style syntax, and since so many other
languages use a similar syntax, I don't see any reason to learn the
nuances of mxml, unless I was getting paid to do it. As far as I
can tell there is no benefit.
I hate using Flash to write flash apps as well, I feel like
they become messy and confusing, especially when trying to write an
OOP application. I only use it if I want to move an object in a
very specific way and can't do it with the Tween methods.

Some random questions about integration features

Greetings,
after working for a few weeks with Autovue's ISDK (web server) and having some sucess with its integration with our custom CMS, I have a few random questions about what can be done and what can't be done. So, instead of opening many new threads, I'll post them here together.
1) Translation. We are localised in Russia, and its translation is incomplete. I have found a tra_en.properties file in AutoVue/bin, and a description about how to create a properties file for custom actions. But no information about how to translate to other languages - and russian translation appears to be packed within the jar of the applet. Is there a clean way to translate, or refine the current translation, so we don't get a mix of russian and english commands in the applet? Because my tries using EXTRABUNDLES have failed, as I don't want to add a bundle for extra actions, but to replace it for existing ones.
2) Attachments in markups. Markups allow to attach other files, but since our CMS is custom, we only get the option to attach files from our local drives. We did no browse integration with the CMS, as people with different levels of permission will have different access to files there, and we considered unnecessary to provide that level of integration. We are considering to remove this action from the GUI, but before that I'd like to evaluate how hard would it be to generate an upload file action, so the attached file would be stored in the custom CMS and linked to it so the whole thing worked. My guess is "it will be hard and time consuming", so for now, we are considering to delete this feature in our integration.
3) Is there a way to resize the Open markup dialog? We have several properties displayed, and fit well within a standard screen, but the dialog is small and you have to scroll the table to see all properties.
Thanks for any assistance with these issues

As always, thanks for the fast answer, Artash.
Yes, now I see attachments are stored inside the markup file. The problem is, when I open markup mode for the attachment, since the attachment uses some kind of default access method, my url's from the integration with the background CMS are broken completely. I believe the ideal state here would be to make some kind of inner markup for the attachment, maybe stored within the original markup file along the attached file. Or maybe it works that way, and I need to access it with the default gui action instead of my custom one. If that is the case, is there any way to tell the gui file how to differentiate a standard opened file from an attached one? If so, the issue has solution. If not... Well, then maybe something escapes me.
Edited by: Jordi Bosch on Apr 6, 2012 12:27 AM

A very simple question about WF

hi experts
I would like to ask a question about workflow
as u may know there is 'Loop' step in workflow, but I am confused when should I use Loop?
Is this step used for processing internal table? if yes, why shouldn't I create a custom BOR method and pass the entire internal table to the method?
many thanks

hi
loop step for not process the internal table,
this is used to process the some steps repetely until condition True or False.
we have two loop steps is there
WHILE AND UNTIL.
Thanks
sitaram

Some general questions about multi-threading

Hey Everybody,
I have a dilemma with a multi-threaded program that I have written.
Well to be truthful I actually wrote the program with no consideration whatsoever for multithreading.
As a result of this complete lack of concern I get a completely hung user interface.
My program performs a lot of network communications over URL��s and also writes information from URL��s to disk. The combination of networking and I/O in my program and the fact that I have not built multi-threading into the program has lead to complete failure of the user interface. When I say complete failure I mean complete failure. If it were only button��s not responding then I wouldn��t be all that worried, however the entire drawing area of my programs ��Frame�� completely freezes. It��s cool if nothing is maximized or minimized over the frame but as soon as this happens my programs drawing area has a ��serious hang over!��.
I have begun learning about threads, in principle they sound wicked however in practice they have proven to be a brain tease (oops �K.. honesty).
The difficulty of threads should not be all that daunting to me, however I have a couple of very simple questions that I would love to have answered�K..anybody out there!!!!!!!!!
This is the normal basic method of running a thread that I have been attempting to incorporate into my program:
1). Extend the thread class,
2). Override the run() method in the subclass (created from step 1),
3). Create an instance of the subclass,
4). Call the start() method on the instance (from step 3).
I have read that every statement the thread will execute is contained within it��s run() method.
Question 1). This being the case is it possible to have member variables or methods inside a class that extends thread? Please explain!
Question 2). Can a class that extends thread contain a constructor? Please explain!
Question 3). If a subclass of thread cannot contain a constructor as I assume to be the case then how can code executing within the newly spawned thread reference information from the object that spawned it?
If anybody out there on the great net can answer even half of one of these questions I will be more than grateful. Thanks for your time, and rock on Java!
David

Thread t = new Thread(MyRunnableDerivedClass);
t.start();I hope it is understood that MyRunnableDerivedClass is actually an object of the MyRunnableDerivedClass. sorry for the confusion.
so here's a thread that reads from a file using constructors, member variables, other funcs. It's not optimal but shows use of all of the above. I just typed this in so there are probably syntax errors, but you should get the point.
public class ThreadedFileReader implements Runnable
    private File m_File;
    byte[] contents = new byte[0];
    public ThreadedFileReader( File f )
       m_File = f;
    public void run()
        BufferedInputStream bis = null;
        try
            bis = new BufferedInputStream( new FileInputStream( m_File ));
            int avail = bis.available();
            while (avail > 0)
                int oldLen = contents.length();
                contents = expand( contents, avail );
                bis.read( contents, oldLen, avail );
                avail = bis.available();
        catch (Exception e)
        { //do something witty
        finally
            try{ if (bis != null) bis.close(); } catch (Exception e){}
   private byte[] expand( byte[] oldBuf, int addedLen )
      byte[] newBuf = new char[oldBuf.length + addedLen];
      System.arrayCopy( newBuf, 0, oldBuf, 0, oldBuf.length );
      return newBuf;
   public byte[] getContents()
       return contents;
//here's where we use it
File f = new File( "c:\myfile" );
ThreadedFileReader tfr = new ThreadedFileReader( f );
Thread t = new Thread( tfr );
t.start();
t.join();
// At this point the thread has died, but the thread object still exists
byte [] data = tfr.getContents();

Some basic questions about rmi registry context "bind" and "lookup"

We have more processing to do than can be accomplished with a single computer. To solve the problem I've implemented a distributed computing solution using RMI. (The first time I saw RMI was about 2 weeks ago, so please bear with me!)
The implementation is a proof of concept not a fully fleshed out system. I have one "Workunit Distributor" computer and any number of "Data Processor" computers all on the same lan segment. "Workunit Distributor" and "Data Processor" computers are both RMI client and server to each other. The "Data Processor" computers are given the ip address and name of the "Data Distributor" on the commandline when they start. They communicate their willingness to receive and process a workunit to the ""Workunit Distributor" via a RMI call. Work units are sent to available "DataProcessors" and results are eventually returned to the "WorkunitDistributor" (minutes or hours later). The model program works quite well, and appears to be capable of doing the processing we need to get done.
But now that it seems viable, I've been asked to make it a little more scalable, flexible and self configuring. In particular, instead of one "Workunit Distributor", any number of "Workunit Distributors" should be allowed to show up or disappear from the lan at any time and the system should continue to function. I've worked out a good scheme for how this can be done, but I have a couple of questions about the RMI registry (registries?). I'm trying to keep from implementing some functionality that may already be available as a library or subsystem.
With my current model design, each computer binds to its own registry with a unique name. For instance:
CRDataProcessorImpl crdpi = new CRDataProcessorImpl(svr);
Context crDataProcessingContext = new InitialContext();
crDataProcessingContext.bind("rmi:"+hostName, crdpi);
Currently the "Data Processors" get the info they need for a Context lookup() of the one and only "Workunit Distributor" from the commandline. And the info the "Workunit Distributor" needs to do a Context lookup() of a "DataProcessor" is passed to it from each "DataProcessor" via a RMI call.
But in the newer (yet to be implemented) scheme where any and all "Workunit Distributors" show up and disappear whenever they feel like, the naming bootstrapping scheme described above won't work.
I can imagine a few ways of solving this problem. For instance, having "Workunit Distributors" multicast their contact information on the lan and have a worker thread on each "Data Processor" keep track of the naming information that was multicast. Another alternative (more organized, but more complex) might be to have a dedicated host with a "well known" address and port that "Workunit Distributors" and "Data Processors" could all go to, to register or look up at an application level. Sort of a "domain name service" for RMI. But both these schemes look like a lot of work to implement , debug and maintain.
The BEST thing would be if there was one plain vanilla RMI registry that was usable by all RMI enabled computers instead of having each computer have its own local name registry. In volume 2 of the Core Java2 book it says that every registry must be local. I'm only hoping there's been progress since the book was published and now a central rmi registry is available.
If you have any ideas about this I'd like to hear what you know.
Thanks in advance for any advice.
Lenny Wintfeld
ps - I don't believe web services, as full featured as it is, is a useful alternative. I'm moving 100's (in the future possibly 1000's) of megabytes back an forth for processing.

The local bind/rebind/unbind restriction is still there and it will always be there.
I would look at
(a) RMI/IIOP, where you use COSNaming as a registry, which doesn't have that registriction, and which also has location-independent object identifiers
(b) Jini.

Some simple question about JVM

Similar Messages

Maybe you are looking for