About Java Object ???

Hi..,,
I have a general question ? Is it possible to read a java object into R/3(not using WAS or EP ).
If there is any, Please let me know..
Thanks

Sunil,
I am not sure what exactly you are looking for. Can you explain?
Regards,
Ravi

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Book recommendation about java objects

Hi I've been reading books and writing java for about 2 years. most of the books look the same. they cover different parts of java such as I/O, networking, GUI..
But I am very interested is understanding about objects and how they work or should be created and used. What does extending, implementing, interfaces,... really mean. I do have a general understanding of it and I use them all the time but mostly by looking at examples and based on my own ideas but it seems that most of the design that I do can be done in so many ways. I look at source codes of others and some designs make sense to me while others are confusing and have dozens of classes and sub classes all mixed into a package. I want to have a better understanding of object. any books or tutorial or other suggestions would be greatly appreciated.

If you want a book specifically tied to Java, http://java.sun.com/docs/books/javaprog/ is very good. James Gosling is one of the authors, so it really reflects the design philoophy of Java. It is also clearer on the tradeoffs made in the design than books by "Java advocates" seem to be.
The class ic work on OOP is "Object Oriented Software Construction" by Bertrand Meyer. It needs study - but it repays the effort.

Question about java objects and handles?

Let me see if I can explain what I have. Inside my originating Java code, I create an object, let's call it object A, from a class I that I DON'T have the source for. It's not my class. Object A in turn creates an object, let's call it Object B, from a class I don't have the source for. Then Object A creates another object, let's call it Object C, that I DO have the source for, and passes it the reference to Object B that it created. My question is this: In my originating Java code, how do I get a reference to Object B? Or, how can I get the reference to Object C, which would allow me to get the reference to Object B?
Hope everyone understands that?

Thanks for the reply. Perhaps I should have mentioned that Object A does not have a method to return a referenece to Objects B and C. That's my problem. Was just wondering if there is some other way to obtain those refereneces. The reason I mentioned that I don't have the source code for Object A is because if I did, I could obviously write a method that would return me the references.
I'm not new to Java, nor am I an expert either. I'm pretty well up-to-speed on object oriented design though.
I'll provide more specifics on my problem just in case there is a solution to my problem. My code (class) is attempting to establish a connection with a mainframe computer through a web server portal using terminal emulation software provided by a 3rd party vendor. They provide an SDK that contains all the java classes necessary to establsih the connection. To establish the connection, you are required to build a java Properties object that contains all the parameters for the connection (host id, etc.) and pass that properties object to the constructor for the "Object A" class. That object actually establishes the session object using the parameters object you pass it. The session gets displayed in a standalone Applet ("Object A" class extends Applet). You can click on the applet, sign in to the system, and do whatever just fine using your keyboard. However, I wish to send commands to the session from my originating java code. The session object has a method to send commands to the session, but to do that, I need a handle to the session object that was created. I don't have that, and it appears they don't provide a method to get that. Looks like the vendor's intent was just for the user to interface with the session/Applet via the keyboard.

Notify JavaFX about Java objects changes.

Good day. I'm trying to solve the problem with willions solutions. Unfortunately, I don't understand some part of them. The rest part of solutions doesn't work properly.
The idea is very simple and naive.
I have a rather complicated Java model (many Java beans live in runtime.)
This Java model is wrapped with single controller (ModelController).
ModelController is a singletone. It has several methods:
1. addObject
2. updateObject
3. removeObject
4. getObject (can't be modified, read-only mode)
5. getModel (can't be modified, read-only mode)
Also I have a JavaFX application which asks ModelController for model (*ModelController.getInstance().getModel()*) and displays this huge model.
The problem is: i would like to send a notification to JavaFX part with message:
Command{
changeType=CREATE|UPDATE|DELETE
objectId=someId
It will be an object with two fields.
So JavaFX part will go to ModelController.getInstance().getObject("someId") and repaint it.
What is the best way for establishing such link?
Is it possible to bind JavaFX to some variable of type Command.
Java-part will change this variable with new value, JavaFX part will go to controller and ask for object in response.
Please, help me.

JavaFX classes can extend Java classes and interfaces. So just have a listener interface that you implement in JavaFX.
class Model {
    ModelListener listener;
    public void addListener(ModelListener l) { listener = l; }
    void someFunctionThatUpdatesTheModel() {
        listener.notify();
interface ModelListener {
    void notify();
// In JavaFX...
class MyModelListener extends ModelListener {
    override function notify():Void {
        // do something useful
var model = new Model();
model.addListener(MyModelListener{});

How to parse XML to Java object... please help really stuck

Thank you for reading this email...
If I have a **DTD** like:
<!ELEMENT person (name, age)>
<!ATTLIST person
     id ID #REQUIRED
>
<!ELEMENT name ((family, given) | (given, family))>
<!ELEMENT age (#PCDATA)>
<!ELEMENT family (#PCDATA)>
<!ELEMENT given (#PCDATA)>
the **XML** like:
<person id="a1">
<name>
     <family> Yoshi </family>
     <given> Samurai </given>
</name>
<age> 21 </age>
</person>
**** Could you help me to write a simple parser to parse my DTD and XML to Java object, and how can I use those objects... sorry if the problem is too basic, I am a beginner and very stuck... I am very confuse with SAXParserFactory, SAXParser, ParserAdapter and DOM has its own Factory and Parser, so confuse...
Thank you for your help, Yo

Hi, Yo,
Thank you very much for your help. And I Wish you are there...I'm. And I plan to stay - It's sunny and warm here in Honolulu and the waves are up :)
A bit more question for dear people:
In the notes, it's mainly focus on JAXB,
1. Is that mean JAXB is most popular parser for
parsing XML into Java object? With me, definitely. There are essentially 3 technologies that allow you to parse XML documents:
1) "Callbacks" (e.g. SAX in JAXP): You write a class that overrides 3 methods that will be called i) whenever the parser encounters a start tag, ii) an end tag, or iii) PCDATA. Drawback: You have to figure out where the heck in the document hierarchy you are when such a callback happens, because the same method is called on EACH start tag and similarly for the end tag and the PCDATA. You have to create the objects and put them into your own data structure - it's very tedious, but you have complete control. (Well, more or less.)
2) "Tree" (e.g. DOM in JAXP, or it's better cousin JDOM): You call a parser that in one swoop creates an entire hierarchy that corresponds to the XML document. You don't get called on each tag as with SAX, you just get the root of the resulting tree. Drawback: All the nodes in the tree have the same type! You probably want to know which tags are in the document, don't you? Well, you'll have to traverse the tree and ask each node: What tag do you represent? And what are your attributes? (You get only strings in response even though your attributes often represent numbers.) Unless you want to display the tree - that's a nice application, you can do it as a tree model for JTree -, or otherwise don't care about the individual tags, DOM is not of much help, because you have to keep track where in the tree you are while you traverse it.
3) Enter JAXB (or Castor, or ...): You give it a grammar of the XML documents you want to parse, or "unmarshall" as the fashion dictates to call it. (Actually the name isn't that bad, because "parsing" focuses on the input text while "unmarshalling" focuses on the objects you get, even though I'd reason that it should be marshalling that converts into objects and unmarshalling that converts objects to something else, and not vice versa but that's just my opinion.) The JAXB compiler creates a bunch of source files each with one (or now more) class(es) (and now interfaces) that correspond to the elements/tags of your grammar. (Now "compiler" is a true jevel of a misnomer, try to explain to students that after they run the "compiler", they still need to compile the sources the "compiler" generated with the real Java compiler!). Ok, you've got these sources compiled. Now you call one single method, unmarshall() and as a result you get the root node of the hierarchy that corresponds to the XML document. Sounds like DOM, but it's much better - the objects in the resulting tree don't have all the same type, but their type depends on the tag they represent. E.g if there is the tag <ball-game> then there will be an object of type myPackage.BallGame in your data structure. It gets better, if there is <score> inside <ball-game> and you have an object ballGame (of type BallGame) that you can simply call ballGame.getScore() and you get an object of type myPackage.Score. In other words, the child tags become properties of the parent object. Even better, the attributes become properties, too, so as far as your program is concerned there is no difference whether the property value was originally a tag or an attribute. On top of that, you can tell in your schema that the property has an int value - or another primitive type (that's like that in 1.0, in the early release you'll have to do it in the additional xjs file). So this is a very natural way to explore the data structure of the XML document. Of course there are drawbacks, but they are minor: daunting complexity and, as a consequence, very steep learning curve, documentation that leaves much to reader's phantasy - read trial and error - (the user's guide is too simplicistic and the examples too primitive, e.g. they don't even tell you how to make a schema where a tag has only attributes) and reference manual that has ~200 pages full of technicalities and you have to look with magnifying glas for the really usefull stuff, huge number of generated classes, some of which you may not need at all (and in 1.0 the number has doubled because each class has an accompanying interface), etc., etc. But overall, all that pales compared to the drastically improved efficiency of the programmer's efforts, i.e. your time. The time you'll spend learning the intricacies is well spent, you'll learn it once and then it will shorten your programming time all the time you use it. It's like C and Java, Java is order of magnitude more complex, but you'd probably never be sorry you gave up C.
Of course the above essay leaves out lots and lots of detail, but I think that it touches the most important points.
A word about JAXB 1.0 vs. Early Release (EA) version. If you have time, definitively learn 1.0, they are quite different and the main advantage is that the schema combines all the info that you had to formulate in the DTD and in the xjs file when using the EA version. I suggested EA was because you had a DTD already, but in retrospect, you better start from scratch with 1.0. The concepts in 1.0 are here to stay and once your surmounted the learning curve, you'll be glad that you don't have to switch concepts.
When parser job is done,
what kind of Java Object we will get? (String,
InputStream or ...)See above, typically it's an object whose type is defined as a class (and interface in 1.0) within the sources that JABX generates. Or it can be a String or one of the primitive types - you tell the "compiler" in the schema (xjs file in EA) what you want!
2. If we want to use JAXB, we have to contain a
XJS-file? Something like:In EA, yes. In 1.0 no - it's all in the schema.
I am very new to XML, is there any simpler way to get
around them? It has already take me 4 days to find a
simple parser which give it XML and DTD, then return
to me Java objects ... I mean if that kind of parser
exists....It'll take you probably magnitude longer that that to get really familiar with JAXB, but believe me it's worth it. You'll save countless days if not weeks once you'll start developing serious software with it. How long did it take you to learn Java and it's main APIs? You'll either invest the time learning how to use the software others have written, or you invest it writing it yourself. I'll take the former any time. But it's only my opinion...
Jan

How to Pass Java Objects between Web Dynpro and Java SAP iViews

Basically I have an SAP web dynpro iView that I do stuff with and I want to pass an object to another iView which is just a regular Java iView. From what I've read and tried, I can't just stick something in the session object and hope that the Java iView can pull it down the other end. I had a dream that it was possible (seriously).
Anyway, are there any possible solutions around? Please advice and share you throughts. I will try to dream about it again tonight and see if its really gonna work this time.
thanks for your help in advance

There is no easy way you can pass objects other than those supported by express such as String, map, list etc.
Though not advised, you can create a class with static variables to handle the storage of such java objects during transition between form and workflow. You will need to somehow identify the objects uniquely .

Getting information about an object from JList

Hi
I have created a movie application and i have a JList displaying all registered movies, it uses a DefaultListModel to display these.
I want to be able to click on an element in the JList and then push a button called "Show movie details" to display all information about the selected movie.'.
Every new movie is added to the DefaultListModel as an object with "Titlle", "Genere" etc. If someone click on a movie, what do i do to get information about which object that was clicked. All i can see is that integers can be returned with the getSelectedIndex/Value methods. If i use one of these methods to get the object from the DefaultListModel, that would work i guess, but what when someone deletes a movie in the middle of the JList, then the indexes wouldnt match.
Can someone help me out here? :)

I get a big fat exception when trying to cast the returned object to a Movie object which im using.
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: java.lang.S
tring cannot be cast to Movie
...sure that this is the way to do it? If so, what am i doing wrong..

How to store a Non Serializable Java Object ?

Hi..
I have a non serializable java object which I want to store in the Oracle database and retrieve it. Can anyone help me with how to go about doing this ?
many thanks in advance
Ragavan

If you share the same JVM then its possible, but I doubt that is the case. If you don't share the JVM then its
impossible to share an object between two apps.
But if all your attempting to do is duplicate the object in the other app then I spose it is possible, as long as
you can reconstruct the object from information that you can interegate from the object.
For example, if you have App A, and App B. WIthin App A is a Double d object. Then you could get the
value of the Double by doing:
d.doubleValue()
write the double to a file/socket/stream, read the file/socket/stream at the other end, create a new Double
via Double d = new Double(parsedValue);
Now the two Apps will have a Double d object that represent the same value via a a.equals(b) == true, but
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James.

Bug in Java objects not serializable

I plan to use the latest version TopLink 10.1.3.1.0 with Oracle Database 10g (10.2.x).
Do I still have to use the “Type Conversion” mapping as I had to do in order to address the reported non-serializable bug exiting in TopLink (9.0.4.5). See the link for the bug description:
http://www.oracle.com/technology/documentation/1012_solaris/relnotes.1012/relnotes/toplink.htm#CEGEBDEG
My Java object instance variable is defined as java.sql.Timestamp and the corresponding data type on the Oracle DB is defined as TIMESTAMP(6). Can I use the direct-to-field mapping from now on with new TopLink 10.1.3.1.0 without the serializable issue? If I still have to use the Type Conversion mapping, please help provide some detail about the mapping.
Many thanks for any help.

From what I can understand from your reply, I can use the direct-to-field mapping for Java class attribute of java.sql.Timestamp to the Oracle DB 10.2.x data type of TIMESTAMP(6) without any issue of not serializable. Please confirm. Many thanks!
By the way, I am having the same issue (Java objects not serializable) with Oracle DB 10.1.x when I use the direct-to-field mapping. It seems to me that this is more than the Oracle 9i JDBC driver.
If I have to do this with TopLink 10.1.3.1.0 + Oracle 10.2.x, I plan to use the Type Conversion with:
Java class attribute: java.sql.Timestamp
DB data type: oracle.sql.TIMESTAMP
Is this the proper way to do it? Please confirm.

Need Information About Java Platform Overview For Manager (WJTB-310)

Hi, My name is Jeffry. I need information about Java Platform Overview For Manager (WJTB-310).
I need Information about table of contents, how long it takes to study that training (approximately), how many chapters are in that training, minimum Internet connection speed to access that training, and everything you know about WJTB-310.
Is there a synchronized audio in WJTB-310 ?
Is there a video streaming in WJTB-310 ?
Can I receive a certificate for any web-based training ? especially in WJTB-310 ?
Is there a programming language material in WJTB-310 or just an overview ?
Sorry for asking to many question
Thanks
Jeffry Kristianto Yanuar

I thought I'd give you a response even if I can't answer your question completely. (I think we ought to start a separate thread entitled "How do you get any replies on this forum???") Here is what I have been forced to do. I introduced some JavaScript on the web page that contains the applet I want to be run. The sole purpose of the JavaScript is to detect which platform the client is on. If it's not MacIntosh, then I have JavaScript write the <object><embed> tag used by the Java plug-in. It it is MachIntosh, then I have JavaScript write the regular <applet> tag and let the Mac browsers do as best they can. With mixed and disappointing results. Netscape 6.2 crashes with a lot of applets. IE 5 brings up the applet okay but certain Swing components aren't displaying properly. The MacIntosh I've been testing on is version 9.1. I'm trying OS X tomorrow.
Why don't you send a reply to my query under the Java Plug-in Forum--from aronsz, dated 06/11/02--if you have some more info by now. I sure would appreciate it.

Using java object in a non java application

Can you tell me how will i be able to use a java object(how can i instantiate a java class) in a non java application.I have read about COM,DCOM but these are fine only with micrososft platforms .Can anyone offer me alternative solutions...i also have read about CORBA ...kindly pour in your advice

i have read about it thats true but had i understood it from the material i wouldnt have asked for help ..instead i would i have been working on my project..

Database access from flex thro java objects

Please tell me how to access the data from the MS SQL server
through a java object and connect it to flex and display the data
in flex.
please provide me the code for this assignment.
Thanks in Advance.
Selvakumar.

What would you consider when choosing between FDS and PHP
(via HTTP) for mySQL communication?
My app doesn't need to be real time but I am concerned about
the load on the webserver running PHP. Is that a typical point of
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How to read and map schema into Java objects

I'm new to JNDI and LDAP<br>
How can I read the schema from a directory into Java objects?<br>
I need access to the object classes and get all the required and optional attributes... then details about the attributes themselves like its type, cardinality (single or multivalued), etc.

Hi naidu,
1. We can use this type of path
computername
folder
file.ext
2. We can use this in GUI_UPLOAD
   and it will run on presentation server,
   connect to
computer
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regards,
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Question about Java apps structure

Hello guys,
I'm a professional C++ programmer and I would like to start learning Java. I'm reading about Java from here and there and would like to ask you about how a java program is structured compared to C++.
So in C++, I have main.cpp (or any other file name, doesn't matter), which contains a the main() function, and I have .h and .cpp class files that I instantiate (basically) in my main function to get my program to work.
In Java, I'm confused and can't really find the "general" rule to how stuff are organised. I noticed that every class has a main function (why?), and there's no global scope. And "somehow", file names must exactly be equal to the class names.
The question is: how are Java files of classes (and other stuff, if available) are arranged to create a program? What's the standard why? And How can I have many classes together in a single main()?
Thank you for any efforts :-)
Edited by: 927494 on 13.04.2012 07:02
Edited by: 927494 on 13.04.2012 09:10

Thank you guys for the replies. I still have some more doubts :-)
Do I have to have a file for the implementation and a file for the definitons, like cpp and header files? or just everything inside the class?
Why does Netbeans fail to compile when I change the class name? what should I change with the class name in general to have it compile correctly? From what I understand till now, the top level class's name (the class with the main() function that's gonna be executed) has to be equal to the file name (and I got that this is the sufficient condition for the app to compile), while the same file can have more classes if I wish. Did I get that right?
I don't know if I get that right too, we pass only a SINGLE class/file to the compiler, and it automatically resolves ALLLL the included files automatically, unlike C++, where all cpp files have to be passed to the compiler/makefile to create object files, and then the executable is created after linking all those object files with the libraries together. i.e.: Java doesn't really need a makefile because making is really simple with only 1 filename. True?

Question about Java's HttpServer: Threading? Backlog?

Hello,
I have two questions about Java's HttpServer (com.sun.net.httpserver). From the JavaDoc:
>
Management of threads can be done external to this object by providing a Executor object. If none is provided a default implementation is used.
>
How can I get information about the default implementation in 1.6.0_13? Do you know the behavior? From my observations, the default implementation uses no Threads, meaning every request is handled in the same Thread, this results in handling the requests to the HttpServer one after another.
Is this right?
The second question is about this, also from the JavaDoc:
>
When binding to an address and port number, the application can also specify an integer backlog parameter. This represents the maximum number of incoming TCP connections which the system will queue internally. [...]
>
When setting the backlog to -1, it uses the systems default backlog. How can I determine the systems default backlog? Can some lines of Java code reveal it (there is no getBeacklog() method)? Or is it up to the Operating System (we use Redhat Linux)?
Thanks a lot for your help!
Regards,
Timo

How can I determine the systems default backlog?You can't. There is no API for that even at the C level.
Can some lines of Java code reveal itNo.
Or is it up to the Operating System (we use Redhat Linux)?Yes. Linux provides a large default. It seems to be at least 50 on most platforms. This is not something you should be worrying about.

About Java Object ???

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