Data stores for Java - Java Discussion Boards

Richard MacCutchan11-Sep-11 7:20

11-Sep-11 7:20

Sorry, I don't know, you will need to research it. This is a Java technical forum, and your question is some way outside of the subject.

Unrequited desire is character building. OriginalGriff

Re: hi

GANESH238911-Sep-11 7:27

GANESH2389

11-Sep-11 7:27

sry.. ontology s a general concept..
there s a separate api fof this ontology is jena ontology tool.. so nly i askd

Re: hi

TorstenH.11-Sep-11 22:49

TorstenH.

11-Sep-11 22:49

http://jena.sourceforge.net/ontology/[^]

Tutorial[^]

Support[^]

This is a quite special thing, you should refer to the mentioned websites. Write a tutorial here when you're familiar with the theme.

regards Torsten
I never finish anyth...

hi guys,,

GANESH238911-Sep-11 3:21

GANESH2389

11-Sep-11 3:21

im new to this site..
im interested in java programming...
could any one help me how to begin it ???

Re: hi guys,,

Simon Bang Terkildsen11-Sep-11 3:30

Simon Bang Terkildsen

11-Sep-11 3:30

Have a look at http://www.javabeginner.com/[^]

Re: hi guys,,

GANESH238911-Sep-11 6:47

GANESH2389

11-Sep-11 6:47

can i get some tutorials and sample projects ?

Re: hi guys,,

Richard MacCutchan11-Sep-11 7:22

Richard MacCutchan

11-Sep-11 7:22

GANESH2389 wrote:
can i get some tutorials and sample projects ?

See The Java Tutorials[^].

Unrequited desire is character building. OriginalGriff

Data stores for Java

oraclepilot7-Sep-11 7:03

oraclepilot

7-Sep-11 7:03

Hi all,

I'm doing a sort of academic work for university and I'm looking for how JPA manages different data stores (I have to compare and contrast this with ADO.NET)...
Does anyone can give me an advide for some docs explain this behavior? I've found only that Java connects to every and only JDBC data sources defining properties for conn. in persistence.xml or using a JNDI connection wherever the JDBC data source is mapper in the application server....

Thanks
Ste

Ste

Re: Data stores for Java

Nagy Vilmos7-Sep-11 7:06

Nagy Vilmos

7-Sep-11 7:06

once you've connected to the DB, the mechanics of storage are down to the database itself. What is being stored is well documented in theJPA specification [links at the end of the page][^]

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

Which is the best editor to use with Java???

Andre' Gardiner5-Sep-11 11:28

Andre' Gardiner

5-Sep-11 11:28

I'm currently learning more about JAVA Big Grin | :-D

and my class is force to used Win-Dos. Confused | :confused:

What is the best editor to used Win-DOS or Textpad and or any other great editor(s) suggestion to write JAVA code? Confused | :confused:

I'm currently 1/2 blind. Suspicious | :suss:

lol So dos isn't cool at all. Sigh | :sigh:

Sir.Dre

Re: Which is the best editor to use with Java???

Firo Atrum Ventus5-Sep-11 15:27

Firo Atrum Ventus

5-Sep-11 15:27

Wow, Java with command prompt!! Sure bring back memories.
My favorite IDE for Java is always NetBeans[^]. But make sure you ask for permission if you want to use NetBeans in class, some basic Java is easier to grasp in command prompt.

Excuse me for my improper grammar and typos.
It's because English is my primary language, not my first language.

My first languages are C# and Java.
VB, ASP, JS, PHP and SQL are my second language.
Indonesian came as my third language.
My fourth language? I'm still creating it, I'll let you know when it's done! Big Grin | :-D

Re: Which is the best editor to use with Java???

Andre' Gardiner7-Sep-11 4:44

Andre' Gardiner

7-Sep-11 4:44

Okay, thanks. will do. Thumbs Up | :thumbsup:

Sir.Dre

Re: Which is the best editor to use with Java???

Nagy Vilmos5-Sep-11 21:54

Nagy Vilmos

5-Sep-11 21:54

For learning Java, I would recommend BlueJ[^]. It was designed specifically for use in education.

Re: Which is the best editor to use with Java???

TorstenH.6-Sep-11 22:04

TorstenH.

6-Sep-11 22:04

use Eclipse - that's the classic one.

regards Torsten
I never finish anyth...

Re: Which is the best editor to use with Java???

expert_babaji13-Sep-11 23:07

expert_babaji

13-Sep-11 23:07

netbean is good editor for java .you can download it from oracle site

Re: Which is the best editor to use with Java???

zealot20621-Sep-11 15:33

zealot206

21-Sep-11 15:33

I would personally go for BlueJ. Smile | :)

It is lightweight and it does not contain too many features that you may not utilize in the long run.

Netbeans is okay. There are tons of features available for you. Furthermore, it has several variation depending on what kind of language that you want to develop your program with. Netbeans is very useful if you want to use several languages.

I am not too sure about Eclipse though. The last time I used it is for testing out the Android emulator.

And all three of them are free! Laugh | :laugh:

Re: Which is the best editor to use with Java???

uspatel22-Sep-11 2:03

uspatel

22-Sep-11 2:03

Eclipse and NetBeans are the best IDE for java.
NetBeans provide good interface like visual studio of Microsoft.

JAVA : need to learn it ASAP

robin7004-Sep-11 21:25

robin700

4-Sep-11 21:25

hey guys I need to learn java asap
I am studying java from this link : http://download.oracle.com/javase/tutorial/
everything given over here is theoretical. I am facing problems in grasping the concepts. Can u suggest me some programs or small projects that will make me learn the language efficiently.

Thanks in advance

Re: JAVA : need to learn it ASAP

Nagy Vilmos4-Sep-11 22:50

Nagy Vilmos

4-Sep-11 22:50

Do you have any programming experience? If so take a small project you've done once and port it in Java.

What are you actually going to do? Java is a huge language and there are many areas. Start off by learning the core system - Standard Edition - as anything you learn there is portable to most of the other areas.

Do you understand OO? The early parts of the Java tutorials are theoretical because they need to be. As well as giving you the language, they are teaching you the theory and there is a lot of theory to take on board.

At the end of the day, if you do choose to go through the Java tutorials, you will get a very good knowledge of the language and it is free. Alternatively, you could buy one of the myriad books on the language.

Re: JAVA : need to learn it ASAP

robin7005-Sep-11 15:58

robin700

5-Sep-11 15:58

hi...yes i have done C++, c# and asp.net before.....i am finding difficulty in theory because we tend to forget when we move forward without making any programs...i have done basics but finding difficulty since interfacing part...please help

Re: JAVA : need to learn it ASAP

Nagy Vilmos5-Sep-11 21:51

Nagy Vilmos

5-Sep-11 21:51

If you've done C# then most of Java should be straight forward.

By interfacing do you mean the concept of design to an Interface?
Unlike C++, Java only supports single-inheritance and interfaces allow a way around that. An Interface is used to define the capabilities of the class, not the function.

LOVE

NADEEM CHHIMPA3-Sep-11 21:17

NADEEM CHHIMPA

3-Sep-11 21:17

NADEEM

Repaint JPanel problem in java

flashery2-Sep-11 5:26

flashery

2-Sep-11 5:26

Hi to all I have a problem in repainting my JPanel. I am creating a ShapeApplication program that can draw a shape on a click of a button. I have different classes in my application.

JPanel1 extends JPanel = use to draw different shape

JPanel2 extends JPanel= use to put my components such as buttons, label, and etc..

JFrame extends JFrame= use to put my JPanel1 and JPanel2

I have also normal classes which I implemented on my own

Shape = my Parent Class

Rectangle extends Shape = subclass of Shape and having an attribute of a Rectangle shape such as height and width

Square extend Shape = subclass of Shape and having an attribute of a Square shape such as height and width

My problem now is that when I use a repaint in actionPerformed method under my JPanel2 which contain my button component there is no effect on my drawing class which is my JPanel1 class

I implemented it this way

JPanel1.repaint();

I initialize my button's ActionListener like this..

button.addActionListener(this);//I am confuse what would be in the parameter.

Can you give a hint on this one? Where do I get wrong?

Re: Repaint JPanel problem in java

twseitex2-Sep-11 10:58

twseitex

2-Sep-11 10:58

Hi,

JFrame is the container of JPanels (Jframe.add(child);)

JPanel1 with own event listener
JPanel2 with own event listener

You must call JPanel1.repaint() in event listener of JPanel 2
You must call JPanel2.repaint() in event listener of JPanel 1

-----------------------------------------------------

referenz_of_button.addActionListener // no action commands, but all action vvents
(
new ActionListener()
{public void actionPerformed(ActionEvent e) // e is placeholder form actionevent type (see Class ActionEvent)
{
// do something ony for object with referenz_of_button
}
}
);

JButton supports ActionListener
JLabel supports ActionListener

JButton and JLabel support MouseListener , KeyListener etc.

----------------------------------------------------

only if you want to use labels (action commands) of buttons

public void actionPerformed(ActionEvent event)
{
String cmd = event.getActionCommand(); // get label of button, label is the action command
if (cmd.equals("label_of_button1"))
{
// do something für button1
}
if (cmd.equals("label_of_button2"))
{
// do something für button1
}
}

referenz_of_button1.addActionListener(this);
// label of button must be "label_of_button1"

referenz_of_button2.addActionListener(this);
// label of button must be "label_of_button2"

JButton supports ActionListener
JLabel supports ActionListener

Re: Repaint JPanel problem in java

flashery2-Sep-11 19:21

flashery

2-Sep-11 19:21

I am confuse about your statement below

JPanel1 with own event listener
JPanel2 with own event listener

You must call JPanel1.repaint() in event listener of JPanel 2
You must call JPanel2.repaint() in event listener of JPanel 1

Can you give me some example on this one just a short code. I really don't get it..

Hi here is my code of my actionPerformed under JPanel2

Java

JPanel1 jpanel1 = new JPanel1();
@Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == btnOK) {

            jpanel1.repaint();

        } 
    }

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