I am a beginner at Java. I want to display an array of objects (of my class) in a Frame. For example, the object has a name field and I want to display the fields's value of all the objects in the array.
Can someone help me find a way to resolve this without necessarily providing code?
Related
Whenever i try to display a two dimensional array object in a diagram using NClass for example it keeps giving me an error saying its invalid declaration, however it doesn't give any error using a 1 dimensional array. Any tips would be appreciated
I have posted a screenshot of the error
enter image description here
It's so difficult to discover what the tool is used in your question. In any way, the same tools support the object description, relations etc. From your screen, I can guess, that your soft don't support java format of description like: "int[][] board" and attribute "protected". I can guess that you need to write only "int[][] board" or only "board" and in its description int[][], but attribute "protected" you need to write in another place.
it is a java code.i have to created a link list but i am having issues in manipulating it. in terms of how to accept any user input in terms of data type be it integer or string. and also how to save several information in one node. and also how to display whats saved in the linked list.
sorry for my English.
While debugging I want to make sure that the Object in use (passed/modified in methods) by multiple threads is the same Object.
As in Java we can not find an object address, how to check if it is the same object? Is there a special way to find that in Netbeans or any other IDE?
When using NetBeans then you can show at the Value in your variables window.
As long as the value is not a primitive datatype the number shows you some type of instance number for the object. As long as the number is the same the objcts are also the same.
E.g.
If the size or something else is shown then you can configure your view by pressing the red marked configuration button.
Create a new Formatter as shown in the next picture (leave the Value code snippet blank) and deactivate the Default Formatter:
I am considering using the following code:
comboBox.addItem(...);
If I continue using this code to add items to the comboBox, would it be possible to save the items into either a text file or memory? *so that it can be loaded in the next time the user wants to use the gui.
Thanks for any help you may provide. :)
Yes, I would recommend creating a class that serializes the object to a text file. This can be accomplished with Input/Output Streams or the File class.
So you would take the array of objects, then serialize the object to a text file, then read it back into the array the next time the program runs.
Here is some info on Serializable: http://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html
File Class: http://docs.oracle.com/javase/7/docs/api/java/io/File.html
I currently use iReport 5.1.0, Tomcat 7, Java, Spring MVC amongs other things.
I believe my current problem lies within the iReport itself, although it may be more complex.
I currently have an Object (Guide),
My Guide has a list of Objects, (itemsGuide)
My itemsGuide has a list of Objects, (itemsTeam)
My itemsTeam has a list of Objects, (professional)
My professional has a name.
My jasper file, receives as parameter the Guide, in the iReport software I must assign the fields and the current variables, although I must print, in a single line, parameters from the itemsTeam object (a couple of strings), and in this very specific case I will always have only one professional, although the variable lies within a list, therefore I must access the first object in this array to then display its attribute.
I keep getting the most unusual errors as I try to do this rather simple process.
The iReport either doesn't find the variables in itemsTeam or the ones in professional, when, for some unknown reason it "works" my preview of the PDF (it says "The document has no pages", to avoid the error msg I change the attribute in my report proprety, but now, it simple shows the iReport file without any field/variable, only the graphical elements).
I am utterly confused, would anyone be so kind as to lend a hand to this poor newcomer?
the JRXML file has over 37k characters and I can't post it as an edit, I uploaded as a txt file insted.
Thanks in advance.
No more need for the link to the xml ~
-- CATURDAY EDIT --
Allright, I seem to be getting closer to my solution.
At this point I've tried quite a few different approaches to my problem.
Although I couldn't completely solve it, I managed to get closer, or so I believe.
Now, all I have to find out (it seems) is:
How to access an array within an array.
I managed my way around the guide and the itemsGuide, I can't access the array within itemsGuide, I need to access a variable named "team" within that array (itemsGuide) and then print the value of a few strings in this array (which is of a specific class, itemsTeam) and a string in an object (professional).
All this, without subreport.
Anyone ?
Allright, what I spent about 4 days trying to find out, my co-worker with more experience than me found out in about 20 minutes.
The issue wasn't within iReports itself, it was necessary to create methods in the class in order to return the desired object/list, something I did not even consider given that I know very little of how iReports (and java honestly) works.
But according to what I understood from what has been done it has something to do with reflection and a couple of methods in the java class.
Thanks guys. :>