Develop Reference

How to move a JFrame file inside a folder to another folder in netbeans 13?

I want to use my "Final_Frame.java" in my "SampleFrameProject.java", sort of like interconnecting it by creating a "Final_Frame" object and then typing the "this.show()".
However, an error message appears, saying that "package com.toedter.components does not exist." That is the only error I've seen; I'm confident that my "Final Frame.java" is functioning well before I copy-paste it, hence I knew the issue was caused by my copy-pasting.
Btw all of the error is pointing to JCalender, and JComponents, I'm pretty sure I followed the instructions while installing them. They are working just fine before I move the "Final_Frame.java", but after I move it, it began to show errors. So is there any way for me to copy-paste it correctly? or are there any methods to call "Final_Frame.java" inside my "SampleFrameProject.java" without copy-pasting?
Thank you in advance!

package is a fundamental concept in Java. It is nothing but a namespace for the Java source file, reflecting the directory (folder) structure of your project after the src/main/java directory.
package is usually defined at the first line of the file. For example, given the directory structure from your root directory mavenproject2, the directory structure inside if it is src/main/java/com/foo/bar/FinalJava.java, then the corresponding package defined will be
package com.foo.bar;
// imports
public class FinalJava {
// the content of class
}
For your case, it would seem that you have copied com/toedter/components/FinalFrame.java from the Hotel_Management_System project (which already has defined a line package com.toedter.components in the file) to another project mavenproject2 which has a different directory structure (which is not clear in your question).
The solution would be to modify the package line according to your directory structure then it would solve the error.
Personally, I would suggest to learn some basics in Java, take some tutorials, or at least write some simple Java console applications before diving into GUI applications.

Declaring packages in eclipse

I'm new to java and eclipse and was wondering if someone could help me.
In my comp class we have a lab each week so in eclipse I created a folder called "compClass" in this file is the "src" folder and in that folder are 3 packages. lab1, lab2, lab3, one for each week we have an assignment. We're currently on assignment 3 so I'm using "lab3" package. In this package I have 2 files, "Test.java" and "MyInteger.java". These files were given to the students and we are supposed to modify them, however that's not my issue.
My issue is on those files I keep getting a compiler error that says: The declared package "" does not match the expected package "lab3" I'm not sure why this is happening as I didn't import anything. I created new java files and copy pasted the code in from a text file. I even tried typing it out by hand and got the same error. I tried dragging and dropping the "Test" and "MyInteger" files (as java files not text files) from a folder on my desktop to the "lab3" package and got the same error. How can I fix this?
P.S. On this post: https://stackoverflow.com/questions/7628686/eclipse-the-declared-package-does-not-match-the-expected-package/13444301#:~:text=java%20files%20to%20%22package%20path,All%20should%20be%20ok.&text=If%20you%20have%20imported%20an,the%20error%20till%20you%20restart.
The top answer said to find the src/prefix1 directory and right click on it. Then build path and use as source folder. If that is the answer then could someone please help me find the "src" directory I don't even really know what that is or where to find it.
Thank you!

Every Java project has a project root which can be configured using your IDE. In your case, the root is src/. If your code is inside a subfolder in the root, this folder represents the package your code belongs to, so in this case it's a package of lab3. If you want to not include any package declarations, then either place the code directly inside src or set lab3 as the root.

Trouble Understanding/Locating a Jar file (JIDT package) needed for Octave to Java Array Conversion

In this previous question, I was trying to rework some Matlab code and figure out a package called javaplex to be compatible with Octave; it uses Java, but is tooled for Matlab, hence that issue. Now in an interval of time, I was busy/running simulations, and hadn't gotten around to a final step - actually using the package, with most all of the difficulties worked out. It turns out that another step exists: I need to convert an Octave array to a Java array (although I'm not sure why this issue didn't come up in Matlab).
To do so, I have turned to this script, in which the comments indicate that when using it, it
Assumes the JIDT [Java Information Dynamics Toolkit] jar is already on the java classpath - you will get a java classpath error if this is not the case.
So I go to the JIDT GitHub page and download this package. Now I am not a very avid user of java, so I believe I am failing to see something fairly straightforward: I am not sure where the "JIDT jar" is that is referenced in the above block quote! I can't find such a particular jar file to put in Octave's java classpath. In this tutorial for JIDT, they say you need the "infodynamics.jar" file in the classpath (page 9). I'm not sure what jar file I should be looking for, and where. Any help understanding the nature, name and location of this jar file (within the infodynamics toolkit folder) would be appreciated!
As an inevitable follow-up question, because this will come up upon resolving this issue, I would like to clarify the following procedure is how to add a jar file to the Octave (static) java classpath (following this answer here, I wasn't sure if I was implementing correctly):
I create a file called "javaclasspath.txt" inside of the directory I use in Octave.
I enter the name of files as follows: "./path/to/your-file.jar"
I suppose my main issue here is where do I start the path (all the way back with "C:/..."?), and do I put this "javaclasspath.txt" file in the directory folder I will be using most of the time in Octave?
Edit: I cannot find "infodynamics.jar" as shown here:

The JIDT jar is named infodynamics.jar and it is located in the root of the downloads infodynamics-dist-1.4.zip file.

Not stopping at eclipse debug point

I am new to java,i have setup eclipse java project.I have a set of classes in jars in a folder.I have also got the java files associated to those classes downloaded (i cant compile those java files,its just to read and debug at runtime).My issue is class files are packaged in a different way than the those what appears in java file.
eg:- ABC.java is structured as platform\src\main\java\com\subplatform\sql\ABC.java
But package declared in java file if i open is
com.subplatform.sql;
I think this is the reason the debug point is not getting honored.In the previous version's of this product
java files used to be structured as
src\com\subplatform\sql\ABC.java
Thus it used to stop at the debug point.
Thanks

Rename all the package information that contains package com.[restOfPackageInfo] to be package java.com.[restOfPackageInfo] and you should be all set. (Also, if there are any import statements, you'll need to add java in front of com there too.)
There's your problem:
Originally the file structure was "src\com\subplatform\sql\ABC.java"
But by creating a folder called java and placing the com folder inside, you're changing the path to be: "src\main\java\com\subplatform\sql\ABC.java"
So, essentially in the ABC file you see package com.subplatform.sql;. This is information that the compiler uses to compile the class. So you're compiler looks for a ABC.java in src with path com.subplatform.sql but there is no such folder.
Also, read up on packaging.

It sounds like your source attachment path is wrong and should point to platform\src\main\java\ instead of the project itself.
A debug point not being honored can mean two different things.
1) The debugger isn't stopping on line breakpoints. If the compiled class files don't have line and debug information, the JVM doesn't know when it's executing those lines and will not stop there. You should still be able to stop at method entries and when exceptions are thrown. Either way, your are always required to launch your application using Debug instead of Run.
2) The debugger is stopping, but the source is not found. For a JAR file, you should have the properties of the JAR's entry on the Java Build Path point to a location where the source files exactly match the layout of the jar so that com/novice/to/sql/MyClass.class has a com/novice/to/sql/MyClass.java relative to where ever the source attachment points. If the top level contents of the JAR file contains entries like "com", "org", and "net", that's what should be in the top level of the source directory or archive you're pointing to.

Getting resources works from NetBeans Execution Context but not working when jar is executed from comand line

I have a code where i create Java Actions and try to associate Icons with them. One snapshot of code is
FileOpenCommand fileOpen = new FileOpenCommand(this);
fileOpen.putValue("ImageOnly", false);
fileOpen.putValue(Action.NAME, "Open");
fileOpen.putValue(Action.SMALL_ICON, new ImageIcon(getClass().getResource("../resources/File-Open-icon24x24.png")));
fileOpen.putValue(Action.SHORT_DESCRIPTION, "Opens the existing file.");
fileOpen.putValue("Group", "File");
fileOpen.putValue(Action.ACCELERATOR_KEY, KeyStroke.getKeyStroke(KeyEvent.VK_O, ActionEvent.CTRL_MASK));
this.commands.put("FileOpen", fileOpen);
The accent is on the line where I try to set the Action.SMALL_ICON property to the action. This works when executed in NetBeans environment either in debug or release mode. But when I've tried to execute jar file from the command line, it fails with exception.
Any idea? Anything to do with classpath? Resources folder is put as the package inside the main package.
Thanks in Advance!

I'm not entirely sure what exception is being thrown in your case, although assuming it is a NullPointerException, IOException, or IllegalArgumentException deriving from
fileOpen.putValue(Action.SMALL_ICON, new ImageIcon(getClass().getResource("../resources/File-Open-icon24x24.png")));
Your issue should be resolved simply by adding getClassLoader() between the getClass() and getResource(), like so:
fileOpen.putValue(Action.SMALL_ICON, new ImageIcon(getClass().getClassLoader().getResource("../resources/File-Open-icon24x24.png")));
Additionally, you must be exact in your filenames, specifically the extension. In this case, you are accessing File-Open-icon24x24.png, which will work perfectly fine regardless of whether the actual file is extended by png or PNG within Netbeans, but once exported the extension case matters.
Lastly, if neither of those changes resolve your problem, I would check your filepath, as there is most likely a logical error somewhere down the line.
When using embedded resources in Netbeans, you should have a resources folder containing additional folder or whatever data you need, which you seem to have, but this folder should be located inside the Netbeans project's src folder. getClass().getResource() returns the directory at the top of the package line, meaning if your class package is com.example.code, then the compiler will look for files/folder on the same level as com. Opening the Netbeans src folder you should see the initial com folder. Your resource folder should be placed directly next to that folder, as then it will be properly embedded in the jar file export.
In your code your path is ../resources/File-Open-icon24x24.png, which confuses me as to why you begin with ... I cannot see your folder structure so I cannot give a precise answer on this note, but you may be accessing the wrong location, although I feel like you are not as you said your project runs correctly within Netbeans. However, your resource files may not be correctly encoding into the jar file due to placement as mentioned. To test what your jar file actually contains, make a copy of it (for safety reasons) and change the file extension from jar to zip. You can then look through its contents in Windows Explorer, and see its directory structure. Another debugging trick for folder structures is to create a text file at the URL you are trying to access to see where it is placed.