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Setting classpath enviroment variable value globally

I want to be able to execute a java class from Command Prompt in windows without specifying the classpath explicitly every time I want to execute a java class, for example like this
where I execute the HelloWorld class in the "ExamplePackage" package.
I want to accomplish the same result without specifying the classpath, as follows
but this gives me an Error: Could not find or load main class HelloWorld. As I understand it, this error is caused by java not being able to locate the class since classpath has not been specified.
Now, I want to solve this problem by setting a global variable classpath value to C:\Users\UpdatusUser\Desktop\ExampleProject.
This can be accomplished, as I understand, over here
But that does not seem to solve the issue, since I still get the following result if I now use java ExamplePackage.HelloWorld
What am I doing wrong?

For a full explanation see this:
What does "Could not find or load main class" mean?
The short answer is execute the java command from the ExampleProject folder not the ExamplePackage folder.

Issue running java program from batch file, runs fine in IDE

I'm doing some basic java homework for a class on my new laptop - issue is, I can't seem to get the program to compile and run from my batch file using the directions the instructor gave me.
I've set the Path variable to my JDK inside the Environment Variables settings.
My program is a simple shipping program to keep track of shipment information - I have the program working flawlessly in NetBeans (which our instructor advised us to use for developing the code), but he's going to be testing them using batch files, so we're also advised to test them on our systems with one we create prior to turning them in - pretty straightforward.
Issue is, I cannot seem to get this to work. I've never done it before, but I've used .bat files to compile and run C++ programs, as well as using makefiles on a unix system, so I feel like I'm absolutely stupid for not figuring this out on my own, but none of my searches have returned any fruitful solutions that help at all.
My program consists of 3 .java files:
Shipment.java - an interface that contains abstracted methods that are implemented in the ShipmentHW1 class
ShipmentHW1.java - a class that implements the abstracted methods from Shipment and has constructors, etc to create a usable object
TestShipment.java - the main class of this program, which utilizes and creates ShipmentHW1 objects based on preset parameters. This is super duper basic stuff here, and again, it runs perfectly fine inside the NetBeans IDE.
The instructions given to us state to have the batch file inside the package directory (which in this case I've set aside a seperate folder on my desktop titled "shipping", which is the package name - shouldn't be any issues there), where the 3 .java files are located as well.
They say if you don't need to explicitly list the path to the JDK, then you can simply have
javac TestShipment.java
java TestShipment.java
pause
Afterwards I get errors talking about how it "cannot find symbol Shipment s = new ShipmentHW1();"
I've tried adding imports, but since they're in the same package it shouldn't even be an issue.
Directory path is
C:\Users\X\Desktop\shipping
All 7 files are contained within:
TestShipment.java
TestShipment.class
Shipment.java
Shipment.class
ShipmentHW1.java
ShipmentHW1.class
doHW1.bat
Does anyone have any idea? I can provide more information if I've been too vague
Also, I'm on Windows 8 if that makes any difference

Solved
Batch file now reads
javac TestShipment.java Shipment.java ShipmentHW1.java
cd ..
java shipment.TestShipment
pause
and it works like a charm. Anyone have any ideas why I had to call the package.class instead of just compiling it regularly?

Try doing
javac TestShipment.java
java TestShipment
pause

Without seeing the contents of TestShipment.java, I'll assume you have some dependency on the Shipment and ShipmentHW1 classes. As such, when you execute a program that uses the TestShipment class, you need to have the .class files for each of the three (and any other dependencies).
So you will have to compile Shipment.java and ShipmentHW1.java as well before running your java command. If they are in the same package, you're good, if not, you will have to specify an appropriate value for the -cp option.
When running java with a class name, you need to specify the fully qualified class name.

If your .java files are declared to be in the 'shipping' package, then you probably need to be running java from the parent directory of 'shipping', e.g.
cd <path>/shipping
javac TestShipment.java
cd ..
java shipping/TestShipment

Java error: Could not find or load main class memoryarray.MemoryArray

I have a java program where I got the following error:
Error: Could not find or load main class memoryarray.MemoryArray
Java Result: 1
What does the error mean?

You are reading the error incorrectly; your error does not match your question. There is a problem finding the main method within your class (this may be due to the possibility that it isn't defined in the class that you are trying to run), or simply an error loading your class.

The possible ways to resolve this error
Step 1: Check the .java file name and the class name you defined in the java file.
Step 2: If you are running from the command line, check the class name with out having any typo mistakes.
Step 3: Check whether the class which you are running in CLASSPATH

NoClassDefFoundError and Could not find or load main class

I am using the code from Rome's tutorials page http://wiki.java.net/twiki/bin/view/Javawsxml/Rome05TutorialFeedReader . Also trying this one: http://wiki.java.net/twiki/bin/view/Javawsxml/Rome05TutorialFeedReader
Compiling works, but I'm not sure how to run these examples. Why I just type java FeedReader or java FeedAggregator into the command line, I get the error:
C:\projects\freshmeat\src>java FeedAggregator http://freecode.com/?format=atom
Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/syndication/f
eed/synd/SyndFeed
plus the large block that follows this error
Why is this happening, how do I fix it and try these things out? How do I get something to work with Rome!?

You need to include rome in the runtime classpath (in addition to the compile-time classpath)
java -classpath lib/rome.jar FeedAggregator ...

The samples you are trying to run are in the package com.sun.syndication.samples. You say you are a complete beginner, so, to make things simpler, I would recommend that you remove the line beginning with package in each of FeedReader.java and FeedAggregator.java. Recompile the classes after removing their package directives.
Then, to run these classes, make sure you're in the same directory as the class files FeedReader.class and FeedAggregator.class that javac created. Then, try running:
java -cp c:\projects\freshmeat\libs\rome-1.0.jar;c:\projects\freshmeat\libs\jdom-1.0.jar;. FeedReader
(and similarly for FeedAggregator.)
Note also that I've added the current directory, ., to the -cp attribute. Without this, the Java virtual machine won't know that it has to look in the current directory to find your FeedReader and FeedAggregator classes.
If you were to reinstate the package directives, you'd find the class files FeedReader.class and FeedAggregator.class would be created inside a directory com\sun\syndication\samples when you compile their sources. To run the class files from this location, you'd use a command line such as
java -cp c:\projects\freshmeat\libs\rome-1.0.jar;c:\projects\freshmeat\libs\jdom-1.0.jar;. com.sun.syndication.samples.FeedReader
and you'd run this from the directory containing the com subdirectory, not the directory that contains the class files.
More information on packages in Java can be found here.

Using a taglet with Javadoc in Netbeans

I've written a custom taglet, compiled it and am now trying to use it but keep getting a ClassNotFoundException when I try to run it with javadoc:
javadoc: error - Error - Exception java.lang.ClassNotFoundException thrown while trying to register Taglet proj2.javadoc.CustomTaglet...
In netbeans under the documentation I've specified the following arguments:
-taglet proj2.javadoc.CustomTaglet -tagletpath c:\
I've put the class file in C:\ (for now at least) and I've triple checked the class name but I'm still getting the exception. Is there something I'm missing here?

You should put class files in a path matching their package name. So netbeans/javadoc is looking for your CustomTaglet.class in c:\proj2\javadoc