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Ok, now you need to figure how to configure Eclipse to use the jar file.

Ok, that would say the jar file and the source file are fine.

Now you need to figure out how to make it work in Eclipse.


Why do you have a folder name with the source filename?
Is there a...

Is that inside of the Eclipse program? I don't use Eclipse and don't know how to configure it.
That was the reason I suggested the use of the javac command with the -cp option in a command prompt...

That should work if:
the folder with the javac.exe file is in the PATH
the NoobChain.java file is in the current folder
there are no third-party classes used in the java source file

Can you...

Is there a jar file with that contains that package? Use any zip file utility to view the contents of the jar file. If needed, rename the jar file by adding .zip to the end of the filename so that...

Note: Only the command should be in "s not the options and filename:
"C:\Program Files\Java\jdk1.8.0_201\bin\javac.exe" -cp . -Xlint -Xdiags:verbose NoobChain.java


Please copy the full contents...

To help the OS find a command, add the path to the folder containing the command to the PATH environment variable.

How does it do that? The proof of correctness is when the OS finds the command...

Is the spelling of the path used on the import statement correct? Java is case sensitive.

Try using the commandline statement I gave earlier to see if the javac command finds the class when given...

The jar files containing the classes being imported must be on the classpath when the javac command is executed so the compiler can find the definitions for the classes.
Do some research on how to...