How can you use an Apex class from the hello.apex script - salesforce

Question

How can you use an Apex class from the hello.apex script in a newly created standard project with VS Code?
This is probably really simple, I thought I should use some 'using' or 'include' statement but I cannot find the information. This is what I did:
I am working from VS Code.
sfdx create project.
chosen: Standard.
In the directory scripts/apex I open the file hello.apex.
Log in to org, vscodeOrg.
sfdx Execute Anonymous Apex with Editor contents, this succeeds.
sfdx Create Apex Class, called NewClass with static function
right under the constructor I add a static method, the complete class code is now:
public with sharing class NewClass {
public NewClass() {
}
public static void Test() {
System.debug('call from apex class');
}
}
The file is located in: ...\NewStandardProject\force-app\main\default\classes\NewClass.cls
Go back to hello.apex, execute still succeeds.
I add in the hello.apex file:
NewClass.Test();
Making the script code this:
string tempvar = 'Enter_your_name_here';
System.debug('Hello World!');
System.debug('My name is ' + tempvar);
NewClass.Test();
The editor gives me 'Intelligent code completion', so it seems my new class is known.
I try to execute again with 'Execute Anonymous Apex with Editor contents', it fails with this feed back:
Error: Variable does not exist: NewClass
If I replace the static call with e.g.
NewClass nc = new NewClass();
It gives the same error.
If I replace public with global in NewClass, that also does not help.
What am I doing wrong here?

Answer 1

Answering my own question then to make this complete:
Install sfdx
Install vs sfdx plug in
Press Ctrl-Shift P to call the sfdx from vs code
sfdx create project -> Standard
In the directory scripts/apex, open the file hello.apex
Log in to org, vscodeOrg (or if you have no standard org yet call control shift p, sfdx create a default scratch org)
sfdx Execute Anonymous Apex with Editor contents, this succeeds
sfdx Create Apex Class, called NewClass with static function
right under the constructor I add a static method, the complete class code is now:
public with sharing class NewClass {
public NewClass() {
}
public static void Test() {
System.debug('call from apex class');
}
}
In the left pain click on the file in the project directory and choose 'sfdx deploy source to org'.
(And that step as a developer customed to working with local executables, I forgot).
Add in the hello.apex file: NewClass.Test();
Making the code there:
// Use .apex files to store anonymous Apex.
// You can execute anonymous Apex in VS Code by selecting the
// apex text and running the command:
// SFDX: Execute Anonymous Apex with Currently Selected Text
// You can also execute the entire file by running the command:
// SFDX: Execute Anonymous Apex with Editor Contents
string tempvar = 'Enter_your_name_here';
System.debug('Hello World!');
System.debug('My name is ' + tempvar);
NewClass.Test();
I try to execute again with 'Execute Anonymous Apex with Editor contents'.
In the output amongst a few other lines you should see: 'call from apex class'.