Java Import

[last updated: 2019-06-14]
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Not completely sure all of the details and situations when this would be used, but best guess is:
If you are using a class in your program that is not in your current directory,
or if the class you need has a package defined,
then you must do it this way:

• Suppose you have a source file that you want to compile, and in that source file
  you will be importing another file located in a different directory.
  In order to compile, javac must be able to find the class you're importing.
• JWID: If both your classes are in the same directory, and they both have the same package defined,
  then setting CLASSPATH to include the path to the directory above the package directory
  will allow javac to find the class you're importing.
  Then, as elsewhere explained, you must move to the directory above the package directory to execute the $ java ClassName.
• If your two packages are in different packages:
  the calling class must list the imported class with it's full package name.
• Also, if you expect to share a variable with a class in a different package,
  you must declare the variable as 'public.'
• As noted, you must be in the directory of the source (.java) file that you want to compile.
  It is NOT necessary for the files that will be imported to already be compiled.
  The javac compiler will compile all of the imported files at the same time.

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