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Some slightly incorrect statements:

There can be more than one class defined in a .java file and none of the names of the classes have to match the name of the .java file. The standard is that...

It is a class with one static method.

the primary function of the HelloWorld.class file is to define a class.
A minimal class, but still a class.

.class files are the output from the javac compiler when it compiles a .java source program.
They do define classes. Their contents are in byte code vs text and are not meant to be read with an...