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One conveniently uses files in a package by inserting
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at the beginning of a file that needs classes from the mill package
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Then classes in the mill package can be refered to by just using their Classname
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ithout the import command, one must explicitly say mill.Classname
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Packages can be grouped hierarchically, with the corresponding directory tree. For example, the mill package could be a subpackage of agriculture. Then a class is referred to as agriculture.mill.Classname.
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Except for classes provided with the Java language, all of which have the form java.X, a class that is imported or used must either be in the current directory or be accessible to the compiler through the CLASSPATH environment variable.
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