package
statement as the first statement in the source file that contains the
type (class, interface, enumeration, or annotation type).
To use a public type that's in a different package, you have three choices: (1) use the fully qualified name of the type, (2) import the type, or (3) import the entire package of which the type is a member.
The path names for a package's source and class files mirror the name of the package.
You might have to set your CLASSPATH
so that the compiler and
the JVM can find the .class
files for your types.