code: public ClassDoc[] allClasses(PackageDoc pkgDoc) {
            return pkgDoc.isIncluded() ?
                  pkgDoc.allClasses() :
                  getArray(allClasses, Util.getPackageName(pkgDoc));
        }
docs: Return all of the classes specified on the command-line that
  belong to the given package.
  @param pkgDoc the package to return the classes for.