list xls sheet names

$KCODE  = 'u'
require 'java'
include_class 'java.io.FileInputStream'
include_class 'org.apache.poi.hssf.usermodel.HSSFWorkbook'


def open_xls(filename)
  input = FileInputStream.new filename
  book = HSSFWorkbook.new input
  input.close()
  book
end

book = open_xls(ARGV[0])
puts (0...book.getNumberOfSheets).map {|i|
  book.getSheetName(i)
}