import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.ss.usermodel.Workbook;

public class Sample1_1{
  public static void main(String[] args){
    HSSFWorkbook wb1 = new HSSFWorkbook();
    XSSFWorkbook wb2 = new XSSFWorkbook();

    Workbook wb3 = new HSSFWorkbook();
    Workbook wb4 = new XSSFWorkbook();
  }
}