Sheet sheet1 = workbook.createSheet("sheet1");
Sheet sheet2 = workbook.createSheet("sheet2");
workbook.createSheet("sheet3");
RichTextString rts = workbook.getCreationHelper().createRichTextString("hello world");
sheet1.createRow(0).createCell((short)0).setCellValue(1.2);
sheet1.createRow(1).createCell((short)0).setCellValue(rts);
sheet2.createRow(0);