Insert a Row in Excel Using Java Apache POI

I am developing a desktop application related to Excel sheets. I have some problems inserting rows between two rows. Is there any possibility to do this in Java using Apache POI?

Workbook wb3=WorkbookFactory.create(new FileInputStream("Book1.xls"));
Sheet sh=wb3.getSheet("sheet1");

//Reading the available rows using (sh.getRow(1))

//Here i need to insert second row (????)

//I have third row here which already exists (sh.getRow(3))