I'm using apache poi to create an excel document. To create new sheet in workbook I write next code:

```
Workbook wb = new HSSFWorkbook(); 
Sheet sh = wb.createSheet();

```

this code create and add sheet to workbook. But I want to create sheet formerly and then add it to workbook. Smth like this: 

```
Sheet sh = new HSSFSheet();
wb.addSheet(sh);

```

I need such thing, because I want to copy data from one sheet of one workbook to another sheet of another workbook(Workbook interface has method `Sheet cloneSheet(int)`). But Workbook interface doesn't have method like addSheet(Sheet sh). 
Also HSSFWorkbook is final class so I can't extend it to implement add method
How can I do this?