Question: I'm trying to create a new sheet in an existing excel workbook using apache POI for java but have been unsuccessful so far. Can anyone please tell me how it is done?

Answer: 
It's very easy. It's just like adding a new sheet to a new workbook, only you start with the existing workbook rather than a new one

```
 Workbook wb = WorkbookFactory.create(new File("/path/to/existing"));
 Sheet s = wb.createSheet();

 // Do something with the new sheet

 FileOutputStream out = new FileOutputStream("/path/to/new/version");
 wb.write(out);
 out.close();

```
```
HSSFSheet sheet1= workBook.createSheet("sheet1");
HSSFSheet sheet2= workBook.createSheet("sheet2");
HSSFSheet sheet3= workBook.createSheet("sheet3");

```