If you're looking how to pick username and passwords or any data from an excel sheet then below steps will help you out:
1) Download J-Excel jar (What is J-Excel), you can get the path to download J-Excel jar by clicking here
2) Now, add this jar to your build path. You can look for the steps.
3) Create a new class and add below code:
public class Excel {
static Sheet s ;
public static void main(String[] args) throws BiffException, IOException {
FileInputStream fis = new FileInputStream("C:\\Users\\DELL\\Desktop\\r.xls");
Workbook w = Workbook.getWorkbook(fis);
s = w.getSheet(0);
for (int i=0; i<=s.getRows(); i++)
{
String username = s.getCell(0, i).getContents();
System.out.println(username);
String username1 = s.getCell(1, i).getContents();
System.out.println(username1);
}
}