Hi,
I m new to Web driver.As of now i m asked to automate an application ,im stuck in between.
For the login screen, i would like to input the values for username and password through an excel sheet.
The below is the code where i give static values for the username and password

public void login() throws InterruptedException
  {
    boolean a;
   
    String fileNameRead = "C:\\testPOIRead.xls";
    System.out.println(admin);
    driver.findElement(By.id("UserName")).sendKeys("admin");
    driver.findElement(By.id("Password")).sendKeys("password");
    driver.findElement(By.id("Submit")).click();
     WebElement ans1= driver.findElement(By.id("lblLogin"));
     String ans2 = ans1.getText();
      Boolean ans="Welcome User".equals( ans2);
       writeDataToExcelFile(fileName,v1) ;
       readDataToExcelFile(fileNameRead);
   
  }

Instead of giving the actual username and password,i would like the values to be fetched from and excel sheet and then get it executed.I have no idea how to write a function and to call in the above code.
If anyone have experience in this,please share any good site where i can understand concept needed for automating the site using Web driver

Need a smal structure on that...... i wasnt successful in creating the function and calling it

the java file is great..Can u plz tel me which is the function  to write data to excel sheet?