public static ArrayList<Object> getDataFromExcel() throws EncryptedDocumentException, InvalidFormatException, IOException
{
    ArrayList<Object> al=new ArrayList<Object>();
    FileInputStream fis=new FileInputStream("E:\LoginData.xlsx");
    Workbook wb=WorkbookFactory.create(fis);
    Sheet sh=wb.getSheet("Logins");
    Row rows=sh.getRow(0);
    Cell cells=rows.getCell(0);

    for(int rowCount=0;rowCount<sh.getLastRowNum();rowCount++)
    {
        String username=sh.getRow(rowCount).getCell(0).getStringCellValue();
        String password=sh.getRow(rowCount).getCell(1).getStringCellValue();

        Object[] ob={username,password};
        al.add(ob);

    }
    return al;

}

WebDriver driver;

@BeforeMethod
public void setUp() {
    System.setProperty("webdriver.gecko.driver",
            "E:\All_JARs\geckodriver.exe");
    driver.get("https://www.facebook.com");
    driver.manage().window().maximize();

}

@Test(dataProvider = "fetchDatafromExcel")
public void loginTest(String username, String password) {

    driver.findElement(By.xpath("//input[@type='email']")).sendKeys(
            username);
    driver.findElement(By.xpath("//input[@type='password']")).sendKeys(
            password);
    driver.findElement(
            By.xpath("//input[@data-testid='royal_login_button']")).click();

}

@DataProvider(name = "fetchDatafromExcel")
public Iterator<Object> fetchDatafromExcel()
        throws EncryptedDocumentException, InvalidFormatException,
        IOException {
    ArrayList<Object> testdata = ExcelUtilites.getDataFromExcel();
    return testdata.iterator();

}

@AfterMethod
public void tearDown() {
    driver.quit();
}

public class Credentials {

    private String userName;
    private String password;

    public Credentials() {  }

    public Credentials(String userName, String password) {
        this.userName = userName;
        this.password = password;
    }

    public String getUserName() { return userName;  }

    public void setUserName(String userName) { this.userName = userName; }

    public String getPassword() { return password;  }

    public void setPassword(String password) {  this.password = password; }
}

@Test(dataProvider = "dpit")
    public void f(Credentials cred) {
        System.out.println(cred.getUserName());
        System.out.println(cred.getPassword());
    }

    @DataProvider(name = "dpit")
    public Iterator<Credentials[]> createData() {

        Credentials[] s1arr = {new Credentials("hello", "hellopass")};
        Credentials[] s2arr = {new Credentials("bye", "byepass")};

        List<Credentials[]> sm = new ArrayList<>();
        sm.add(s1arr);
        sm.add(s2arr);

        return sm.iterator();
    }