http://www.jaxio.com/2013/09/30/les-bonnes-pratiques-tests-selenium.html

login.java

public class LoginPage {
    @FindBy(id = "j_username")
    public WebElement user;
    @FindBy(id = "j_password")
    public WebElement password;
    @FindBy(id = "login")
    public WebElement loginButton;
    
    public void login(String userValue, String passwordValue) {
        user.clear();
        user.sendKeys(userValue);
        password.clear();
        password.sendKeys(passwordValue);
        loginButton.click();
    }
}