Login into a page with username text box having id as loginid,password id as password and button id as button.
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;
public class Login {
public static void main(String[] args) throws Exception {
WebDriver driver = new FirefoxDriver();
driver.get("http://");
WebElement id = driver.findElement(By.id("loginID"));
WebElement pass = driver.findElement(By.id("password"));
WebElement button = driver.findElement(By.id("Button"));
id.sendKeys("Cheese");
pass.sendKeys("password");
button.click();
}
}