Web Driver - Handling Multiple Windows

package script;
import java.util.Set;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebDriverBackedSelenium;
import org.openqa.selenium.firefox.FirefoxDriver;


public class HandlingWindows  {
    public static void main(String[] args) {
        WebDriver driver = new FirefoxDriver();
        WebDriverBackedSelenium selenium = new WebDriverBackedSelenium(driver, "http://www.way2sms.com/");
        driver.get("http://www.way2sms.com/");
        selenium.windowFocus();
        selenium.windowMaximize();
        driver.findElement(By.xpath(".//*[@id='header']/div/div/div[2]/a")).click();
        selenium.waitForPageToLoad("30000");
        System.out.println("Page title is: " + driver.getTitle());
        driver.findElement(By.id("username")).click();
        Set allWindowHandles = driver.getWindowHandles();
        String window0 = (String) allWindowHandles.toArray()[0];
        System.out.println("Window0 String: "+ window0);
        driver.switchTo().window(window0);
        String win0Title = selenium.getTitle();
        System.out.println("Window0 Title: "+ win0Title);
        String window1 = (String) allWindowHandles.toArray()[1];
        System.out.println("Window1 String: "+ window1);
        driver.switchTo().window(window1);
        String win1Title = selenium.getTitle();
        System.out.println("Window1 Title: "+ win1Title);     
     }
  }