Switch between two open windows or browser tabs

The following code demonstrates the SwitchTo() function. A popup window is opened from a main window and then control or focus is switched between these windows. This is particularly useful for when a test calls up a second window or popup and testing continues on the newly opened window. This code also demonstrates the use of an "Iterator".

import java.util.Iterator;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.testng.annotations.BeforeTest;
import org.testng.annotations.Test;

/*-------------------------------------------------------------------------------
Handle tabs and pop up windows

* Note: Selenium will open each tab as a new window just like pop ups. So the same approach is used.
* 1) Get the window id
* 2) Switch to that window
* 3) You can now find elements etc
* This code also demonstrates using the Iterator functionality
-------------------------------------------------------------------------------*/

public class TabbedWindowOperations {
    // Define browser variables here to allow it be public for all annotation to access it
    WebDriver driver;
    Set<String> windowids = null;
    Iterator<String> iter =null;
    String popupWindowid= null;
    String mainWindowId=null;
    String curWindow = null;

    @BeforeTest
    public void  testSetup() {
        driver = new FirefoxDriver();
        driver.manage().timeouts().implicitlyWait(6,TimeUnit.SECONDS);
    } 

    @Test
    public void popupHandling() throws InterruptedException {     
        System.out.println("Handling popup window");
        driver.get("http://hdfc.com");
        windowids = driver.getWindowHandles(); // returns an ID for every opened window
        iter = windowids.iterator();  // iterate through open browser and print out their ids. One id only for now.
        //String mainWindowId = iter.next();
        mainWindowId = driver.getWindowHandle();
        System.out.println("Main window handle: "+mainWindowId);
        System.out.println("List Window IDs. There should be 1 id now");
        System.out.println("================================");

        while (iter.hasNext()){
            //There should be just one item at this point;
            System.out.println("Only one ID at this point: "+iter.next());
        }

        driver.findElement(By.xpath("//*[@id='acc-1-head-2']/a")).click(); // customer care link
        driver.findElement(By.xpath("//*[@id='acc-1-section-2']/li[1]/a")).click(); //write to us link
        //the above should open a new tab on current browser window BUT Selenium will open it as a new browser window
        Thread.sleep(8000L);

        windowids = null;
        windowids = driver.getWindowHandles(); // returns an ID for every opened window
        iter = windowids.iterator();  // iterate through open browser and print out their ids. One id only for now.
        System.out.println("List Window IDs. There should be 2 id now");
        System.out.println("=============================");
        String[] winList = new String[2];   // create an array to store each window id. Need it for later use

        int i=0;
        while (iter.hasNext()){
            winList[i]=iter.next();
            i++;
        } 

        //Print off the window handles. Its a long alphanumeric string
        for (int x=0; x<2; x++){
            System.out.println("Window Number: " + x + " handle = "+winList[x]);
        }

        // Now switch between the open window.
        for (int yy=0; yy<3; yy++){ // do the switching this number of times
            for(int y=0; y<2; y++){ // switch b/w windows 1 and 2
                driver.switchTo().window(winList[y]).manage().timeouts().implicitlyWait(60, TimeUnit.SECONDS);
                if(y==0){
                    curWindow="Main Window";
                } else    {
                    curWindow="Popup Window";
                }
                System.out.println("Switching to " + curWindow + " window... Main window title: "+driver.getTitle());
                Thread.sleep(8000L);
            }
        }
    }
}