How to switch among Browser Windows?

While we are performing the automation test execution, we may need to handle another browser windows.  For example, if you want to open the hyperlink in new different window and then need to enter some inputs using sendKeys() method or to perform some other actions, we can switch to the newly opened window and you can come back to the previous window in the browsers.

Java API Syntax : WebDriver.TargetLocator switchTo()

I have used the below code to switch among the browser windows.

Code:

import java.io.File;  
import java.io.IOException;  
import org.apache.commons.io.FileUtils;  
import org.openqa.selenium.By;  
import org.openqa.selenium.OutputType;  
import org.openqa.selenium.TakesScreenshot;  
import org.openqa.selenium.WebDriver;  
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;  

public class SwitchBrowserWindow {  

public static void main(String args[]) throws IOException, InterruptedException
{
WebDriver driver = null;  

driver = new FirefoxDriver();
driver.get("http://www.microsoft.com/en-us/privacystatement/default.aspx");
String winBrowser_1 = driver.getWindowHandle();
System.out.println("First Window Handle is: "+winBrowser_1);
WebElement link = driver.findElement(By.id("psp_microsoft_services_agreement"));
link.click();
  
String winBrowser_2 = driver.getWindowHandle();
Thread.sleep(10000);
System.out.println("Second Window Handle is: "+winBrowser_2);
System.out.println("Window Handles Count "  +driver.getWindowHandles().size());
Thread.sleep(5000);
driver.switchTo().window(winBrowser_1);
}
 }