Working with Frames

java.util.List<WebElement> f = driver.findElements(By.tagName("iframe")); 

            System.out.println(f.size());

             if(f.size()>0) { 

                   for (WebElement frameid : f){ 

                         

                         if(frameid.getAttribute("id").equals("frame_name"))

                         {

                         

                              driver.switchTo().frame(frameid);

                             

                         }

}

}