How to return from the iframe to the main page to work with the main elements of the page - using selenium webdriver

Question

I used Driver.switchTo().frame("XXXXX"); to go to the iframe on the main page

Now I want to return to the main page to work with other operations using selenium webdriver

I tried to get window handles

but i cannot get the iFrame window handle

Answer 1

 driver.switchTo().defaultContent();