How to resize current browser window in Selenium WebDriver with Java?

Question

I need to resize the browser as 300x400 during executing the Selenium automated tests. How can I resize the browser window in Selenium WebDriver (aka, Selenium 2) with Java?

Answer 1

For Responsive Design it's better if you don't use fixed data, in this case screen resolution - users need most often (cause it's much less prone to errors) :

_driver.manage().window().maximize();

or

_driver.manage().window().fullScreen();