Minimize the browser:
driver.manage().window().minimize();
Till Selenium 3 there was no method to minimize the screen, we can use the setPosition method to minimize it.
Point p = driver.manage().window().getPosition();
Dimension d = driver.manage().window().getSize();
driver.manage().window().setPosition(new Point((d.getHeight()- p.getX()), (d.getWidth()-p.getY())));
Maximize the browser:
driver.manage().window().maximize();
