How can I send keyboard shortcut Alt + Shift + Z (hotkey) with Selenium 2?

Try it:

SendKeys.SendWait("%+z")

Assuming you're using JavaScript,

Keys.chord(keys)

Also, the documentation is at https://www.selenium.dev/documentation/en/

Apart from the Keys.chord(Keys.ALT, Keys.SHIFT,"z"); method as suggested in the other/accepted answer, I would suggest you try the Robot framework for using keyboard shortcuts.

You can do something like;

Robot robot = new Robot();
Thread.sleep(1000);
robot.delay(3000);


robot.keyPress(KeyEvent.VK_CONTROL);
robot.keyPress(KeyEvent.VK_Y);
robot.keyRelease(KeyEvent.VK_CONTROL);
robot.keyRelease(KeyEvent.VK_Y);

I guess this would help sort your problem.