Zoom to selection Hotkey
Just a simple keyboard command that fills the screen with whatever you have selected.
Matt Wilkie commented
This feature is still not available in May 2021. The completed tag is false.
See https://graphicdesign.stackexchange.com/a/99417/8980 for a workaround using Actions.
Ivan Sablaev (Sahba) commented
This option is still NOT in illustrator as of May 2020, Neeraj's COMPLETED tag is utter nonsense. You want to select an object and press a key combination so that object becomes the center of the screen AND FILLS the screen. He most likely never used illustrator for creation as an artist and either didn't read your request or didn't understand it. He is referring to the stupidest zoom created ever which is ZOOM TO CENTER. I call it stupid because it is actually only zooming 50% of the current zoom level AND sliding the center of selection to the center of the screen. There is a Fit all in window which only works for multiple artboards. There used to be such feature; I believe illustrator 4 came out with it but was taken out.
Anyway, there is a way to make a script to do this and here is the link for it. http://www.wundes.com/JS4AI/
You can use it on either Mac or PC.