your webcam can record you live without you knowing it

Since 2008, it's been known that certain older Java software, manufactured by Oracle, can allow strangers to view you through your webcam, whether you know it or not.
The one way to tell if you're being spied on through your webcam, is if the webcam light mysteriously comes on, when you're not using the program.
The only way to be certain that you are not being viewed live through your webcam, is to place a postit or other object over your webcam when you're not using it.
Placing something over the camera however does not prevent people who have hacked into your webcam software from hearing your conversation.
Yes...........
Hackers can do that too.