Get another J-1 while one is still active [closed]

I'm European, not under the "two years residency" requirement and am currently doing an internship for one year under a J-1 visa.

Is it possible to cancel it to start another internship elsewhere before the first one expires?

For instance, starting a J-1 short-term scholar in another company before the first visa expires?

Otherwise, from what I understand there is a three month delay between two J-1 visas. Let's say I've got six months left with my current visa.

Is it possible to cancel my current J-1, return to my country for three months and get a new J-1?

Is there any other option than the J-1 visa for a short term internship?