Does Berkeley believe that objects go out of existence when nobody is perceiving them? If not, what does he believe?

No. Berkeley believed that a belief that something exists is justified if and only if the object at issue can be perceived by someone or something, and if so, then the object must be just a collection of ideas; ideas that we all collectively perceive to be true and real. Therefore, we must accept the fact that there are no material objects and just a collection of ideas, which made Berkeley an immaterialist. According to Berkeley, only ideas that we perceive directly are real.
Berkeley maintained that objects exist only in the minds of those that perceive them. His main point was that o…