What collection - each spliterator operation iterates over?

Question

I am trying to understand what exactly happens with each iterator of the operation. Please correct me if I'm wrong: (I'm most likely wrong)

• Each thread has a method .spliterator().
• Each intermediate operation can change the characteristics of the separator.

My questions:

• Does each intermediate operation and change the characteristics in the same separator - "source-separator"?
• If we use the operation filter, some elements may be skipped. From which collection are these elements clouded exactly?

Answer 1

• - . Stream ( ).

• Collection ( , - sum, count ..), .