final class collected in stack

It seems like you're asking about the concept of "final class" in the context of stack allocation. While the specific term "final class collected in stack" isn't directly addressed in the provided WWDC segments, I can provide some related information about memory management and performance in Swift, which might be relevant.

In Swift, memory management is a crucial aspect of performance optimization. The stack is used for memory that is scoped and has a clear point where it is no longer needed, making it very efficient. However, certain types of memory, like class instances, are typically allocated on the heap due to their dynamic nature and the need for flexible lifetime management.

For example, in the session Explore Swift performance, it is discussed how stack memory is cheap and efficient but requires a clear scope, whereas heap memory is more flexible but comes with a higher cost due to the need for allocation and deallocation.

If you have a specific question about how Swift handles memory for classes or other types, or if you're interested in how Swift manages memory in the context of interoperability with Java, feel free to ask!