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If one took say 1000 lines of computer code and instead of the variables being declared independently, they were grouped together (obviously this does depend on the variable sizes being used) into classes and structs, would this directly increase the cache spacial locality (and therefore reduce the cache miss rate)?
I was under the impression by associating the variables within a class/struct they would be assigned continuous memory addresses?
If you are talking about method-local variables, they are already contiguous on the stack, or strictly speaking in activation records which are all but invariably on the stack. If you are talking about references to Java objects, or pointers to dynamically allocated C++ objects, putting them into containing classes won’t make any difference for another reason: the objects concerned will still be in arbitrary positions in the heap.