KITFORMA · EDITORIAL ANSWER
How can I count and export the same Java stream without reusing a consumed pipeline?
KitForma editorial guide. A stream describes one traversal. Holding its reference does not preserve a reusable copy of the elements.
Step-by-step answer
A stream describes one traversal. Holding its reference does not preserve a reusable copy of the elements.
If the source is a small stable list, open a fresh stream for each independent traversal. If reading the source is expensive or destructive, collect the required intermediate data once or compute both results in one traversal. A Supplier must create a new stream;
() -> existingStream merely returns the same consumed object.
Test with a one-shot input as well as an in-memory collection. Check that a second traversal cannot see different records after source mutation. Materializing all elements trades repeatability for memory use, so impose a size limit rather than buffering an unbounded input.Sources and verification
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