Cjod-337-en-javhd-today-1027202202-19-15 Min «DIRECT · MANUAL»

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| ✅ | ❌ Don’t | |---|---| | Use IntStream , LongStream , DoubleStream for primitives. | Use Stream<T> for primitives – it forces boxing. | | Keep the pipeline stateless (no mutable shared state). | Mutate external collections inside map / filter . | | Prefer method references ( String::trim ) when they improve readability. | Write overly complex lambda bodies; split into helper methods. | | Leverage collect(Collectors.groupingBy(...)) for aggregations. | Write manual loops for grouping – it’s error‑prone. | | Test both sequential and parallel versions on realistic data sizes. | Assume parallel is always faster. | End with a question or a call to