java.util.stream · java.base · since Java 1.8

IntStream

declaration

public interface IntStream extends BaseStream<Integer, IntStream>

Primitive int pipeline: no boxing, plus numeric terminals (sum, average, summaryStatistics) and range() as the modern indexed loop.

Key methods

`static IntStream range(int start, int end)`	Half-open [start, end) — the for-loop replacement.
`static IntStream rangeClosed(int start, int end)`	Inclusive end.
`int sum() / OptionalDouble average() / OptionalInt max()`	Built-in numeric terminals.
`IntSummaryStatistics summaryStatistics()`	Count/sum/min/max/avg in one pass.
`Stream<Integer> boxed()`	Bridge to the object stream (allocates!).
`IntStream mapToInt … / mapToObj(IntFunction<R>)`	Bridges in and out.