Streams of Primitives

Java provides specialized Streams for three types of primitives IntStream (for ints), LongStream (for longs) and DoubleStream (for doubles). Besides being optimized implementations for their respective primitives, they also provide several specific terminal methods, typically for mathematical operations. E.g.:

IntStream is = IntStream.of(10, 20, 30);
double average = is.average().getAsDouble(); // average is 20.0