Working with streams - Java 8 in Action: Lambdas, Streams, and Functional-Style Programming - page 129

You've now seen a lot of stream operations that you can use to express sophisticated data
processing queries! Table 5.1 summarizes the operations seen so far. You get to practice them in
the next section through an exercise.

Table 5.1. Intermediate and terminal operations

Operation Type Return

type

Type/functional
interface used

Function
descriptor

filter Intermediate Stream<T> Predicate<T> T -> boolean

distinct Intermediate Stream<T>

(stateful-unbounded)

skip Intermediate Stream<T> long

(stateful-bounded)

limit Intermediate Stream<T> long

(stateful-bounded)

map Intermediate Stream<R> Function<T, R> T -> R

flatMap Intermediate Stream<R> Function<T, Stream<R>> T -> Stream<R>

sorted Intermediate Stream<T> Comparator<T> (T, T) -> int

(stateful-unbounded)

anyMatch Terminal boolean Predicate<T> T -> boolean

noneMatch Terminal boolean Predicate<T> T -> boolean

allMatch Terminal boolean Predicate<T> T -> boolean

findAny Terminal Optional<T>

findFirst Terminal Optional<T>