Uses of Class
java.util.Optional

Packages that use Optional

Package	Description
java.util
java.util.stream

Uses of Optional in java.util

Methods in java.util that return Optional

Modifier and Type	Method and Description
static <T> Optional<T>	Optional.empty()
Optional<T>	Optional.filter(Predicate<? super T> predicate)
<U> Optional<U>	Optional.flatMap(Function<? super T,Optional<U>> mapper)
<U> Optional<U>	Optional.map(Function<? super T,? extends U> mapper)
static <T> Optional<T>	Optional.of(T value)
static <T> Optional<T>	Optional.ofNullable(T value)

Method parameters in java.util with type arguments of type Optional

Modifier and Type	Method and Description
<U> Optional<U>	Optional.flatMap(Function<? super T,Optional<U>> mapper)

Uses of Optional in java.util.stream

Methods in java.util.stream that return Optional

Modifier and Type	Method and Description
Optional<T>	Stream.findAny()
Optional<T>	Stream.findFirst()
Optional<T>	Stream.max(Comparator<? super T> comparator)
Optional<T>	Stream.min(Comparator<? super T> comparator)
Optional<T>	Stream.reduce(BinaryOperator<T> accumulator)

Methods in java.util.stream that return types with arguments of type Optional

Modifier and Type	Method and Description
static <T> Collector<T,?,Optional<T>>	Collectors.maxBy(Comparator<? super T> comparator)
static <T> Collector<T,?,Optional<T>>	Collectors.minBy(Comparator<? super T> comparator)
static <T> Collector<T,?,Optional<T>>	Collectors.reducing(BinaryOperator<T> op)