| Return type | Name and parameters |
|---|---|
OptionalLong
|
filter(LongPredicate test)
If a value is present in the OptionalLong, tests the value using
the given predicate and returns the optional if the test returns true or
else empty.
|
long
|
get()
If a value is present in the OptionalLong, returns the value,
otherwise throws NoSuchElementException.
|
Optional
|
mapToObj(LongFunction mapper)
If a value is present in the OptionalLong, returns an Optional
consisting of the result of applying the given function to the value or else empty.
|
LongStream
|
stream()
If a value is present in the OptionalLong, returns a LongStream with the value as its source or else an empty stream. |
addShutdownHook, any, any, asBoolean, asType, average, collect, collect, collect, contains, count, dump, each, eachWithIndex, equals, every, every, find, find, findAll, findAll, findIndexOf, findIndexOf, findIndexValues, findIndexValues, findLastIndexOf, findLastIndexOf, findResult, findResult, flatten, getAt, getMetaClass, getMetaPropertyValues, getProperties, grep, grep, groupBy, groupBy, hasProperty, identity, inject, inject, inspect, invokeMethod, is, isCase, iterator, join, metaClass, print, print, printf, printf, println, println, println, putAt, respondsTo, respondsTo, setMetaClass, size, split, sprintf, sprintf, stream, sum, sum, tap, toArrayString, toSpreadMap, toString, use, use, use, with, with, withTraits
If a value is present in the OptionalLong, tests the value using
the given predicate and returns the optional if the test returns true or
else empty.
assert !OptionalLong.empty().filter(n -> true).isPresent() assert OptionalLong.of(123L).filter(n -> true).isPresent() assert !OptionalLong.of(123L).filter(n -> false).isPresent() assert OptionalLong.of(123L).filter(n -> true).getAsLong() == 123L
If a value is present in the OptionalLong, returns the value,
otherwise throws NoSuchElementException.
assert OptionalLong.of(1234L).get() == 1234L
If a value is present in the OptionalLong, returns an Optional
consisting of the result of applying the given function to the value or else empty.
assert !OptionalLong.empty().mapToObj(x -> new Object()).isPresent() assert OptionalLong.of(123L).mapToObj(x -> new Object()).isPresent() assert !OptionalLong.of(123L).mapToObj(x -> null).isPresent() assert OptionalLong.of(1234L).mapToObj(Long::toString).get() == '1234'
If a value is present in the OptionalLong, returns a LongStream with the value as its source or else an empty stream.