Return type | Name and parameters |
---|---|
OptionalDouble
|
filter(DoublePredicate test)
If a value is present in the OptionalDouble , tests the value using
the given predicate and returns the optional if the test returns true or
empty otherwise.
|
double
|
get()
If a value is present in the OptionalDouble , returns the value,
otherwise throws NoSuchElementException .
|
Optional
|
mapToObj(DoubleFunction mapper)
If a value is present in the OptionalDouble , returns an Optional
consisting of the result of applying the given function to the value or else empty.
|
DoubleStream
|
stream()
If a value is present in the OptionalDouble, returns a DoubleStream with the value as its source or else an empty stream. |
addShutdownHook
, any
, any
, asBoolean
, asType
, collect
, collect
, collect
, dump
, each
, eachMatch
, eachMatch
, eachWithIndex
, every
, every
, find
, find
, findAll
, findAll
, findIndexOf
, findIndexOf
, findIndexValues
, findIndexValues
, findLastIndexOf
, findLastIndexOf
, findResult
, findResult
, findResult
, findResult
, getAt
, getMetaClass
, getMetaPropertyValues
, getProperties
, grep
, grep
, hasProperty
, identity
, inject
, inject
, inspect
, invokeMethod
, is
, isCase
, isNotCase
, iterator
, metaClass
, print
, print
, printf
, printf
, println
, println
, println
, putAt
, respondsTo
, respondsTo
, setMetaClass
, split
, sprintf
, sprintf
, stream
, tap
, toString
, use
, use
, use
, with
, with
, withCloseable
, withStream
, withTraits
If a value is present in the OptionalDouble
, tests the value using
the given predicate and returns the optional if the test returns true or
empty otherwise.
assert !OptionalDouble.empty().filter(n -> true).isPresent() assert OptionalDouble.of(Math.PI).filter(n -> true).isPresent() assert !OptionalDouble.of(Math.PI).filter(n -> false).isPresent() assert OptionalDouble.of(Math.PI).filter(n -> true).getAsDouble() == Math.PI
If a value is present in the OptionalDouble
, returns the value,
otherwise throws NoSuchElementException
.
assert OptionalDouble.of(Math.PI).get() == Math.PI
If a value is present in the OptionalDouble
, returns an Optional
consisting of the result of applying the given function to the value or else empty.
assert !OptionalDouble.empty().mapToObj(x -> new Object()).isPresent() assert OptionalDouble.of(Math.PI).mapToObj(x -> new Object()).isPresent() assert !OptionalDouble.of(Math.PI).mapToObj(x -> null).isPresent() assert OptionalDouble.of(Math.PI).mapToObj(Double::toString).get().startsWith('3.14')
If a value is present in the OptionalDouble, returns a DoubleStream with the value as its source or else an empty stream.