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A list of all the functional interfaces in java

Andreas Lundblad

Here is a complete list of all the functional interfaces available in the standard Java API.

Interface Type
Runnable
BiConsumer(T, U) T, U →
BiFunction(T, U, R) T, U → R
BinaryOperator T, T → R
BiPredicate<T, U> T, U → boolean
BooleanSupplier → boolean
Consumer T →
DoubleBinaryOperator double, double → double
DoubleConsumer double →
DoubleFunction double → R
DoublePredicate double → boolean
DoubleSupplier boolean →
DoubleToIntFunction double → int
DoubleToLongFunction double → long
DoubleUnaryOperator double → double
Function<T, R> T → R
IntBinaryOperator int → int
IntConsumer int →
IntFunction int → R
IntPredicate int → boolean
IntSupplier → int
IntToDoubleFunction int → double
IntToLongFunction int → long
IntUnaryOperator int → int
LongBinaryOperator long, long → long
LongConsumer long →
LongFunction long → R
LongPredicate long → boolean
LongSupplier → long
LongToDoubleFunction long → double
LongToIntFunction long → int
LongUnaryOperator long → long
ObjDoubleConsumer T, double →
ObjIntConsumer T, int →
ObjLongConsumer T, long →
Predicate T → boolean
Supplier → T
ToDoubleBiFunction<T, U> T, U → double
ToDoubleFunction T → double
ToIntBiFunction<T, U> T, U → int
ToIntFunction T → int
ToLongBiFunction<T, U> T, U → long
ToLongFunction T → long
UnaryOperator T → T

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