java.util.function Package : Functional interfaces provide target types for lambda expressions and method references.
Interfaces in java.util.function Package
S.No  Interface & Description 

1  BiConsumer<T,U>
Represents an operation that accepts two input arguments and returns no result.

2  BiFunction<T,U,R>
Represents a function that accepts two arguments and produces a result.

3  BinaryOperator<T>
Represents an operation upon two operands of the same type, producing a result of the same type as the operands.

4  BiPredicate<T,U> Represents a predicate (booleanvalued function) of two arguments.

5  BooleanSupplier
Represents a supplier of booleanvalued results.

6  Consumer<T>
Represents an operation that accepts a single input argument and returns no result.

7  DoubleBinaryOperator
Represents an operation upon two doublevalued operands and producing a doublevalued result.

8  DoubleConsumer
Represents an operation that accepts a single doublevalued argument and returns no result.

9  DoubleFunction<R>
Represents a function that accepts a doublevalued argument and produces a result.

10  DoublePredicate
Represents a predicate (booleanvalued function) of one doublevalued argument.

11  DoubleSupplier
Represents a supplier of doublevalued results.

12  DoubleToIntFunction
Represents a function that accepts a doublevalued argument and produces an intvalued result.

13  DoubleToLongFunction
Represents a function that accepts a doublevalued argument and produces a longvalued result.

14  DoubleUnaryOperator
Represents an operation on a single doublevalued operand that produces a doublevalued result.

15  Function<T,R>
Represents a function that accepts one argument and produces a result.

16  IntBinaryOperator
Represents an operation upon two intvalued operands and producing an intvalued result.

17  IntConsumer
Represents an operation that accepts a single intvalued argument and returns no result.

18  IntFunction<R>
Represents a function that accepts an intvalued argument and produces a result.

19  IntPredicate
Represents a predicate (booleanvalued function) of one intvalued argument.

20  IntSupplier
Represents a supplier of intvalued results.

21  IntToDoubleFunction
Represents a function that accepts an intvalued argument and produces a doublevalued result.

22  IntToLongFunction
Represents a function that accepts an intvalued argument and produces a longvalued result.

23  IntUnaryOperator
Represents an operation on a single intvalued operand that produces an intvalued result.

24  LongBinaryOperator
Represents an operation upon two longvalued operands and producing a longvalued result.

25  LongConsumer
Represents an operation that accepts a single longvalued argument and returns no result.

26  LongFunction<R>
Represents a function that accepts a longvalued argument and produces a result.

27  LongPredicate
Represents a predicate (booleanvalued function) of one longvalued argument.

28  LongSupplier
Represents a supplier of longvalued results.

29  LongToDoubleFunction
Represents a function that accepts a longvalued argument and produces a doublevalued result.

30  LongToIntFunction
Represents a function that accepts a longvalued argument and produces an intvalued result.

31  LongUnaryOperator
Represents an operation on a single longvalued operand that produces a longvalued result.

32  ObjDoubleConsumer<T>
Represents an operation that accepts an objectvalued and a doublevalued argument, and returns no result.

33  ObjIntConsumer<T>
Represents an operation that accepts an objectvalued and a intvalued argument, and returns no result.

34  ObjLongConsumer<T>
Represents an operation that accepts an objectvalued and a longvalued argument, and returns no result.

35  Predicate<T>
Represents a predicate (booleanvalued function) of one argument.

36  Supplier<T>
Represents a supplier of results.

37  ToDoubleBiFunction<T,U>
Represents a function that accepts two arguments and produces a doublevalued result.

38  ToDoubleFunction<T>
Represents a function that produces a doublevalued result.

39  ToIntBiFunction<T,U>
Represents a function that accepts two arguments and produces an intvalued result.

40  ToIntFunction<T>
Represents a function that produces an intvalued result.

41  ToLongBiFunction<T,U>
Represents a function that accepts two arguments and produces a longvalued result.

42  ToLongFunction<T>
Represents a function that produces a longvalued result.

43  UnaryOperator<T>
Represents an operation on a single operand that produces a result of the same type as its operand.

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 Java – LongSupplier Interface
 Java – BiPredicate Interface
 Java – DoubleFunction Interface
 Java – DoubleToIntFunction Interface
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 Java 8 Functional Interface
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 Java – LongToIntFunction Interface
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