Module java.base
Package java.util.function

# Interface BiFunction<T,U,R>

Type Parameters:
  `T` - the type of the first argument to the function
  `U` - the type of the second argument to the function
  `R` - the type of the result of the function

All Known Subinterfaces:
  `BinaryOperator<T>`

Functional Interface:
  This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface public interface BiFunction<T,U,R>
Represents a function that accepts two arguments and produces a result. This is the two-arity specialization of `Function`.

This is a functional interface whose functional method is `apply(Object, Object)`.

Since:
  1.8
See Also:
  - `Function`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `default <V> BiFunction<T,U,V>`
  `andThen(Function<? super R,? extends V> after)`
  Returns a composed function that first applies this function to its input, and then applies the `after` function to the result.
  `R`
  `apply(T t, U u)`
  Applies this function to the given arguments.

- ## Method Details

  - ### apply

    R apply(T t, U u)
    Applies this function to the given arguments.
    Parameters:
      `t` - the first function argument
      `u` - the second function argument
    Returns:
      the function result

  - ### andThen

    default <V> BiFunction<T,U,V> andThen(Function<? super R,? extends V> after)
    Returns a composed function that first applies this function to its input, and then applies the `after` function to the result. If evaluation of either function throws an exception, it is relayed to the caller of the composed function.
    Type Parameters:
      `V` - the type of output of the `after` function, and of the composed function
    Parameters:
      `after` - the function to apply after this function is applied
    Returns:
      a composed function that first applies this function and then applies the `after` function
    Throws:
      `NullPointerException` - if after is null