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Showing content from https://docs.oracle.com/javase/8/docs/api/java/util/function/Function.html below:

Function (Java Platform SE 8 )

• Type Parameters:

  T - the type of the input to the function

  R - the type of the result of the function

  All Known Subinterfaces:

  UnaryOperator<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 Function<T,R>

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

  Since:

  1.8

• • Method Detail
    • apply

      R apply(T t)

      Applies this function to the given argument.

      Parameters:

      t - the function argument

      Returns:

      the function result

    • compose

      default <V> Function<V,R> compose(Function<? super V,? extends T> before)

      Returns a composed function that first applies the before function to its input, and then applies this 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 input to the before function, and to the composed function

      Parameters:

      before - the function to apply before this function is applied

      Returns:

      a composed function that first applies the before function and then applies this function

      Throws:

      NullPointerException - if before is null

      See Also:

      andThen(Function)

    • andThen

      default <V> Function<T,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

      See Also:

      compose(Function)

    • identity

      static <T> Function<T,T> identity()

      Returns a function that always returns its input argument.

      Type Parameters:

      T - the type of the input and output objects to the function

      Returns:

      a function that always returns its input argument

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