T- the type of the input to the function
R- the type of the result of the function
@FunctionalInterface public interface Function<T,R>
|Modifier and Type||Method and Description|
Returns a composed function that first applies this function to its input, and then applies the
Applies this function to the given argument.
Returns a composed function that first applies the
Returns a function that always returns its input argument.
t- the function argument
beforefunction 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.
V- the type of input to the
beforefunction, and to the composed function
before- the function to apply before this function is applied
beforefunction and then applies this function
NullPointerException- if before is null
afterfunction to the result. If evaluation of either function throws an exception, it is relayed to the caller of the composed function.
V- the type of output of the
afterfunction, and of the composed function
after- the function to apply after this function is applied
NullPointerException- if after is null
static <T> Function<T,T> identity()
T- the type of the input and output objects to the function
Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2018, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.