@GwtCompatible public interface Function<F,T>
Functions class provides common functions and related utilites.
See the Guava User Guide article on the use of
input. This method is generally expected, but not absolutely required, to have the following properties:
(a, b)implies that
inputis null and this function does not accept null arguments
Most implementations will have no reason to override the behavior of
However, an implementation may also choose to return
object is a
Function that it considers interchangeable with this one. "Interchangeable"
typically means that
Objects.equal(this.apply(f), that.apply(f)) is true for all
f of type
F. Note that a
false result from this method does not imply
that the functions are known not to be interchangeable.
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