- Type Parameters:
P- The type of the argument provided to the
R- The type of the return type of the
- 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 Callback<P,R>The Callback interface is designed to allow for a common, reusable interface to exist for defining APIs that requires a call back in certain situations.
Callback is defined with two generic parameters: the first parameter specifies the type of the object passed in to the
callmethod, with the second parameter specifying the return type of the method.
- JavaFX 2.0
callmethod is called when required, and is given a single argument of type P, with a requirement that an object of type R is returned.
param- The single argument upon which the returned value should be determined.
- An object of type R that may be determined based on the provided parameter value.