Callback (JavaFX 13)

Type Parameters:

P - The type of the argument provided to the call method.

R - The type of the return type of the call method.

All Known Implementing Classes:

MapValueFactory, PropertyValueFactory, TreeItemPropertyValueFactory

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 call method, with the second parameter specifying the return type of the method.

Since:

JavaFX 2.0

Method Summary

Modifier and Type	Method	Description
`R`	`call(P param)`	The `call` method is called when required, and is given a single argument of type P, with a requirement that an object of type R is returned.

- Method Detail
  - call
```
R call(P param)
```
    The call method is called when required, and is given a single argument of type P, with a requirement that an object of type R is returned.
    
    Parameters:
    
    param - The single argument upon which the returned value should be determined.
    
    Returns:
    
    An object of type R that may be determined based on the provided parameter value.