public default <V> BiFunction<T, U, 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.

Parameters:
<V>    the type of output of the after function, and of the composed function
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

Exceptions:
NullPointerException    if after is null