@FunctionalInterface public static interface Remote.DoubleBinaryOperator extends DoubleBinaryOperator, Serializable
double-valued operands and
 producing a double-valued result.   This is the primitive type
 specialization of BinaryOperator for double.
 
This is a functional interface
 whose functional method is DoubleBinaryOperator.applyAsDouble(double, double).
BinaryOperator, 
Remote.DoubleUnaryOperatorapplyAsDouble