ToDoubleBiFunction Interface in Java with Examples Last Updated : 08 Oct, 2018 Comments Improve Suggest changes Like Article Like Report The ToDoubleBiFunction Interface is a part of the java.util.function package which has been introduced since Java 8, to implement functional programming in Java. It represents a function which takes in two arguments of type T and U and produces a double-valued result. This functional interface takes in two generics, namely:- T: denotes the type of the first input argument to the operation U: denotes the type of the second input argument to the operation The lambda expression assigned to an object of ToDoubleBiFunction type is used to define its applyAsDouble() which eventually applies the given operation on its two arguments. It is similar to using an object of type BiFunction<T, U, Double>. The ToDoubleBiFunction interface has only one function: applyAsDouble() This method accepts two arguments of type T and U and produces a double-valued result. Syntax: double applyAsDouble(T t, U u) Parameters: This method takes in two parameters: t- the first input argument u- the second input argument Returns: This method returns a double-valued result. Below is the code to illustrate applyAsDouble() method: Program Java import java.util.function.ToDoubleBiFunction; public class Main { public static void main(String args[]) { ToDoubleBiFunction<Integer, String> ob = (a, b) -> a + Integer.parseInt(b) * 3.2; // Using applyAsDouble() System.out.println(ob.applyAsDouble(3, "10")); } } Output: 35.0 Comment More infoAdvertise with us Next Article ToDoubleBiFunction Interface in Java with Examples P psil123 Follow Improve Article Tags : Java Java - util package java-basics java-interfaces Java 8 +1 More Practice Tags : Java Similar Reads ToDoubleFunction Interface in Java with Examples The ToDoubleFunction Interface is a part of the java.util.function package which has been introduced since Java 8, to implement functional programming in Java. It represents a function which takes in an argument of type T and produces a double-valued result. This functional interface takes in only o 1 min read LongToDoubleFunction Interface in Java with Examples The LongToDoubleFunction Interface is a part of the java.util.function package which has been introduced since Java 8, to implement functional programming in Java. It represents a function which takes in a long-valued argument and gives a double-valued result. The lambda expression assigned to an ob 1 min read ToLongBiFunction Interface in Java with Examples The ToLongBiFunction Interface is a part of the java.util.function package which has been introduced since Java 8, to implement functional programming in Java. It represents a function which takes in two arguments of type T and U and produces an long-valued result. This functional interface takes in 2 min read ToIntBiFunction Interface in Java with Examples The ToIntBiFunction Interface is a part of the java.util.function package which has been introduced since Java 8, to implement functional programming in Java. It represents a function which takes in two arguments of type T and U and produces an int-valued result. This functional interface takes in t 2 min read ToIntFunction Interface in Java with Examples The ToIntFunction Interface is a part of the java.util.function package which has been introduced since Java 8, to implement functional programming in Java. It represents a function which takes in an argument of type T and produces an int-valued result. This functional interface takes in only one ge 1 min read Like