# How to implement ToDoubleBiFunction<T, U> using lambda expression in Java?

Java 8Object Oriented ProgrammingProgramming

ToDoubleBiFunction<T, U> is a functional interface defined in java.util.function package. This functional interface accepts two parameters as input and produces a double-valued result. ToDoubleBiFunction<T, U> interface can be used as an assignment target for a lambda expression or method reference. This interface contains only one abstract method: applyAsDouble() and doesn't contain any default or static methods.

## Syntax

@FunctionalInterface
interface ToDoubleBiFunction<T, U> {
double applyAsDouble(T t, U u);
}

## Example

import java.util.function.ToDoubleBiFunction;

public class ToDoubleBiFunctionTest {
public static void main(String args[]) {
ToDoubleBiFunction<Integer, Integer> test = (t, u) -> t / u;   // lambda expression

System.out.println("The division of t and u is: " + test.applyAsDouble(50, 5));
System.out.println("The division of t and u is: " + test.applyAsDouble(100, 3));
}
}

## Output

The division of t and u is: 10.0
The division of t and u is: 33.0
Published on 23-Jan-2020 13:43:56