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ToDoubleFunction Interface in Java with Examples

Last Updated : 11 Jul, 2025

The

is a part of the

package which has been introduced since Java 8, to implement

in Java. It represents a function which takes in an argument of type

and produces a double-valued result. This functional interface takes in only one generic, namely:-

• T: denotes the type of the input argument to the operation

The lambda expression assigned to an object of ToDoubleFunction type is used to define its

which eventually applies the given operation on its only argument. It is similar to using an object of type

<T, Double>. The ToDoubleFunction interface has only one function:

This method accepts an argument of type T and gives a double-valued result.

double applyAsDouble(T value)

This method takes in one parameter

which is an argument of type T.

This method returns a

result. Below is the code to illustrate applyAsDouble() method:

import java.util.function.ToDoubleFunction;

public class Main {
    public static void main(String args[])
    {
        ToDoubleFunction<Integer> ob = a -> a / 2;

        // using applyAsDouble()
        System.out.println(ob.applyAsDouble(3));
    }
}

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