Java tutorial
import java.util.function.DoubleUnaryOperator; public class Main { public static void main(String[] args) { DoubleUnaryOperator square = (x) -> { return x * x; }; DoubleUnaryOperator doubleValue = (x) -> { return 2 * x; }; System.out.println(doubleValue.compose(square).applyAsDouble(3.14)); } }