Example shows Local variables support for Lambda Parameters in Java 11

RideProviderTest.java

import org.jetbrains.annotations.NotNull;

import java.util.Comparator;
import java.util.function.ToLongFunction;
import java.util.stream.Stream;

public class RideProviderTest {

    @FunctionalInterface
    private interface RideProvider {
        long getFareEstimate(String type);
    }

    public static void main(String[] args) {

        // implicitly typed lambda expression
        ToLongFunction<RideProvider> lyftProvider = (@NotNull var provider) -> provider.getFareEstimate("Lyft");

        var lyft = new RideProvider() {
            @Override
            public long getFareEstimate(String type) {
                var estimated_cost_cents_max = 0;
                switch (type) {
                    case "Line":
                        estimated_cost_cents_max = 3307;
                        break;

                    case "Lyft":
                        estimated_cost_cents_max = 7306;
                        break;

                    case "Plus":
                        estimated_cost_cents_max = 12451;
                        break;

                    case "Premier":
                        estimated_cost_cents_max = 17562;
                        break;

                    case "Lux":
                        estimated_cost_cents_max = 23624;
                        break;

                    case "Lux SUV":
                        estimated_cost_cents_max = 25879;
                        break;

                }

                return estimated_cost_cents_max;
            }
        };

        long lyftFare = lyftProvider.applyAsLong(lyft);

        // implicitly typed lambda expression
        ToLongFunction<RideProvider> uberProvider = (@NotNull var provider) -> provider.getFareEstimate("uberX");

        var uber = new RideProvider() {
            @Override
            public long getFareEstimate(String type) {
                var estimated_cost_cents_max = 0;
                switch (type) {
                    case "POOL":
                        estimated_cost_cents_max = 7000;
                        break;

                    case "EXPRESS POOL":
                        estimated_cost_cents_max = 7000;
                        break;

                    case "uberX":
                        estimated_cost_cents_max = 9200;
                        break;

                    case "WAV":
                        estimated_cost_cents_max = 9200;
                        break;

                    case "ASSIST":
                        estimated_cost_cents_max = 9200;
                        break;

                    case "uberXL":
                        estimated_cost_cents_max = 14800;
                        break;

                    case "SELECT":
                        estimated_cost_cents_max = 20900;
                        break;

                    case "SUV":
                        estimated_cost_cents_max = 30600;
                        break;
                }

                return estimated_cost_cents_max;
            }
        };

        long uberFare = uberProvider.applyAsLong(uber);

        // compare the futures for best fare estimate
        Stream.of(lyftFare, uberFare)
                .
                        min(Comparator.comparing(i -> i))
                .
                        ifPresent(estimated_cost_cents_max -> System.out.println("$" + estimated_cost_cents_max / 100));
    }
}