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Example shows Local variables support for Lambda Parameters in Java 11
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));
}
}
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