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public abstract class Response {
   private Response() {
   }

   // $FF: synthetic method
   public Response(DefaultConstructorMarker $constructor_marker) {
      this();
   }
}

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sealed class Response

data class Success(val body: String): Response()

data class Error(val code: Int, val message: String): Response()

object Timeout: Response()

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import com.jakewharton.retrofit2.adapter.rxjava2.RxJava2CallAdapterFactory
import io.reactivex.schedulers.Schedulers
import io.reactivex.subjects.ReplaySubject
import retrofit2.Retrofit
import retrofit2.converter.gson.GsonConverterFactory

val api: StackoverflowApi = Retrofit.Builder()
        .baseUrl("https://api.stackexchange.com/2.2/")
        .addConverterFactory(GsonConverterFactory.create())
        .addCallAdapterFactory(RxJava2CallAdapterFactory.create())

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import lombok.Data;
import lombok.experimental.ExtensionMethod;

@ExtensionMethod(Streams.class)
public class Foo {
    void foo(List<Person> persons) {
        persons.toStream()
               .filter(it -> it.getAge() >= 21)
               .filter(it -> it.getName().startsWith("P"))
               .map(Person::getName)

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dependencies {
    classpath 'me.tatarka:gradle-retrolambda:3.4.0'
}

apply plugin: 'me.tatarka.retrolambda'

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

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button.setOnClickListener(view -> System.out.println("Hello World!"));

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button.setOnClickListener { println("Hello World") }

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void foo(List<Person> persons) {
    persons.stream()
           .filter(it -> it.getAge() >= 21)
           .filter(it -> it.getName().startsWith("P"))
           .map(Person::getName)
           .sorted()
           .forEach(System.out::println);
}

class Person {

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import lombok.Data;
import com.annimon.stream.Stream;

void foo(List<Person> persons) {
    Stream.of(persons)
          .filter(it -> it.getAge() >= 21)
          .filter(it -> it.getName().startsWith("P"))
          .map(Person::getName)
          .sorted()
          .forEach(System.out::println);

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defaultConfig {
    jackOptions {
        enabled true
    }
}

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}