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interface LogReaderStreamer extends LogReader, LogStreamer {
}

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interface LogReader {
    List<String> read();
}

interface LogStreamer {
    void stream(String message);
}

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echoConcat[Id]("Hello", "World!")

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echoConcat("Hello": Id[String], "World!": Id[String])

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trait Monad[F[_]] {
  def pure[A](value: A): F[A]
  def flatMap[A, B](value: F[A])(func: A => F[B]): F[B]
}

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type Id[A] = A

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def echoConcat[F[_]: Monad](s1: F[String], s2: F[String]): F[String] = for {
  x <- s1
  y <- s2
} yield s"echo $x $y"

echoConcat(Option("Hello"), Option("World!"))

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public synchronized void printText(String text) throws PrintingException {
    final PrintTask printTask = new PrintTask();

    PrintingListener printingListener = new PrintingListener() {
        @Override
        public void onSuccess(SuccessResult successResult) {
            printTask.setResult(PrintTask.RESULT_SUCCESS);
        }

        @Override

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public synchronized void printText(String text) throws PrintingException {
    final CompletableFuture<SuccessResult> result = new CompletableFuture();

    PrintingListener printingListener = new PrintingListener() {
        @Override
        public void onSuccess(SuccessResult successResult) {
            result.complete(successResult);
        }

        @Override

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public class PrintTask {

    public static final String RESULT_SUCCESS = "SUCCESS_PRINT";
    public static final String RESULT_FAILURE = "FAILURE_PRINT";
    public static final String RESULT_TIMEOUT = "TIMEOUT_PRINT";
    public static final String RESULT_NOTHING = "NOTHING_RESULT";

    private String result = RESULT_NOTHING;

    public void getResult() throws PrintingException {