Block return until async call is finished Java?

Question

public void method(){
   runAsyncFunction();
   return;
}

I am wondering how it would be possible to block and NOT return this function (method) until the runAsyncFunction() is complete. Is this possible in Java 8? I have read about Futures, but I am not too sure how they work yet.

What does `runAsyncFunction()` return? How does it let you know that it's completed its task? — ernest_k, Feb 08 '19 at 17:59
Why do you call an asynchronous function, if you do not want to have it asynchronously? — Seelenvirtuose, Feb 08 '19 at 18:03
I suggest you read this [awesome answer](https://stackoverflow.com/a/748189/8075923) that explains what asynchronous/synchronous method really means. — Soutzikevich, Feb 08 '19 at 18:47

score 0 · Answer 1 · answered Feb 08 '19 at 18:17

Why do you call an asynchronous function, if you do not want to have it asynchronously? For example Future only

See JavaDoc Future

public void method(){
   FutureTask<String> future=
   new FutureTask<String>(new Callable<String>() {
     public String call() {
       return searcher.search(target);
   }});
   executor.execute(future);
   while(!future.isDone()){
       Thread.sleep(100);
   }
   return;
}

Block return until async call is finished Java?

1 Answers1