14- Waiting for Many Tasks to Complete

Jul 04, 2026 01:18 · 2:48 · English · Whisper Turbo · 2 Redner

Diese Abschrift läuft heute aus. Upgrade für die permanente Lagerung →

Literaturverzeichnis

0:03

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

Sometimes we need to wait for the completion of many tasks before doing something else.

0:07

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

Let me show you how to do this.

0:09

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

So I'm going to create three completable features to represent three

0:13

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

asynchronous tasks.

0:14

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

Here's the first one.

0:16

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

We set this to completable future that supply sync

0:20

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

and here we return one.

0:22

S… Speaker 1 (14- Waiting for Many Tasks to Complete)

Here's our second task.

0:24

S… Speaker 1 (14- Waiting for Many Tasks to Complete)

We return two and here's the third task.

0:30

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

Now, we want to wait for all these tasks to complete before doing something else.

0:34

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

To do that we call completable future dot all

0:39

S… Speaker 1 (14- Waiting for Many Tasks to Complete)

of.

0:39

S… Speaker 1 (14- Waiting for Many Tasks to Complete)

Now look at the signature of this method.

0:41

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

Here we have completable future dot dot dot.

0:44

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

This is called var args which means a variable number of arguments.

0:49

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

We can pass zero or more arguments.

0:50

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

So I'm going to pass first,

0:52

S… Speaker 1 (14- Waiting for Many Tasks to Complete)

second,

0:53

S… Speaker 1 (14- Waiting for Many Tasks to Complete)

and third.

0:55

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

Now this will return a new completable future that will complete when

0:59

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

all of these completable futures complete.

1:01

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

So let's store the result over here.

1:04

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

Look at the type of this variable that is a completable future

1:09

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

of void.

1:10

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

Why is it void?

1:11

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

Because each completable future may return a different data type,

1:14

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

one might return a string,

1:16

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

another completable future might return an integer.

1:19

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

So there is no way for us to know what is the final result.

1:22

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

That is why this is a completable future of void.

1:25

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

It's like a task that will complete when many other tasks complete.

1:29

S… Speaker 1 (14- Waiting for Many Tasks to Complete)

Okay?

1:30

S… Speaker 1 (14- Waiting for Many Tasks to Complete)

So,

1:31

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

here we can write all dot then run,

1:35

S… Speaker 1 (14- Waiting for Many Tasks to Complete)

here we pass a runnable object,

1:38

S… Speaker 1 (14- Waiting for Many Tasks to Complete)

and then print

1:42

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

all tasks completed successfully.

1:45

S… Speaker 1 (14- Waiting for Many Tasks to Complete)

Let's run our program.

1:48

S… Speaker 1 (14- Waiting for Many Tasks to Complete)

So here's the message.

1:52

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

But what if you want to get the result of each of these completable future

1:56

S… Speaker 1 (14- Waiting for Many Tasks to Complete)

objects?

1:56

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

Well, that is very easy.

1:59

S… Speaker 1 (14- Waiting for Many Tasks to Complete)

We can call first that get this will return the

2:03

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

result of the first completable future.

2:05

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

But in this case,

2:06

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

this method is not going to block the current thread because this code

2:11

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

this task is going to get executed asynchronously when

2:16

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

all these tasks are complete.

2:17

S… Speaker 1 (14- Waiting for Many Tasks to Complete)

So at this point,

2:19

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

when we call the get method on any of these completable features,

2:22

S… Speaker 2 (14- Waiting for Many Tasks to Complete)

we get the result immediately because the result is ready.

2:26

S… Speaker 1 (14- Waiting for Many Tasks to Complete)

So we get the result of the first task and store

2:30

S… Speaker 1 (14- Waiting for Many Tasks to Complete)

it here.

2:31

S… Speaker 1 (14- Waiting for Many Tasks to Complete)

First result.

2:33

S… Speaker 1 (14- Waiting for Many Tasks to Complete)

Now we should wrap this inside a try catch block.

2:36

S… Speaker 1 (14- Waiting for Many Tasks to Complete)

So we get the first result and then print it.

2:43

S… Speaker 1 (14- Waiting for Many Tasks to Complete)

So here's the first result and our final message.

Dieses Transkript wurde durch AI (automatische Spracherkennung) erzeugt. Kann Fehler enthalten — überprüfen Sie gegen das Original-Audio für kritische Verwendung. KI-Politik

❤️ Liebst du STT.ai? Erzähl es deinen Freunden!

Zusammenfassung

Klicken Sie auf Zusammenfassung, um eine KI-Zusammenfassung dieses Transkripts zu generieren.

Fragen Sie AI über diesen Text

Fragen Sie etwas über dieses Transkript – die KI wird relevante Abschnitte und Antworten finden.

Einen anderen Transcribe