9- Running Code on Completion

Jul 03, 2026 23:10 · 4:04 · English · Whisper Turbo · 2 Hökmdar

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Quite often we need to execute some code when an asynchronous operation completes.

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For example,

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we may want to display the result or store it in the database.

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Let me show you how to do that.

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First,

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let's create a completable future object.

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Here we call the supply async method and pass a

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lambda that returns one.

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Now this returns a completable future object.

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So let's store it over here.

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Now here we have a method called then run

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This is one of those methods that is provided by the completion stage interface.

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So if you type completion stage x and

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type x dot,

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here we can see all the methods declared in this completion stage interface.

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Earlier I told you that this interface represents a stage or a step

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in an asynchronous operation.

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So here we have a bunch of methods for modeling complex asynchronous

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operations.

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A lot of these methods start with then.

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That means when this task is finished,

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then do something else.

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So here we're going to call future dot then run.

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That means we're going to run some code once this task is finished.

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Now here we need to pass a runnable object.

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So we pass a lambda and print a

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message like done.

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Let's run our program.

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Here's our message.

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We also have then run async.

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This method is like the run async method that you saw earlier.

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It's basically saying run or execute this task in an asynchronous

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fashion.

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So the task that we pass here is runable object is going to be submitted

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to the underlying executor and execute it asynchronously.

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Let me show you.

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So I'm going to change this lambda.

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Let's add a code block.

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Here we print our done message.

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But before that,

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let's print the name of the current thread.

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So thread dot current thread dot get name.

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Now let's run our program.

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You can see that this task was executed on

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this thread fork join pool dot common pool worker three.

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In contrast,

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if we call then run,

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this task

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is executed on our main thread.

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So that is the difference between then run and then run

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async.

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Now we also have another pair of methods called then accept.

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This is useful if you want to get the result of this completable future.

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Let me show you.

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So delete.

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Look at the signature of this method.

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Here we should pass a consumer object.

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We talked about consumers earlier in the course.

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So this consumer interface has a single abstract method

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called accept.

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It takes an object and doesn't return a value.

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So here we can pass a lambda

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like this,

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result, and in the body of this lambda,

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we're going to print the current thread,

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so thread dot current thread dot get name,

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and then we're going to print the result.

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Let's see what happens.

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So,

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this task was executed on the main thread,

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and here's the result of this task.

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Now similarly we have then accept async,

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and this will submit this task to be executed asynchronously.

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Take a look.

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Now this task was executed on this thread,

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but we don't see the result.

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This happened because our main thread finished earlier than this other thread.

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So if we put a delay in our main thread,

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we can see the result.

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Let's put this in sleep for,

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let's say,

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two seconds and run the program

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again. There you go.

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So here's our thread and here's the result.

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So this is how we can execute some code

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upon completion of an asynchronous task.

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