6- Completable Futures

Jul 03, 2026 23:03 · 1:38 · English · Whisper Turbo · 2 スピーカー

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講義索引

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S… Speaker 1 (6- Completable Futures)

Throughout the rest of this section,

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we're going to talk about a very important type called completable future.

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As you can see this class implements the future interface.

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So every completable future is a future object.

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Now the reason this is called completable future is that with this we can

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explicitly complete a future object.

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This is not something that we can do with the future interface.

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Now, this class also implements another interface called completion stage.

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If you look at the documentation,

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it says that this interface represents a stage of a

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possibly asynchronous operation.

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What does this mean?

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Well,

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in the real world,

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quite often an asynchronous operation involves many steps.

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For example,

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we may call a remote API to get some data.

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That is one step.

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Then perhaps we want to transform that data into a different structure.

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That's another step.

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And finally,

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we want to write that data into a database.

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That's another step.

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This interface represents a step or a stage of an asynchronous operation.

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And it gives us a bunch of methods for combining and composing

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these steps in a declarative way,

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kind of like how we use the streams API to build a complex query in

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a declarative way.

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Earlier,

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we use the map filter and reduce methods to build a complex query.

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Now we can do the same thing with this completion stage interface.

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I'm going to show you how to do that later in this section.

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So over the next few videos,

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we're going to talk about the completable feature class.

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I'm going to show you how to use this class to build complex asynchronous

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operations.

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But first,

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let me show you how to create a completable feature object.

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