What is CompletableFuture and CompletionStage in Java?

Can you explain what CompletableFuture is in Java?

Sure! CompletableFuture is a class in Java that represents a future result of an asynchronous computation. It allows you to write non-blocking code.

How does it differ from Future?

Unlike Future, CompletableFuture can be manually completed and allows for chaining of multiple asynchronous tasks, making it more flexible.

What is CompletionStage and how is it related to CompletableFuture?

CompletionStage is an interface that represents a stage of a computation that can be completed. CompletableFuture implements this interface, providing additional methods for handling asynchronous tasks.

Can you give me an example of using CompletableFuture?

Certainly! You can use CompletableFuture to run a task asynchronously and then process the result when it's ready, like this: CompletableFuture.supplyAsync(() -> { return "Hello, World!"; }).thenAccept(System.out::println);.