CompletableFuture: Asynchronous Programming Tool in Java 8

In modern software development, asynchronous programming has become a key means to improve system performance, responsiveness, and scalability. Java 8 introduces the CompletableFutureclass, which brings powerful asynchronous programming capabilities to Java platforms.

This article will introduce you to this asynchronous programming tool: CompletableFuture.

What is CompletableFuture?

CompletableFutureis a class under the java.util.concurrentpackage introduced in Java 8. It represents the result of an asynchronous calculation, which can be completed, in progress, or not yet started. CompletableFutureprovides a flexible and type-safe way to express the lifecycle of asynchronous operations, including creating, composing, handling results, and handling exceptions. Its design inspiration comes from the Promises/Futures pattern in function-based programming, aiming to simplify the asynchronous programming model and improve code readability and maintainability.

Core features of CompletableFuture

1. Create CompletableFuture

a. completedFuture(T value)

completedFuture (T value)is a static factory method used to create a CompletableFuturethat is already in the finished state and contains the given result value. This applies to pre-computed results or constant values, allowing other components to…