CompletableFuture
CompletableFuture is a class in Java's java.util.concurrent package that represents a future result of an asynchronous computation. It provides a flexible API for composing, combining, and handling asynchronous operations, allowing developers to write non-blocking, reactive-style code. It supports chaining multiple asynchronous tasks, handling exceptions, and combining results from multiple futures.
Developers should learn CompletableFuture when building high-performance, scalable applications in Java that require asynchronous processing, such as web servers, microservices, or data processing pipelines. It is particularly useful for avoiding thread blocking, improving resource utilization, and simplifying complex asynchronous workflows compared to traditional Future or callback-based approaches.