CompletableFuture
CompletableFuture is a class in Java's java.util.concurrent package that represents a future result of an asynchronous computation, providing a way to write non-blocking, asynchronous code. It allows developers to chain multiple asynchronous operations, handle exceptions, and combine results from multiple futures, making it a powerful tool for concurrent programming in Java.
Developers should learn CompletableFuture when building high-performance, scalable applications that require handling multiple asynchronous tasks efficiently, such as in microservices, web servers, 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.