Java FAQ: Top Questions

CompletableFuture , introduced in Java 8 in java.util.concurrent , is a powerful class for asynchronous programming, enabling non-blocking, composable operations with results or exceptions.

Key points:

• Asynchronous Execution: Runs tasks in separate threads, often via supplyAsync or runAsync .
• Chaining: Methods like thenApply , thenCombine , and handle allow functional composition.
• Exception Handling: Supports exceptionally or handle for errors.
• Completion: Can be completed manually with complete or completeExceptionally .
• Use Case: Asynchronous APIs, parallel processing, or reactive programming.