Quick Answer
Future represents a pending async result. get() blocks until done (optionally with timeout). Limited: can't chain, no callbacks, no combining multiple futures. CompletableFuture (Java 8+) is much richer: thenApply() (transform result), thenCompose() (chain futures), thenCombine() (combine two futures), exceptionally() (handle errors), allOf() (wait for all), anyOf() (first to complete). Non-blocking with callbacks.
Answer
Future represents the result of an asynchronous computation. CompletableFuture extends Future with non-blocking, chainable, and combinational operations. Useful for reactive, asynchronous workflows.
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Verified Answer
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