intermediateMultithreading & Concurrency243 of 436
Future vs CompletableFuture. Give a real-life example of where it is used.
Tests whether you know Future only supports blocking get() with no way to chain or compose callbacks, while CompletableFuture supports non-blocking composition (thenApply, thenCombine) -- e.g. fanning out calls to multiple downstream services and combining results without blocking a thread on each.
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