Explain the difference between thenApply() and thenCompose() in CompletableFuture.

Q: Explain the difference between thenApply() and thenCompose() in CompletableFuture.

thenApply(Function<T,R>) — Applies a synchronous transformation to the result. Returns CompletableFuture<R>. The function is NOT async — it runs in the same thread as the previous stage.

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Accepted Answer

thenApply(Function) — Applies a synchronous transformation to the result. Returns CompletableFuture. The function is NOT async — it runs in the same thread as the previous stage.