CompletableFuture - Avoid transition task from one thread to another. It costs.

@Test
public void transitionTask(){
	CompletableFuture<Response> asycRequest = 
			CompletableFuture.supplyAsync(()->{
				return new Response();
			});
 
	Response reponse = asycRequest.join();
	System.out.println(reponse);
}

(本篇圖片都來自於link)

• Asynchronous API with CompletableFuture - Performance Tips and Tricks