Why CompletableFuture.runAsync is not executed?

Question

I consider that main thread must end after sub thread.But below code shows the process finished before print the \"async end\".What is the reason?Can anybody explain?Thx.

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Answer 1

It is executed, you just aren't waiting for the result.

The Javadoc of CompleteableFuture.runAsync() says:

Returns a new CompletableFuture that is asynchronously completed by a task running in the ForkJoinPool.commonPool() after it runs the given action.

The Javadoc of ForkJoinPool.commonPool() says:

Any program that relies on asynchronous task processing to complete before program termination should invoke commonPool().awaitQuiescence(), before exit.

So, invoke that.