Executor FixedThreadPool 执行后会发生什么，因为 executor 没有关闭方法？

Question

if I instantiate an Executor like so:

private final Executor executor = Executors.newFixedThreadPool(2);

And then execute some code as below:

executor.execute(() -> {
                    doSomeThingHere();
                });

What happens to the threadpool does it get destroyed after the code executes? Executor does not have any shutdown method? I am experiencing a build up of threads in my application every time I run through the process of the app. This may not be the cause but I want to understand this and rule it out. At the moment every time I want to run code on the background I instantiate a new executor in this way.

Answer 1

Use ExecutorService instead of Executor since newFixedThreadPool() returns an ExecutorService and that has a shutdown method.

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If the executor is created with a ThreadFactory that creates daemon threads (see setDaemon ), and there are no other non-daemon threads running, like the main thread or the EDT, the virtual machine will be terminated (stopping all threads)