Returning a value from a Thread?

Question

//... Some annoying getter 
ExecutorService es = Executors.newSingleThreadExecutor();
Future<Integer> result = es.submit(new Callable<Integer>() {
    public Integer call() throws Exception {
        //Get some value from the SQL database.
    }
});

return result;

Okay, I've looked all over. I need to know how I can make this wait until it finishes retrieving a value from a database to return this.

If you want to wait until the result is available, what's the point of executing that job in a separate thread, and not in the current thread? Or are you executing several of these jobs concurrently? — JB Nizet, Jan 23 '15 at 09:40

score 6 · Accepted Answer · answered Jan 23 '15 at 09:38

6

You use result.get() to wait for the task to finish and to retrieve the result.

The API documentation is your friend. Here's the page describing the API of Future.

answered Jan 23 '15 at 09:38

aioobe

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Returning a value from a Thread?

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