从线程返回值? [英] Returning a value from a Thread?

问题描述

//... 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;

好的，我都看过了.我需要知道如何让这个等待直到它完成从数据库中检索一个值来返回这个.

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.

推荐答案

您使用 result.get() 来等待任务完成并检索结果.

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

API 文档是您的朋友.这是描述 Future.

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

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