如果不使用ExecutorService,我如何获得未来的<MyObject>?

试试未来任务。它对Executor框架没有任何明确的依赖关系,可以按原样实例化,也可以扩展它来定制它。

public static Future<T> createFuture(Callable<T> callable)
{
    ExecutorService service = Executors.newSingleThreadExecutor();
    Future<T> ret = service.submit(callable);
    // Let the thread die when the callable has finished
    service.shutdown();
    return ret;
}

编辑:展开 alphazero's answer ,你会用 FutureTask 这样地:

FutureTask<MyObject> future = new FutureTask<MyObject>(myCallable);
new Thread(future).start(); // FutureTask implements Runnable
// Now use the future however you want

是的,我会说这比我的第一个答案要好:)

class X extends Thread {
   MyObject result;

   public void run() {
      // .. do the operation here. Set result
   }

   public MyObject getResult() {
      // This will block until the thread is complete
      join();
      return result;
   }
}

要运行此呼叫,请执行以下操作:

X x = new X();
x.start();

x.getResult();