可以使用局部最终变量数组。该变量必须是非基本类型，因此可以使用数组。你还需要同步两个线程，例如使用CountDownLatch：
public void test(){ final CountDownLatch latch = new CountDownLatch(1); final int[] value = new int[1]; Thread uiThread = new HandlerThread("UIHandler"){ @Override public void run(){ value[0] = 2; latch.countDown(); // Release await() in the test thread. } }; uiThread.start(); latch.await(); // Wait for countDown() in the UI thread. Or could uiThread.join(); // value[0] holds 2 at this point.}你也可以这样使用an Executor和a Callable：
public void test() throws InterruptedException, ExecutionException{ ExecutorService executor = Executors.newSingleThreadExecutor(); Callable<Integer> callable = new Callable<Integer>() { @Override public Integer call() { return 2; } }; Future<Integer> future = executor.submit(callable); // future.get() returns 2 or raises an exception if the thread dies, so safer executor.shutdown();}
