public class AsyncMethodInvocation {
    /**
     * Async Method Invocation【異步方法調用】
     */
    @Test
    public void all() throws InterruptedException, ExecutionException {
        final String result = "async method invocation";
        // 1）可執行的異步任務呢
        final Callable<String> callable = ()->{
            // 2）異步任務的結果
            return result;
        };
        // 3）執行異步任務的線程池
        final ExecutorService executorService = Executors.newFixedThreadPool(1);
        final Future<String> future = executorService.submit(callable);
        // 4）可在將來讀取異步任務的計算結果
        assertEquals(result, future.get());
        executorService.awaitTermination(2, TimeUnit.SECONDS);
    }
}
 

異步方法調用【其他模式】