CompletableFuture demo

@Test
@SneakyThrows
public void a5() {
    List<Object> res = new ArrayList<>();
    CompletableFuture<?> completableFuture1 = CompletableFuture.runAsync(() -> {
        //主表 doSomething
        //res.add();
    });
    CompletableFuture<?> completableFuture2 = CompletableFuture.runAsync(() -> {
        //子表 doSomething
        //res.add();
    });
    CompletableFuture all = CompletableFuture.allOf(completableFuture1, completableFuture2);
    while (true) {
        if (all.isDone()) {
            //doSomething
            break;
        }
    }
    long b = System.currentTimeMillis();
    return String.valueOf(b - a);
}

@Test
@SneakyThrows
public void ah2() {
    List<CompletableFuture<Void>> list = new ArrayList<>();

    for (int i = 0; i < 5; i++) {
        list.add(CompletableFuture.runAsync(() -> {
            System.out.println(Thread.currentThread().getName());
        }));
    }
    CompletableFuture.allOf(list.toArray(new CompletableFuture[0])).join();// join 等待结果,不join 则不等待
    System.out.println("aaaaa");
    Thread.sleep(2000L);
}