看看下面的两个类，哪个是建议的，它们又有什么不同？。

// Approach 1
public class Test extends Controller {
    private final DatabaseExecutionContext executionContext;

    @Inject
    public Test(DatabaseExecutionContext executionContext) {
        this.executionContext = executionContext;
    }

    public CompletableFuture<Result> get() throws ExecutionException,InterruptedException {

        return io().thenApply(Results::ok);
    }

    public CompletableFuture<String> io() throws ExecutionException,InterruptedException {
        return CompletableFuture.supplyAsync(() -> {
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            return "io";
        },executionContext);

    }
}

//Approach 2
public class Test extends Controller {
    private final DatabaseExecutionContext executionContext;

    @Inject
    public Test(DatabaseExecutionContext executionContext) {
        this.executionContext = executionContext;
    }

    public Result get() throws ExecutionException,InterruptedException {

        return Results.ok(io());
    }

    public String io() throws ExecutionException,executionContext).join();

    }
}

游戏对我来说是新手，我想了解如何正确处理阻塞的IO调用。 有人可以解释一下Play框架如何使用Completable Future，以我的观点，它仍然处于阻塞状态并且没有太大意义，并使我的代码处理的CompletableFuture本身就很可怕。