java-如何实现多个(不确定的)异步回调。有没有设计模式之类的？

public interface Callback {
    void onComplete(Object result);
    void onError(Exception e);
}

public class CallbackHandler implements Callback {
    @Override
    public void onComplete(Object result) {
        // 处理成功回调
    }

    @Override
    public void onError(Exception e) {
        // 处理错误回调
    }
}

public class AsyncOperation {
    private List<Callback> callbacks = new ArrayList<>();

    public void addCallback(Callback callback) {
        callbacks.add(callback);
    }

    public void removeCallback(Callback callback) {
        callbacks.remove(callback);
    }

    public void doAsyncOperation() {
        // 执行异步操作
        // 异步操作完成后，调用观察者的回调方法
        for (Callback callback : callbacks) {
            callback.onComplete(result);
        }
    }
}

AsyncOperation asyncOperation = new AsyncOperation();
Callback callback1 = new CallbackHandler();
Callback callback2 = new CallbackHandler();
asyncOperation.addCallback(callback1);
asyncOperation.addCallback(callback2);
asyncOperation.doAsyncOperation();