The alternative would be something like "perform a transaction," where "transaction" was either a deposit or withdrawal operation.
替代方法可能是类似于“完成交易”的用例，其中“交易”是存款或取款操作。
2
The alternative mechanism to using Future objects is to register a callback to the asynchronous operation. The CompletionHandler interface has two methods.
使用Future对象的替代机制，是向异步操作注册一个callback。
3
At least for now, wrapped operation methods are the only way to use JAXB with Axis2 code generation (but see the JAX-WS discussion, shortly, for an alternative approach).