To be on the safe side, check the instance type of the returned object.

为了安全起见，检查返回的对象的实例类型。

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Additionally, Amazon tends to ask a lot of questions about object oriented design. Check out the object oriented design chapter for sample questions and Suggestions.

此外亚马逊还会问很多“面向对象设计”方面的问题，关于这一部分本书也有对应的例题。

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Step 2: Check constraints on object argument.

第2步：检查对象参数约束。

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