In this implementation class, we use the CreditApplication input to create a simple CreditRating business object that we then return to the caller.

在这个实现类中，我们使用CreditApplication输入创建一个简单的CreditRating业务对象，然后我们将该业务对象返回到调用程序。

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CreditRating: Contains credit rating information such as credit score and credit limit. The credit rating business object (CreditRating) consists of three attributes.

CreditRating：包含信用等级信息，如信用分数和信用额度。

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