You can also save values of one type and then use them in the business objects of other types, which is useful when you have similar data in different business objects.
您还可以保存一种类型的值，然后在其他类型的业务对象中使用它们，当不同的业务对象中具有类似的数据时，这非常有用。
One benefit of working with objects is the guarantee of functionality that a type can give you.
使用对象的一个优点是类型可以为您提供功能的保证。
The JDBC API is designed in a hierarchical manner, where an object of one type contains objects of other types.
JDBC API 是按照层次结构方式设计的，其中一种类型的对象包含其他类型的对象。
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