When a class implements an interface that has multiple base interfaces, objects created from that class can be upcast to any of the base interface types.
当一个类实现有多个基接口的接口时，从这个类生成的对象可以上溯到任何一个基接口。
When a class implements an interface that has multiple base interfaces, objects created from that class can be upcast to any of the base interface types.
当一个类实现有多个基接口的接口时，从这个类生成的对象可以上溯到任何一个基接口。
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