You can modify an existing class, pass it as a parameter, and take advantage of the API without requiring the base API to declare an abstract class or interface.

您可以修改已有类，将它作为参数传递，并利用API，而不需要基础 API声明一个抽象类或接口。

youdao

You can modify an existing class, pass it as a parameter, and take advantage of the API without requiring the base API to declare an abstract class or interface.

您可以修改已有类，将它作为参数传递，并利用API，而不需要基础 API声明一个抽象类或接口。

youdao