在这种情况下最好是实施方法的抽象类而不是定义分别在你所有的具体类。
In this case it is better to implement the method in abstract class rather than defining it separately in all your concrete classes.
在这种情况下最好是实施方法的抽象类而不是定义分别在你所有的具体类。
In this case it is better to implement the method in abstract class rather than defining it separately in all your concrete classes.
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