类型继承后子类调用父类方法应该返回子类型吧?以后会修改吗? #2641
xiangnanscu
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如图:
![image](https://private-user-images.githubusercontent.com/8246344/326324284-ec9cae67-923d-46dd-93a9-7df88f2d6558.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.o4_Ipmnvyy4NmQrrg1RQZHlTnyMidbYvUEguSJKHSXo)
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