问题
I have a class (let's call it A) that is extended by several children class (B, C, D, etc.).
In each child class, there are specific methods that I'd like to be accessible from an instantiation of the parent class A.
I tried to declare A as an abstract class, and to declare each child class methods inside as abstract. Then I implemented these methods in their own class but it seems that each child class must implement every method of the parent class. However, I can't do this.
Would you have an idea for this issue?
回答1:
In each children class, there are specific methods that I'd like to be accessible from an instantiation of the parent class A.
That's not the point of inheritance. Even if you could do this, it shows that your design is broken.
来源：https://stackoverflow.com/questions/4394129/implementing-parent-class-methods-with-several-children-class-in-java