具有非抽象方法的抽象类，如果一个新的抽象类的对象不能被创建的点是什么？

What is the point of having non abstract methods in the abstract class if a new object of the abstract class can't be created?

youdao

在查看更多的类型，是来自一个抽象表现的最好方法是什么？

What is the best way to display in a view more types that are derived from an abstract base?

youdao

在查看更多的类型，是来自一个抽象表现的最好方法是什么？

What is the best way to display in a view more types that are derived from an abstract base?

youdao