为什么我们无法创建抽象类和接口(interface)的实例？也就是说，抽象类和接口(interface)不能被实例化，只能由类来实现。
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An abstract class is a special kind of class that cannot be instantiated. So the question is why we need a class that cannot be instantiated? An abstract class is only to be sub-classed (inherited from). In other words, it only allows other classes to inherit from it but cannot be instantiated. The advantage is that it enforces certain hierarchies for all the subclasses. In simple words, it is a kind of contract that forces all the subclasses to carry on the same hierarchies or standards.
An interface is not a class. It is an entity that is defined by the word Interface. An interface has no implementation; it only has the signature or in other words, just the definition of the methods without the body. As one of the similarities to Abstract class, it is a contract that is used to define hierarchies for all subclasses or it defines specific set of methods and their arguments.
关于c# - 为什么抽象类和接口(interface)不能实例化？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20210583/