public abstract method 只含有共有抽象方法 abstract method error 抽象方法错误 Overriding Non-Abstract Method with Abstract Method 将父类的非抽象方法覆写成抽象方法 ..
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说明抽象方法只可以定义在抽象类中。如果不是这样的话，就会收到编译错误。
Note abstract methods can only be defined in abstract classes. If you attempt to do otherwise, you will be issued a compiler error.
如果这种方法从不叫，你不会得到错误，这意味着它是不是真的“乐于助人”的宣言，以同样的方式，将一个抽象的。
And if that method is never called, you won't get the error, which to means it's not really "obliging" the declaration in the same way an abstract def would.
链接错误不能声明抽象方法的抽象基类？
Linker error from not declaring abstract method in abstract base class?
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