问题描述
我用Google搜索了几次但仍无法理解超类型方法。任何人都可以解释这是什么？
I have googled couple of times but still can't understand the supertype method. Can anyone please explain what is this?
推荐答案
在OOPS中有一个超类型和子类型的概念，在java中这种关系通过继承实现，即使用 extends 关键字：
There is a notion of supertype and subtype in OOPS, In java this kind of relationship is implemented by inheritance i.e. using extends keyword:
class A {} // super class
class B extends A {} //sub class
任何成员（在超类中声明的字段，方法）将被称为超类型。
Any member (fields, methods) declared in super class is to be called supertype.
因此在上面的上下文中，如果类 A 具有方法如
Therefore in above context if class A has method like
class A {
void set()
}
Set是类 B的超类型方法。
但是，请注意，如果有另一个班级说 C ：
However, notice that if there is another class say C:
class C {
void set()
}
然后 set（）对于 C 类的方法不是超类型，因为没有关系类 A 和类 C 之间的ip（关系由 extends 关键字，用于继承）。
Then set() method is not supertype for C class because there is no relationship between class A and class C (relationship is created by extends keyword, for inheritance).
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