在Java中重新定义静态方法意味着什么？ [英] What does redefining static methods mean in Java?

问题描述

我一直在SCJP学习指南中阅读有关Statics的部分，它提到了以下内容：

I've been reading a section on Statics in the SCJP study guide, and it mentions the following :

静态方法可以'被覆盖，
但是可以重新定义

static methods can't be overridden, but they can be redefined

重新定义实际意味着什么？是否存在父和子都存在的静态方法，具有相同的签名，但是它们的类名分别引用它们？例如：

What does redefining actually mean? Is it a case of having a static method that exists in both parent and child, with the same signature, however they are referenced separately by their class names? Such as :

class Parent
{
   static void doSomething(String s){};
}

class Child extends Parent
{
   static void doSomething(String s){};
}

参考： Parent.doSomething（）; 和 Child.doSomething（）; ？

此外，这同样适用于静态变量，或只是静态方法？

Also, does the same apply for static variables, or just static methods?

推荐答案

它只是意味着这些函数不是虚拟的。例如，假设您有一个（运行时）类型的对象Child，它是从Parent类型的变量引用的。然后，如果您调用 doSomething ，则调用Parent的 doSomething 方法：

It simply means that the functions are not virtual. As an example, say that you have an object of (runtime) type Child which is referenced from a variable of type Parent. Then if you invoke doSomething, the doSomething method of the Parent is invoked:

Parent p = new Child();
p.doSomething(); //Invokes Parent.doSomething

如果方法是非静态的， doSomething of Child会覆盖Parent的， child.doSomething 会被调用。

If the methods were non-static, doSomething of Child would override that of Parent and child.doSomething would have been invoked.

静态字段也是如此。

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