为什么我们不能在（非静态）内部类中有静态方法？ [英] Why can't we have static method in a (non-static) inner class?

问题描述

为什么我们不能在非静态内部类中有静态方法？

Why can't we have static method in a non-static inner class ?

如果我让内部类静态它工作。为什么？

If I make the inner class static it works. Why ?

推荐答案

由于内部类的实例与其外部类的实例隐式关联，因此无法定义任何静态方法本身。由于静态嵌套类不能直接引用在其封闭类中定义的实例变量或方法，因此它只能通过对象引用来使用它们，所以可以安全地在静态嵌套类中声明静态方法。

Because an instance of an inner class is implicitly associated with an instance of its outer class, it cannot define any static methods itself. Since a static nested class cannot refer directly to instance variables or methods defined in its enclosing class, it can use them only through an object reference, it's safe to declare static methods in a static nested class.

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