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

为什么非静态内部类不能有静态方法?

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

如果我将内部类设为静态，它就可以工作.为什么?

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

推荐答案

因为内部类的实例与其外部类的实例隐式关联，所以它本身不能定义任何静态方法.由于静态嵌套类不能直接引用其封闭类中定义的实例变量或方法，因此只能通过对象引用使用它们，因此在静态嵌套类中声明静态方法是安全的.

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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