问题描述
在java中，外部类可以是public，final，default或abstract。
为什么不像
In java, An outer class may be public, final, default or abstract.Why not Static like
Static static class MyClass {}
推荐答案
外部类已经是隐式静态的。
An outer class is already implicitly static.
非静态嵌套类意味着内部类隐含地引用其父类。
Non-static nested class (= inner class) means thats the inner class implicitly has a reference to its parent class.
这就是为什么对于嵌套类，你可以区分静态和非静态。这对外部类没有意义。
That's why, for nested class, you can distinguish between static and non-static. This does not make sense for outer classes.
这里是一个例子来了解静态/非静态嵌套类之间的区别。你应该明白为什么在外部类中没有意义。
Here is an example to understand the difference between static/non-static nested class. You should understand why it does not make sense in an outer class.
public class MyClass {
private String anAttributeOfMyClass;
private /*static*/ class MyInnerClass {
public void foo() {
/*
* Here, I can access the attribute of the parent class
* because I implicitly have a reference to it.
* Try to make the nested class static an see the difference.
*/
anAttributeOfMyClass.trim();
}
}
}
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