nested classes 分两类，static and non-static.后者又叫inner class. 前者叫static nested classes.
class OutClass{
static class StaticNestedClass{}
class InnerClass{}
}
nested classes可以声明private, protected, package private(default), public.但是一般的class确只能声明为public或者package private. 因为nested class是最为class member 看待的。An instance of an inner class can exist only within an instance of its enclosing class and has access to its enclosing class's members even if they are declared private.
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