一.静态内部类可以有静态成员，而非静态内部类则不能有静态成员。 二.静态内部类的非静态成员可以访问外部类的静态变量，而不可访问外部类的非静态变量；三.非静态内部类的非静态成员可以访问外部类的非静态变量。-A static inner class can have static members, rather than a static inner classes can not have static members.Two non-static inner classes static member can access the external static variable, and can not access the external non-static variable　non-static members of the non-static inner classes can access the external non-static variable.