1.3.4 类的保护成员(protected) 定义：所谓多层继承指的是从一个类派生出另一个类，然后以派生类作为基类，派生出另一个类，直到最后生成的派生类满足需要为止（...
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具有受保护可视性的成员函数可以由与该成员函数在同一个类中定义或其任何子类中定义的其它任何成员函数调用。
A member function with protected visibility can be invoked by any member function in the class in which it is defined or any subclasses of that class.
将每个测试实例与它要测试的类放在同一个包内，以获得对包成员和保护成员的访问权。
Put each test case in the same package as the class it's testing to gain access to package and protected members.
这意味着类元素的所有的私有成员都将被首先转储，然后依次是被保护的成员和公共的成员。
This means that all the private members of the class element are dumped first, followed by protected and public, respectively.
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