学习堆对象的分配与释放、静态数据成员和静态成员函数的使用、链表类的定义与使用 模拟栈操作：设计一个整数链表类，满足栈操作。即，总在链表首插入结点，总在链表首取出（删除）结点。-Learning object heap allocation and release, static data members and static member functions use the definition of category list with the use of simulated st