问题4：我们只能采用数组来组织和管理动态 集合吗？ Out Roughly,a stack is a set of objects which arrive at different points in time and are added to the set.When elements are deleted from the set, the object which was inserted last is removed first. A stack can be visualised as a pile of objects where objects can be added to or removed from the pile only from the top (see figure 2.3). Figure 2.3 Pictorial model of a stack.问题4：我们只能采用数组来组织和管理动态 集合吗？