The list of directories ACTS like a stack — you push a directory onto the top of the stack, and pop a directory off the top again to get it back.
该目录列表的行为就像一个堆栈——您将一个目录压入堆栈顶部,并从顶部弹出一个目录以取回它。
2
When each of the other elements are parsed, you pop the Employee object off the stack, call the relevant set function, and push the object back on to the stack.