Introduction - If you have any usage issues, please Google them yourself
3rd Job 2016 spring and summer semesters of object-oriented programming, and queue (Queue) is a first in first out (FIFO) linear table, allowing the insertion of elements in the tail, removing elements in the header. The main operation queue, including the team (adds an element to the end of the table), the team (delete the header element and returns that element), the query queue sizes, and determines whether the queue is waited in vain