2016年春夏学期面向对象程序设计的的3次作业，队列（Queue）是一种先进先出(FIFO)的线性表，允许在表尾插入元素，在表头删除元素。队列的主要操作包括入队(将一个元素添加至表尾)、出队(删除表头元素并返回该元素)、查询队列大小以及判断队列是否为空等-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