这个程序是实现人工智能中的A*算法，照着书上的算法做的。Queue类是自己写的一个队列类，用来实现open表和closed表。原来用Vector做的，但后来发现Vector中保存的只是引用，生成子状态后表中的状态也跟着变了，只好自己实现一个队列类。-This process is the realization of artificial intelligence in the A* algorithm, the algorithm follow the book to do. Queue is a queue to write their own category, used for open forms and closed forms. Vector to do with the original, but later found saved Vector only used to generate sub-state status after the table has also changed, had their own type of the realization of a queue.