Although there has been a lot of AVL tree libraries available now, nearly all of them are meant to work in the random access memory(RAM). Some of them do provide some mechanism for dumping the whole tree into a file and loading it back to the memory

独立于AVL库的存储媒体 虽现在有不少可用的AVL树库，但几乎都是工作在RAM中，当数据量小的时候，这种方式可行，但当树结构变大时时，读取和存储的时间就会大大变长，任务效率大大降低。能不能直接用磁盘进行树的操作呢？若可以，就不必进行频繁的磁盘内存交换了，本程序就实现了这个功能。实际上，这个程序无论是磁盘还是内存，都很好用。-independent of the AVL storage media is now available in a number of the AVL tree, Bu