一个地铁的收费系统，该系统是一个自动售票系统，有助于刚开始学习java的人-A subway toll system, which is an automatic ticketing system to help people just beginning to learn java

地铁自动售票仿真程序： 1、实现“选择目的车站”、“投币买票”、“找零”、“打印车票”等功能； 2、在操作的任何阶段都允许取消操作，钱款退回并恢复到初始状态； -Metro ticket vending simulation program: 1, and " the destination station" , " coin tickets" , " Keep the change," " print tickets&qu