第一次接触java语言，按照老师要求以及教科书上的源码，编写好的贪吃蛇源码，希望对像我一样刚刚接触java的人有帮助！-First contact with the java language, in accordance with the requirements of teachers and textbooks on the source, write a good Snake source, just as I hope people have access to java help!