一个用java语言写的贪食蛇游戏的代码，与普通贪食蛇游戏的不同在于它的食物分为了几个等级，然后每个等级获得的奖励不一样，有穿墙和穿身两种奖励。-Written in a language with a Snake game java code, different from ordinary Snake game is that it is divided into several levels of food, then get the awards for each grade are di