本代码模拟一个贪吃蛇的小游戏，对那些学习java图形编程的同学有一定帮助-This code simulates a small Snake game java graphics programming for those students learning some help. . .

贪吃蛇实训，一关，画布，各自，蛇头蛇尾，食物，具有贪吃蛇游戏一切功能(Snake training, off the canvas, each food has a snake, Snake game function)