此程序是基于JFrame，结合JPanel和Component的监听器来实现的贪吃蛇小游戏。主要实现功能如下：

1)利用方向键来改变蛇的运行方向。

2)在随机的地方产生食物，吃到食物就变成新的蛇体，碰到壁或自身则游戏结束，否则正常运行。

3)空格键暂停或继续游戏。

通过菜单选项可选择三种刷新速度。-

This program is based on the JFrame, JPanel and Component combines the listener to achieve the Snake game. The main achievement of the following functions:

1) Use the arrow keys to change the direction of the snake.

2) generates random local food, eat food becomes the new snake body, hit the wall or the end of the game itself, otherwise normal operation.

3) the spacebar to pause or resume the game.

By choice of three menu options refresh rate.