这是个用Java语言编写的游戏小程序。故事的起因是：冷战虽然结束了，但又出现了来自太空的新敌人UFO，它们可以干扰自动导航的导弹系统，所以你得亲自标准目标，射击。不能让它们登陆，否则你就输了！希望你从中可以学会如何用Java来编写此类游戏。-This the Java programming language of the game small programs. The causes of the story : Although the Cold War is over, but from a new enemy space UFO, they can interfere with the automatic navigation systems, so you have to personally standard target shooting. They can not allow the landing, otherwise you lose! I hope you can learn from how to use Java to prepare such games.