java编写的坦克大战小游戏，功能简单，是一个学习java练习的小项目。功能：F2重新开始，敌人死光自动加入，简单的爆炸效果-Battle City game written in java, features simple, is a practice of small projects to learn java. Function: F2 to re-start, the enemy killed off automatically, a simple explosion effect