用java模拟苍蝇的飞行轨迹,此算法还有入侵者,当入侵者少时苍蝇会攻击入侵者,而入侵者多少苍蝇会受到攻击.-With java analog flies flight path, the algorithm was an intruder when the intruder came from a fly will attack the intruder, while the number of flies will attack the intruder.