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? Singleton pattern is the most common and simplest design pattern in design pattern, which ensures that only one instance exists in the program and can be accessed globally. For example, account information object management used in actual APP development? Objects (SQLiteOpenHelper) and so on all use singleton mode. This model has several advantages:项声很是无奈，很快他发现了另外一个状况，对方对夜战很是熟悉，这正是自己一方的弱点。The humanoid monster in the former is relatively slow, But the ability to fight is very strong, Not sensitive to puncture attacks, Can resist medium caliber and medium power rifle bullets, In the face of fire, Only when they are completely smashed or their heads are cut off can they be killed. The latter, an unknown creature similar to a "dog", The target is small, Fast speed and evasive ability, After listening to Liu Guangyuan's description, After it can easily cross a large crater with a diameter of 5-6 meters, the impact speed is not weakened, so it can be seen that the unknown creature has extremely strong explosive force, rapid movement, and strong adaptability to complex terrain, but its defense force is poor, and it will die after being hit more times by weaker casualties (such as high-speed steel balls in anti-infantry mines)."Er... how do you say this, In terms of appearance, it should be regarded as common, but the physique is much larger than the common. The kind of rats that drill in the ground is a kind of big rats. They fly like big wasps in the sky. They are all in groups, and they are very fast and flexible. They are not easy to hit with guns. Once surrounded by them, they are basically finished. " Zhang Xiaobo said.韩信微微点头道：灌婴，交待给你的任务完成如何？元帅交待，三千轻骑兵抢占赵国营寨，遍地尽数插上我军赤色旗帜，末将照办无误，很是顺利。