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2572Increase the Maximum Half Connections曾鹏失笑道：你爹怕你们不会花银子？见他有嘲笑的意思，小娃儿不依了，把这花银子的窍门细细跟他掰扯了一遍，太浪费不成，太俭省也不成。这是高见翔警官生命中最艰难的一天：母亲去世，工作遇阻，还在奔丧时意外撞死了一个人。他本以为可以瞒天过海，没想到一个惊天阴谋在前方等待，令他身陷迷局......Is to create a factory class to create instances of some classes that implement the same interface. First, look at the following diagram:　　在骇人海兽肆虐的年代，凡是成功斩除怪物的猎人都会受到英雄般的对待。他们当中，最受人爱戴的就是伟大的雅各霍兰德。某天，年少的麦茜布兰伯偷偷溜上雅各传说中的船，意外成为他的得力助手。两人一起踏上精彩刺激的冒险，航向未知的水域，大笔写下历史。? 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: