BankSystem:由于约会多线程环境：开始的业务层单例是一个以时间换取空间的策略。先在业务多个用户登录，业务层处理存在排队现象现在业务层取消单例，让每个用户拥有独有的业务服务问题：1.一个账号多人请求登录，出现多个账号在线。 --dao层注册于登录前需要先判断user_pool while（uers.get（username）！= null）2.多个账号同时给一个账号转账时，会出现getMoney（），setMoney（）的线程安全问题。-给改变ProperFiePo对象的钱值的都加同步锁，防止多线程

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