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单例模式(Singleton)介绍所谓类的单例设计模式，就是采取一定的方法，保证在整个的软件系统中，对某个类只能存在一个对象实例，并且该类只提供一个取得其对象实例的方法（静态方法）。比如Hibernate的SessionFactory，它充当数据存储源的代理，并负责创建Session对...

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设计模式 -- 单例模式(Java&&PHP)

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