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《23种设计模式（Java版）》| 单例模式（内附源码案例）。

一、概述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）。二、单例模式八种方式饿汉式（静态常量）//饿汉式（静态变量） class Singleton{ //1.构造器私有化 ...

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