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为什么我强烈推荐你用枚举来实现单例模式
source link: https://juejin.im/post/5d08f67f51882565e833ff43
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单例模式简介 单例模式是 Java 中最简单，也是最基础，最常用的设计模式之一。在运行期间，保证某个类只创建一个实例，保证一个类仅有一个实例，并提供一个访问它的全局访问点。下面就来讲讲Java中的N种实现单例模式的写法。 饿汉式 public class Si
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