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面试中单例模式有几种写法？
source link: https://juejin.im/post/5a162f6d5188253edc7f9457
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“你知道茴香豆的‘茴’字有几种写法吗？” 纠结单例模式有几种写法有用吗？有点用，面试中经常选择其中一种或几种写法作为话头，考查设计模式和coding style的同时，还很容易扩展到其他问题。这里讲解几种猴哥常用的写法，但切忌生搬硬套，去记“茴香豆的写法”。
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