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给女朋友讲解什么是Optional【JDK 8特性】
source link: https://juejin.im/post/5bf2b1ece51d45353026a915
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前言 只有光头才能变强 前两天带女朋友去图书馆了，随手就给她来了一本《与孩子一起学编程》的书，于是今天就给女朋友讲解一下什么是Optional类。 至于她能不能看懂，那肯定是看不懂的。(学到变量/for循环的女人怎么能看懂呢) 不知道大家还记得上一篇《
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