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常见Java面试题解析（基础篇，附答案）
source link: https://juejin.im/post/5e29c6035188254c3c275c2f
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前言 金三银四马上要来了，整理了Java一些经典面试题，也给出了答案，希望对大家有帮助，有哪里你觉得不正确的话，欢迎指出，非常感谢。 HashMap，HashTable，ConcurrentHash的共同点和区别 思路：可以从它们的底层结构、是否允许存储nul
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