HashMap容量的初始化

https://mp.weixin.qq.com/s?__biz=MzI3NzE0NjcwMg==&mid=2650121359&idx=1&sn=c63d62be1a36db675c62e341044f10e0&chksm=f36bb9aec41c30b8b369428db1286d3de9bc04675057cde49632f3ba50db2d0a69451d6ec080&mpshare=1&scene=1&srcid=0529kU8fMyKTUrpKDwaLMJc6#rd