Here's a quick JDBC with HSQLDB tutorial to get you up and running with Java database connectivity and the popular HyperSQL database.

This tutorial explains how a Java HashMap works internally and explores the challenges of implementing it, including buckets, collisions and hash codes.

我们知道在Java中最常用的两种结构是数组和模拟指针 (引用)，几乎所有的数据结构都可以利用这两种来组合实现，HashMap也是如此。

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