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.

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A Java HashMap where the values are kept off the heap in a Memory Mapped File. I created this Map implementatio for caches where the Value objects a really BIG and just sit on your heap doing not much ...