Building a High-Performance Orderbook in Java 24: The Data Structures That Actually Matter

madking.direct@gmail.com (Mad King) — Thu, 02 Apr 2026 00:00:00 +0000

I decided to build an orderbook from scratch.

Not as a homework exercise. Real market data. Real matching logic. The kind of thing that runs in production at exchanges and brokerages. And the most surprising thing wasn’t how hard it was — it was how much Java 24 simply got out of my way.

The orderbook is deceptively simple in concept: collect buy orders at various price levels, collect sell orders at various price levels, match them when they overlap. In practice, a naive implementation collapses under real-volume load. Here’s what changed when I leaned into the JVM properly.

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Building a High-Performance Orderbook in Java 24: The Data Structures That Actually Matter