Project Summary
A Persistent Java Collections Library
PCollections serves as a persistent and immutable analogue of the Java Collections Framework. This includes efficient, thread-safe, generic, immutable, and persistent stacks, maps, vectors, sets, and bags, compatible with their Java Collections counterparts.
Persistent and immutable datatypes are increasingly appreciated as a simple, design-friendly, concurrency-friendly, and sometimes more time- and space-efficient alternative to mutable datatypes.
In a Nutshell, PCollections...
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has a well established, mature codebase
maintained by a small development team
with increasing Y-O-Y commits -
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took an estimated 2 years of effort (COCOMO model)
starting with its first commit in February, 2009
ending with its most recent commit 7 months ago
Quick Reference
MIT License
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Project Security
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30 Day SummaryJan 31 2026 — Mar 2 2026
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12 Month SummaryMar 2 2025 — Mar 2 2026
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