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Editorial Team
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Asked: 2026-06-09T05:10:03+00:00

As the title states, I am looking for a java collection keeping only the

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As the title states, I am looking for a java collection keeping only the N last objects inserted into the collection. This FIFO collection does not need to implement random access or support changing N.

All collections I can find are either blocking (LinkedBlockingQueue) or of unlimited size (ArrayDeque). I found org.eclipse.jetty.util.ArrayQueue but as you could guess this brings quite an unwanted dependency on my project and also is very complicated since it support changing N so its not what I need.

Do you know if there is a way to have that with a quite common java library or do I have to write it myself?

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  1. Editorial Team

    Check out Apache Commons CircularFifoBuffer

    CircularFifoBuffer is a first in first out buffer with a fixed size
    that replaces its oldest element if full.

    The removal order of a CircularFifoBuffer is based on the insertion
    order; elements are removed in the same order in which they were
    added. The iteration order is the same as the removal order.

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