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Asked: 2026-06-08T15:29:40+00:00

Assuming I am using a single threaded application, can java.util.LinkedList have a loop? I

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Assuming I am using a single threaded application, can java.util.LinkedList have a loop? I see in the source code that Entry is a private inner class, so there is no way to tamper it. Just wondering, finding a loop in a linked is such a popular question for interviews. Nobody asks how to design a list to avoid having loops in the first place. Or am I misunderstanding something here?

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  1. Editorial Team

    You are right since j.u.LinkedList does not expose an api for creating lops it is not supported. Maybe with some reflection violence it might happen.

    I think the question comes from a generation of c programmers with a standard library with no linked list, who would often roll their own. Also since there is no private modifier in C it is always possible to create a loop in a C linked list if you wanted to.

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