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Asked: 2026-05-23T08:28:46+00:00

I’ve been wondering about the implementation of charAt function for String/StringBuilder/StringBuffer in java what

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I’ve been wondering about the implementation of charAt function for String/StringBuilder/StringBuffer in java
what is the complexity of that ?
also what about the deleteCharAt() in StringBuffer/StringBuilder ?

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  1. Editorial Team

    For String, StringBuffer, and StringBuilder, charAt() is a constant-time operation.

    For StringBuffer and StringBuilder, deleteCharAt() is a linear-time operation.

    StringBuffer and StringBuilder have very similar performance characteristics. The primary difference is that the former is synchronized (so is thread-safe) while the latter is not.

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