Web Reference: Mar 13, 2026 · StringBuffer is a mutable sequence of characters that is thread-safe. It is designed for multi-threaded environments where multiple threads may modify the same string object. Explanation: StringBuilder is a mutable sequence of characters similar to StringBuffer, but it is not thread-safe. The difference between StringBuffer and StringBuilder is that StringBuffer is threadsafe. So when the application needs to be run only in a single thread, then it is better to use StringBuilder. What is the difference between String, StringBuilder, and StringBuffer? At first glance, they all seem to just handle text. But under the hood, they behave very differently. And understanding those differences can help you write cleaner, faster, and more efficient code. Let’s break this down step-by-step. First, let’s start with immutability.
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