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. If you try to alter their values, another object gets created, whereas StringBuffer and StringBuilder are mutable, so they can change their values. Thread-Safety Difference: The difference between StringBuffer and StringBuilder is that StringBuffer is threadsafe. Mutable Strings: StringBuffer and StringBuilder classes, on the other hand, represent mutable strings. They allow you to modify the contents of the string without creating a new object every time.
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