Web Reference: Oct 11, 2025 · In Java, strings are widely used to store and manipulate text. However, Java provides three different classes for handling string-related operations, String, StringBuilder, and StringBuffer. 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. StringBuilder is usually the fastest in single-threaded programs because it's lightweight and avoids unnecessary object creation. StringBuffer is just a little slower than StringBuilder because it has to handle synchronization for thread safety.
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