本文对比了StringBuffer和StringBuilder的特点。StringBuilder自JDK5.0引入，是非线程安全的，适用于单线程操作字符串场景；而StringBuffer则是线程安全的版本，在多线程环境下使用更合适。
What's the difference between a StringBuffer and StringBuilder?
StringBuffer和StringBuilder的区别
The StringBuilder class was introduced with JDK 5.0. Essentially, a StringBuffer is a thread-safe version of StringBuilder. If you are only adding/removing characters from a single-thread, the StringBuilder implementation will be faster. If you are using multiple threads to add and remove characters, use StringBuffer.
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