标准回答 String 是不可变对象，适合读多写少的场景，线程安全性来自不可变性； StringBuilder 可变但线程不安全，性能通常最好，适合单线程下频繁拼接字符串； StringBuffer 也是可变字符串，但很多方法带同步控制，线程安全但性能一般不如 StringBuilder。
This repository follows the S.Y. B.Tech Semester IV curriculum at PICT, categorized into core syllabus requirements and industry-aligned practical scenarios[cite: 1, 3].
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