🧵 Difference Between String, StringBuilder, and StringBuffer in Java

Java offers three classes for working with strings: String, StringBuilder, and StringBuffer. String objects are immutable, meaning their value cannot be changed after creation, leading to inefficiency when modified repeatedly. StringBuilder is mutable, allowing modifications without creating new objects, making it faster for single-threaded applications. StringBuffer is also mutable but thread-safe due to synchronized methods, suitable for multi-threaded environments. Using String for concatenation within loops is inefficient, creating numerous unnecessary objects. StringBuilder's append() method is preferred for efficient string manipulation in single-threaded scenarios. StringBuffer should be chosen when multiple threads might access and modify the same string data. Converting between StringBuilder and String is possible using toString() or the StringBuilder constructor. Choosing the correct class impacts application performance and reliability significantly. Understanding their differences is crucial for writing efficient Java code.