What is the main difference between StringBuffer and StringBuilder ?

The main difference between StringBuffer and StringBuilder in Java lies in their approach to thread safety and synchronization. StringBuffer is synchronized, which means it is thread-safe and can be used in multithreaded environments where a string data structure is shared among multiple threads. This synchronization ensures that only one thread can modify the StringBuffer at any given time, thus preventing data inconsistency[1][2][3][4][5][6][7].

On the other hand, StringBuilder is not synchronized, which means it is not thread-safe. This lack of synchronization allows StringBuilder to be more efficient and faster than StringBuffer when performing similar operations, as it does not incur the overhead of acquiring and releasing locks[1][2][3][4][5][6][7].

In summary, the choice between StringBuffer and StringBuilder should be based on the requirements for thread safe...