How is StringBuffer different?

StringBuffer and StringBuilder are both classes in Java used for creating mutable sequences of characters, but they have some key differences:

1. Thread Safety:

   • StringBuffer: It is synchronized, which means it is thread-safe. Multiple threads can safely access a StringBuffer instance without causing data inconsistency.
   • StringBuilder: It is not synchronized, making it faster than StringBuffer in single-threaded scenarios. However, it is not safe to use in a multi-threaded environment without external synchronization.

2. Performance:

   • StringBuffer: Due to its synchronized nature, it has a performance overhead when compared to StringBuilder.
   • StringBuilder: Generally faster because it does not have the overhead of synchronization.

3. Use Cases:

   • StringBuffer: Suitable for applications where multiple threads might access the same string data concurrently.
   • StringBuilder: Preferred in scenarios where thread safety is not a concern, such as in single-threaded applications or when performance is critical.

In summary, choose StringBuffer for thread-safe operations and StringBuilder for better performance in single-threaded contexts. If you have more questions or need examples, let me know!