String vs. StringBuilder

Question

I understand the difference between String and StringBuilder (StringBuilder being mutable) but is there a large performance difference

Answer 1

String concatenation will cost you more. In Java, You can use either StringBuffer or StringBuilder based on your need. If you want a synchronized, and thread safe implementation, go for StringBuffer. This will be faster than the String concatenation.

If you do not need synchronized or Thread safe implementation, go for StringBuilder. This will be faster than String concatenation and also faster than StringBuffer as their is no synchorization overhead.