Question

Possible Duplicate:
java String concatenation
StringBuilder vs String concatenation in toString() in Java

I ve read some articles about append() is much faster than +, but what is the reason ,and why would we use + over append()at all? Thanks!

Answer 1

+ creates new intermediate String ojectss as Strings are immutable in Java where as StringBuffer‘s append() works on the same string and that is why it is considered faster. However, you should use StringBuilder from java 5 on wards as it is said to be faster than StringBuffer as it’s methods are not synchronized like StringBuffer.

This is high level theoritical explanation. For more specific details look at String concatenation: concat() vs "+" operator post.