Strings are immutable - that means I should never use += and only StringBuffer?

Question

Strings are immutable, meaning, once they have been created they cannot be changed.

So, does this mean that it would take more memory if you append things with += th

Answer 1

Rule of thumb is simple:

If you are running concatenations in a loop, don't use +=

If you are not running concatenations in a loop, using += simply does not matter. (Unless a performance critical application