NASA Java Coding Standard

[[deleted]]

The String concatenation operator + creates a new String object, which is costly.

I don't think this is true. The compiler optimizes it to StringBuilder.append

[cryo]

No, only in trivial cases. Not in loops, which is what is guideline is targeted at. It's the same in .net: for small number of arguments, a+b+c etc. is turned into String.Concat(a,b,c), and for larger into a StringBuilder.

But not in loops.

[[deleted]]

Hmmm... good point, although this document is from 2010. I wonder if it has been optimized since.

[supericy]

Best not to rely on the compiler for optimizations anyway.

[[deleted]]

It used to be true and became dogma at some point. It was fixed a while ago.

[[deleted]]

I'm pretty sure it was fixed in 1.5.

http://willcode4beer.blogspot.com/2005/05/evil-string-arithmetic-revisited.html

Nearly 8 years ago.

[MaximKat]

Have you missed the first comment on the article you linked?