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This is René Schwietzke's tech blog. Here, I write about interesting Java topics, performance in the context of Java as well as web and service performance, testing and quality assurance, and, last but not least, about IT things in general. Things I want to share because they helped me and might help others.

String

The StringBuilder advice is dead, or isn’t it?

The old advice is not valid anymore

2023-06-23

Since I just read again the advice to always use StringBuilder instead of String concatenation, we will close this chapter once and for all, right now!

Long story short, using StringBuilder instead of String concatenation is just an old myth. In most cases, it is not true anymore. You can safely do a String1 + String2 in your code, and you won’t notice any difference. There are only a few special cases where a StringBuilder is a must.